Hemorrhagic diatheses–adapted from Vezeau [15] and Goswami et al. [16].
\r\n\tCarbon Capture and Storage is a technology that can capture up to 90% of the carbon dioxide (CO2) emissions produced from the use of fossil fuels in electricity generation and industrial processes, preventing the carbon dioxide from entering the atmosphere.
\r\n\r\n\tFurthermore, the use of CCS with renewable biomass is one of the few carbon abatement technologies that can be used in a 'carbon-negative' mode – actually taking carbon dioxide out of the atmosphere.
\r\n\r\n\tThe aim of this book is to discuss the end-to-end process of carbon capture with the help of new innovations, green technologies and the concept of triple boom line.
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Becerra Yoma, C. Molina, C. Garreton and F. Huenupan",authors:[null]},{id:"116",title:"The Research of Noise-Robust Speech Recognition Based on Frequency Warping Wavelet",slug:"the_research_of_noise-robust_speech_recognition_based_on_frequency_warping_wavelet",signatures:"Xueying Zhang and Wenjun Meng",authors:[null]},{id:"117",title:"Autocorrelation-based Methods for Noise-Robust Speech Recognition",slug:"autocorrelation-based_methods_for_noise-robust_speech_recognition",signatures:"Gholamreza Farahani, Mohammad Ahadi and Mohammad Mehdi Homayounpour",authors:[null]},{id:"118",title:"Bimodal Emotion Recognition using Speech and Physiological Changes",slug:"bimodal_emotion_recognition_using_speech_and_physiological_changes",signatures:"Jonghwa Kim",authors:[null]},{id:"119",title:"Emotion Estimation in Speech Using a 3D Emotion Space Concept",slug:"emotion_estimation_in_speech_using_a_3d_emotion_space_concept",signatures:"Michael Grimm and Kristian Kroschel",authors:[null]},{id:"120",title:"Linearly Interpolated Hierarchical N-gram Language Models for Speech Recognition Engines",slug:"linearly_interpolated_hierarchical_n-gram_language_models_for_speech_recognition_engines",signatures:"Imed Zitouni and Qiru Zhou",authors:[null]},{id:"121",title:"A Factored Language Model for Prosody Dependent Speech Recognition",slug:"a_factored_language_model_for_prosody_dependent_speech_recognition",signatures:"Ken Chen, Mark A. Hasegawa-Johnson and Jennifer S. Cole",authors:[null]},{id:"122",title:"Early Decision Making in Continuous Speech",slug:"early_decision_making_in_continuous_speech",signatures:"Odette Scharenborg, Louis ten Bosch and Lou Boves",authors:[null]},{id:"123",title:'Analysis and Implementation of an Automated Delimiter of "Quranic" Verses in Audio Files using Speech Recognition Techniques',slug:"analysis_and_implementation_of_an_automated_delimiter_of__quranic__verses_in_audio_files_using_speec",signatures:"Tabbal Hassan, Al-Falou Wassim and Monla Bassem",authors:[null]},{id:"124",title:"An Improved GA Based Modified Dynamic Neural Network for Cantonese-Digit Speech Recognition",slug:"an_improved_ga_based_modified_dynamic_neural_network_for_cantonese-digit_speech_recognition",signatures:"S.H. Ling, F.H.F. Leung, K.F. Leung, H.K. Lam and H.H.C. Iu",authors:[null]},{id:"125",title:"Talking Robot and the Autonomous Acquisition of Vocalization and Singing Skill",slug:"talking_robot_and_the_autonomous_acquisition_of_vocalization_and_singing_skill",signatures:"Hideyuki Sawada",authors:[null]},{id:"126",title:"Conversation System of an Everyday Robot Robovie-IV",slug:"conversation_system_of_an_everyday_robot_robovie-iv",signatures:"Noriaki Mitsunaga, Zenta Miyashita, Takahiro Miyashita, Hiroshi Ishiguro and Norihiro Hagita",authors:[{id:"11981",title:"Prof.",name:"Hiroshi",middleName:null,surname:"Ishiguro",fullName:"Hiroshi Ishiguro",slug:"hiroshi-ishiguro"}]},{id:"127",title:"Sound Localization of Elevation using Pinnae for Auditory Robots",slug:"sound_localization_of_elevation_using_pinnae_for_auditory_robots",signatures:"Tomoko Shimoda, Toru Nakashima, Makoto Kumon, Ryuichi Kohzawa, Ikuro Mizumoto and Zenta Iwai",authors:[null]},{id:"128",title:"Speech Recognition Under Noise Conditions: Compensation Methods",slug:"speech_recognition_under_noise_conditions__compensation_methods",signatures:"Angel de la Torre, Jose C. Segura, Carmen Benitez, Javier Ramirez Luz Garcia and Antonio J. Rubio",authors:[null]}]}]},onlineFirst:{chapter:{type:"chapter",id:"69934",title:"Bleeding in Dental Surgery",doi:"10.5772/intechopen.89992",slug:"bleeding-in-dental-surgery",body:'\nAll surgical procedures, including dental surgery, present risk of complications, which may include pain, nerve injury, swelling, infections, and hemorrhage. Dental surgery is defined as any dental intervention including an incision in the oral mucosa or gingiva, including anything from a simple dental extraction to alveoloplasties [1]. Bleeding control is an important step during dental surgery procedures [2] because excessive bleeding complicates surgery and increases the risk of morbidity. To avoid such complications when long-lasting bleeding occurs, despite the proper use of traditional techniques for hemorrhage control, a broad range of hemostatic agents are available, as adjunctive measures to enhance hemostasis in the course of dental surgeries [3]. Despite the expressive rise in the amount and types of topical hemostats in the past decade, high-level evidence regarding the management of these agents during bleeding in dental surgery is still lacking.
\nThe periprocedual management of patients receiving therapeutic anticoagulation represents a challenge for dental practitioners, as the risk of bleeding must be counterbalanced against the risk of systemic or local thromboembolic phenomena. Recommendations for dental interventions in individuals receiving anticoagulation therapy remain quite unclear, in spite of practice guidelines from both dental [4] and medical [5] fields.
\nThis chapter aims to discuss the effective ways of managing bleeding complications in dental surgery, mainly in high-risk patients. The role of biosurgical materials to prevent or solve these complications, during and after dental surgery procedures, will also be addressed, as well as their modes of action, practical applications, adverse effects, and effectiveness.
\nThe physiological mechanism that prevents and hinders bleeding at the area of an injury while preserving regular blood flow everywhere else in the circulation is called hemostasis [6]. The hemostasis process has two major components. Primary hemostasis initiates promptly after vascular injury, and it can be divided into four consecutive and superposed stages: (A) vasoconstriction, (B) platelet adhesion, (C) platelet activation, and (D) platelet aggregation [7, 8, 9, 10]. Primary hemostasis results in the formation of a platelet plug [10]. Secondary hemostasis comprises a sequence of serine protease zymogens and their cofactors, which interact successively on phospholipid surfaces (damaged endothelial cells or platelets), leading to the development of covalently cross-linked fibrin [10, 11, 12]. This cross-linked fibrin mesh is then incorporated into and around the platelet plug. It strengthens and stabilizes the blood clot. These two processes are intertwined and occur at the same time [6]. These systems are regulated by multiple anticoagulant mechanisms, which are responsible for maintaining blood fluidity in the absence of injury, generating a clot that is consistent with the trauma. Hemostasis and the avoidance of bleeding or thrombosis are directly related to the adequate balance between procoagulant and anticoagulant systems [6].
\nHemorrhage in dental surgery can be categorized as:
Primary hemorrhage: bleeding occurs during surgery
Reactionary hemorrhage: bleeding occurs 2–3 hours after surgery
Secondary hemorrhage: bleeding occurs until 14 days after surgery, probably due to an infection
Hemorrhage can also be categorized according to the area injured: vascular, bone, and soft tissue [13, 14]. Bleeding diathesis is an unusual susceptibility to bleeding and may be genetic, autoimmune, or acquired (Table 1) [15, 17]. Selected bleeding disorders will be covered in this chapter.
\n\nThe most prevalent hereditary bleeding disorders are von Willebrand disease and hemophilia, affecting 1% of the population and 20,000 people in the USA, respectively [18, 19, 20, 21, 22]. Dental patients presenting inherited bleeding present a significantly higher risk of perioperative bleeding. The frequency and severity of bleeding are related to disease-related factors, such as the severity of the hemophilia. Factors related to the patient include the level of periodontal disease, vasculopathy or platelet dysfunction, and procedure-related factors (teeth extracted—type and the number—or the size of the wound area) [23].
\nOne example of autoimmune bleeding diathesis is the immune thrombocytopenic purpura (ITP), an idiopathic thrombocytopenic purpura condition, characterized by isolated thrombocytopenia without a clinically apparent cause [24].
\nThe most common acquired bleeding diathesis is the one related to hemostasis-altering medications. Anticoagulant agents are among the most prescribed medications in the USA [25]. For decades, anticoagulants have been prescribed to prevent arterial and venous thromboembolism [1]. Prolonged bleeding and bruising are some of the adverse events related with these medications [4]. The most frequently used drugs are therapeutic platelet inhibitors, vitamin K antagonists, or direct oral anticoagulants. Patients susceptible to hemorrhage may present severe bleeding resulting from dental surgery procedures. The use of biosurgical hemostatic agents to decrease or control bleeding may be beneficial for patients at risk for bleeding diathesis.
\nBleeding complications can occur either in healthy or systemically compromised patients. Some patients tend to bleed excessively during or after dental surgery, due to different factors, such as anticoagulant therapy, inherited bleeding disorders, uncontrolled hypertension, extreme trauma to soft tissues, and non-compliance to postoperative recommendations. In these cases, the use of an effective hemostatic agent enhances hemostasis, providing a wide spectrum of benefits, such as superior management of the anticoagulated patient, shorter operation time, as well as smaller wound exposure and shorter recovery time.
\nThe ideal topical hemostatic agent should be biocompatible, affordable, and effective [14, 26, 27]. In recent years, the number of different topical hemostatic agents has increased significantly (Table 2). Knowledge and familiarity with the wide range of topical hemostatic agents available are essential for dental practitioners, including their effectiveness, mode of action, and adverse effects. A well-informed professional will be able to opt for the most effective and practical agent for each situation. In relation to the use of local hemostatic in dental procedures, available scientific data is not homogenous. Most publications use one or more local hemostatic agents to compensate for the anticoagulant effect and prevent postoperative bleeding [29]. The most common local biosurgical hemostatic agents used in dentistry and approved by the Food and Drug Administration (FDA) are listed in Table 2.
\nTypes and trade name of some biosurgical agents–adapted from Pereira et al. [28].
Local biosurgical hemostatic agents can be classified into (A) passive or mechanical, (B) active, and (C) flowables [30].
\nConsidered as the most effective agents for small amounts of bleeding, passive or mechanical agents provide platelet activation and aggregation. This results in a matrix formation in the bleeding area that works as a barrier to stop bleeding, by activating the extrinsic clotting pathway and providing a surface that will allow coagulation to occur faster [30]. As these agents are biologically inactive, they rely on the individual’s own fibrin production to attain hemostasis. Passive hemostats are only indicated for individuals with an unscathed coagulation cascade [27]. They are generally applied as frontline agents, since they are readily available, do not require special storage or handling, and are relatively affordable [14, 27, 31].
\nGelatin is a hydrocolloid derived from acid partial hydrolysis of purified animal collagen. It is presented as a gelatin sponge, powder (mixed to form a paste), or film. Gelatin can be placed dry or after moistening it with saline [14, 28, 32, 33]. Gelatin-based products adapt effortlessly to wounds making it appropriate for application into irregular surfaces [27]. Although their mode of action is not completely understood, gelatin-based products likely act more physically than chemically in the coagulation cascade [28, 34]. Affordability, ease of use and good hemostatic activity make topical hemostats with gelatin matrix a popular tool for reducing the morbidity caused by hemorrhage [27, 28] after dental extractions and periodontal surgeries.
\nThe most popular absorbable gelatin sponge in dentistry is Gelfoam®. It is a hemostatic compressed sponge obtained from purified porcine skin gelatin. Gelfoam® is capable of absorbing many times its weight of whole blood [35]. Generally, when applied in soft tissues, its complete absorption occurs within 4–6 weeks.
\nCollagen absorbable products are nontoxic and non-pyrogenic. They are sourced from either bovine dermal collagen or bovine tendon. Collagen hemostats provide a matrix for clot formation and consolidation. These products also improve clotting factor release and platelet aggregation and degranulation, thereby breaking up clot formation. Their presentation in sheets and flours allows for easy adaptation and adhesion to irregular surfaces. Although they are commercialized at a higher price than gelatin-based hemostats, hemostasis can usually be accomplished relatively quicker (1–5 min). Collagen absorbable products are easily removed, reducing the risks of rebleeding and the need for various applications. They are absorbed in 8–10 weeks if remained in place. Adverse effects linked to bovine collagen products might include swelling and allergic reaction [30].
\nHelistat® is a collagen-based product originated from purified and freeze-dried bovine flexor tendon and is available as a spongelike structure [14, 27]. Helistat® can hold many times its own weight of fluid, as it is highly absorbent. Collagen induces platelet agglomeration when in contact with blood. In order to achieve hemostasis, Helistat® must be kept at the site (approximately 2–5 minutes). Subsequently, it can be removed, replaced, or left in place. It is easily manipulated, and it must be handled dry, and any excess must be removed. Complete reabsorption occurs within 14–56 days [14, 27, 36]. Helistat® may foster bacterial growth, acting as a nidus for abscess formation [14, 27, 37]; therefore, it should not be placed in wounds with any kind of contamination or infection. Possible adverse reactions of Helistat® or similar products are allergic reaction, foreign body reaction, and adhesion formation [27, 38].
\nSimple oxidized cellulose was first introduced in the early 1940s in the USA. In the 1960s, a new topical hemostatic-oxidized regenerated cellulose (ORC) was launched as a meshwork made from treated and sterilized cellulose—Surgicel®. ORC products are originated from vegetal-based alpha cellulose, available in absorbable knitted fabrics (low or high density), and prepared as sterile fabric meshworks. They are ready-to-use products that may be kept at room temperature and absorb 7–10 times its own weight [27, 30]. ORC cause contact activation and platelet activation, and, when absorbed, a gelatinous mass is created, assisting in the establishment of the clot formation [30]. Thrombin is ineffective with these agents due to low-pH factors. ORC are utilized in the management of capillary, venous, and small arterial bleeding, and they require dry application, without addition of saline or thrombin [27, 39] and are absorbed within 4–8 weeks, depending on the volume applied, the tissue bed, and the magnitude of blood saturation [27, 40, 41, 42]. To prevent delayed healing, excessive volumes should be removed [27]. ORC should not be used in osseous defects as it may intervene with bone regeneration [14, 27, 31]. Adverse effects also include reactions related to the acidic nature of ORC. This characteristic may induce necrosis and inflammation of the surrounding tissue and makes thrombin inefficient with these agents. When left in the wound, they may lead to fluid encapsulation and foreign body reaction [14, 27].
\nThe most common commercial products in this category are Surgicel®, Oxycel®, and Surgicel Nu-Knit®. Surgicel® and Surgicel Nu-Knit® come in knit, solid fiber form, whereas Oxycel® comes in knit, hollow fiber form; however, they function basically in a similar manner [30].
\nOxidized cellulose (OC) agents are produced from sterilized and treated cellulose, presented as a meshwork. In the presence of blood, they present a three- to fourfold increase in volume and are converted into gel. OC dissolve completely in 1–2 weeks into biodegradable end products glucose and water, and they do not interfere with wound healing [14, 27].
\nActCel® binds to calcium ions, resulting in more calcium available for the coagulation cascade [14, 27, 37]. Biochemically, it intensifies the coagulation process by increasing platelet aggregation and physically by 3D clot stabilization. ActCel® is especially indicated in third molar extractions, to avoid the occurrence of dry sockets, and in orthognathic and periodontal surgeries [27]. ActCel® is hypoallergenic, as it does not contain collagen, thrombin, or chemical additives. It also has important bacteriostatic properties [27, 43], which are particularity relevant in infected wounds [27].
\nGelita-Cel® is a relatively quick acting, oxidized resorbable cellulose hemostatic gauze of natural origin. It presents a decreased risk for encapsulation, as it resorbs as fast as 96 hours [14, 27, 37].
\nPolysaccharide hemospheres are a fairly new class of topical biosurgical hemostatic agents, produced from vegetable starch, and they contain no animal or human elements. They are commercially presented in powder form. Polysaccharide hemospheres increase barrier formation by creating a hydrophilic effect, dehydrating the blood, and concentrating its solid components [14, 27]. Due to their 3D scaffold, they are devised to enhance clot formation and organization, even in the absence of intrinsic coagulation activity [14, 44, 45]. Polysaccharide hemospheres should be used with caution in diabetic patients, as they consist of sugars [27].
\nArista™AH is the only FDA-approved product in the polysaccharide hemosphere category. It is used in dental surgery as an adjunctive hemostatic agent, when conventional mechanical procedures, such as pressure and ligature, are not effective or practical.
\nHemostatic adhesives are often used as adjuncts to standard hemostatic procedures to control bleeding from surgical areas [30]. One of the most well-known products in this category is BioGlue®. It consists of a solution of 10% glutaraldehyde and 45% bovine albumin solution purified by precipitation, heat, and chromatography radiation [28, 46]. BioGlue® has been extensively used for its sealants and hemostatic characteristics. The risk of leaking through the suture tracks is the main disadvantage of BiolGue® [27]. In the search for newly created adhesives with the chemical features and the safe reabsorptive profile required to benefit dental surgery patients, several clinical trials are currently in process.
\nActive hemostatic agents are biologically active, as they play a direct role in the coagulation cascade, inducing the formation of a fibrin clot [26, 27].
\nThrombin is key to hemostasis, as well as to the inflammatory and cell signaling processes. It is the base of the fibrin clot, fostering the transformation of fibrinogen to fibrin [28]. Topical thrombin hemostats are originated from either bovine or human plasma, and they can also be produced through recombinant DNA techniques [14, 27]. In the past, the only thrombin hemostat available was composed of bovine plasma (Thrombin-JMI). Although it has proven to be efficient in terminating bleeding, bovine thrombin induces an important immune response [28, 47]. Individuals on hemodialysis, with increased levels of antibodies against topical bovine thrombin, had higher incidence of vascular access thrombosis, severe coagulopathy, and bleeding after exposure to bovine thrombin [28, 48]. As an attempt to avoid these hazardous effects, thrombin derived from human plasma (Evithrom®) and recombinant human thrombin (Recothrom®) were developed. In 2010, Browman et al. [49] demonstrated, in a comparative study between recombinant human thrombin and bovine thrombin, that human recombinant thrombin showed the same efficacy in surgical hemostasis, a comparable safety profile, and a remarkably lower immune response than bovine thrombin. Thrombin may be applied topically, as a solution combined with gelatin sponges mixed with a gelatin matrix, as a dry powder, or as a spray [14, 27]. It is commonly used in conjunction with Gelfoam® to stop moderate to severe bleeding.
\nFibrin sealant or fibrin glue originates from bovine and/or human blood components and simulates the last phases of the coagulation cascade, generating a fibrin clot [30]. These agents control local, as well as diffuse, bleeding from the surgical area. Nevertheless, they are ineffective in controlling intense bleeding. Its use in dentistry includes tooth extraction sites, bone grafting, and periodontal surgery [14].
\nTisseel® was the first fibrin sealant approved by the FDA. It has in its composition human thrombin and fibrinogen, intermixed with aprotinin and CaCl2. Because aprotinin is a bovine protein, it is a potential allergen. Multiple exposures may cause allergic reactions, as well as anaphylactic reaction approaching lethality [30, 50]. As for its ideal application, a dry operating field is required; Tisseel® is particularly effective when applied prior to bleeding. In this situation, fibrinogen may polymerize before blood pressure increases local microcirculation flow. When used after the onset of bleeding, one should apply local pressure over the wound to allow polymerization [28, 51]. Tisseel® is available in a pre-filled syringe, allowing for effective application using the EasySpray and DuploSpray MIS systems.
\nAnother option for fibrin sealants, Evicel®, originates from pooled human plasma. It is available as two separate vials of fibrinogen and human thrombin. Prior to use, the two deep frozen solutions must be thawed and mixed after defrosting and heating up (20–30°C) [30].
\nCrosseal™ is a virally inactivated, second-generation surgical sealant. It is produced from concentrated human clottable proteins, namely, biological active component (BAC), which contains the active component fibrinogen, and human α-thrombin (1000 IU/ml) [52]. This fibrin sealant is applied using an application device which drips/sprays Crosseal™ onto the bleeding site.
\nThere are two main categories of flowable biosurgicals: products containing porcine gelatin, which can be combined with thrombins (bovine, human-pooled plasma thrombin, or rhThrombin), and bovine collagen-based agents, packed with human-pooled plasma thrombin. The flowable agents are deemed the most effective of all the local hemostatic agents [30, 53].
\nSurgiflo® is an absorbable, sterile, hemostatic porcine gelatin matrix, combined with Thrombin-JMI, a topical bovine-derived thrombin. It should be placed directly to the bleeding areas to activate the hemostatic process [30]. A compression period is required for polymerization of the sealant components [28].
\nFloseal® consists of a bovine gelatin matrix, plasma-extracted human thrombin, and CaCl2. Its gelatin granules expand (10–20%), as it comes in contact with blood, producing a seal when the product is applied to a bleeding area [27, 30]. The thrombin fraction of the product triggers the regular pathway of the coagulation cascade, converting fibrinogen to a fibrin polymer and creating a clot around the firm matrix [27], which is reabsorbed within the expected period of standard wound healing (6–8 weeks) [14, 27, 33, 42, 54]. A distinctive feature of Floseal® is the need for the presence of blood for activation [30, 55]. Neither compression, nor a dry surgical field is required for its application [28].
\nBecause of this biosurgical flowability, they can easily adapt to irregular wounds. Flowables have been utilized as frontline topical hemostats in major dental surgeries, in patients where conventional procedures are ineffective. They can be utilized as an adjunct to hemostasis in practically all dental surgical interventions. Flowables are effective on both hard and soft tissues [27, 30]. They have a risk of transmitting infectious agents and are contraindicated in patients who are allergic to materials of bovine origin [27].
\nAlthough traditional methods, such as ligature and manual pressure, can promote hemostasis, they are not an effective approach of bleeding control in less accessible sites and complex injuries. Furthermore, bleeding control is especially challenging in patients presenting acquired or congenital coagulation disorders.
\nTopical biosurgical hemostatic agents comprise a wide range of products aiming at minimizing the risk of bleeding. In recent years, several clinical trials have analyzed the effectiveness, advantages, and limitations of biosurgicals, as well as performed comparisons among the different types of biosurgicals and other non-biologic agents. Despite the beneficial effect of these local hemostatic agents in preventing bleeding in dental surgery, available data comparing their effectiveness and efficiency is still scarce and inconclusive. Methodological heterogeneities, such as the lack of a standard therapy and comparable treatment regimens, are noticeable among studies, as well as the reduced number of randomized controlled trials [2, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70].
\nIn summary, local hemostatic agents are very distinct products with diverse indications. Presently, there is no definite evidence-based approach to guide the dental practitioner when selecting a local hemostatic agent. They must be aware of the characteristics of each single hemostatic agent, to elect the most suitable product for every particular clinical situation. In addition, current available data shows that no topical agent can be regarded as superior or more effective than the others [2]. Further experimental research and controlled clinical trials are warranted to define the most cost-effective biosurgical hemostatic agents in dentistry.
\nThe dental practitioner should assess the bleeding risk of the patient, as well as the bleeding risk of the surgical intervention, preoperatively. After assessing both bleeding risks, the professional can then conceive an intraoperative and postoperative plan. The international normalized ratio (INR) must be evaluated in patients reporting an elevated risk of bleeding. While a standard parameter of coagulation has an INR of 1 [71], the therapeutic range runs from 2.0 to 3.5. In this case, it is recommended to use local hemostatic measures independently or in combination with conventional methods. These agents can be used before, during, and after dental surgeries.
\n\n
Comprehensive medical history, including all medications in the patient’s regimen, to identify potential bleeding issues prior to the surgery [26].
In order to decrease surgical bleeding, patients receiving anticoagulant therapy may need to break up exodontia into multiple appointments [26, 72].
Laboratory values such as platelet count, INR, and prothrombin time are of critical value in medically compromised patients [26].
Demographic risk factors (female sex and older age) [73].
Supplemental patient-related risk determinants: diabetes mellitus, hypertension, obesity, hemostatic disorders, renal impairment, and other major organ system failures [73, 74, 75].
Timing of the appointment: early morning visits allowing patients to return to the dental office in case of postsurgical hemorrhage [26].
Patients at a higher bleeding risk are those reporting family history of bleeding and previous bleeding problems after dental surgery or trauma and individuals using medications, such as aspirin, anticoagulants, and/or long-term antibiotics. Any illnesses associated with bleeding problems, such as leukemia, congenital heart disease, liver disease, or hemophilia, present a higher risk of bleeding. The dental professional needs to be aware and prepared for any intercurrence, during or after a surgical procedure. Individuals presenting advanced periodontal disease are also considered as having a higher risk of perioperative bleeding. In such cases, the surgical plan should include a preoperative phase, consisting of scaling and root planning and a proper chlorhexidine gluconate mouth rinse regimen, 2 weeks before an elective procedure [26].
\nThe risk of bleeding of a dental intervention may be ranked as high, moderate, and low [25, 76, 77, 78]. In most patients, antithrombotic therapy is not interrupted before dental interventions with low bleeding risk, due to the disastrous complications of thrombosis (Table 3) [25, 76, 77, 78]. Moderate and high bleeding potential interventions might need the temporary discontinuation of the antithrombotic therapy [25, 76, 77, 78].
\nDental interventions that do not require anticoagulation therapy interruption*–adapted from Kaplovitch and Dounaevskaia [25].
Dental surgical interventions are considered by most recommendations, as minor procedures presenting self-limited blood loss and low bleeding risk. Bleeding, in most cases, can be managed with local hemostatic agents [79, 80].
\nThe dental care of individuals receiving therapeutic anticoagulation becomes critical when invasive procedures are needed. At this time, the clinician must decide either to maintain the anticoagulation therapy and risk bleeding complications or withdraw the anticoagulation medication and risk developing systemic thrombosis [1]. After decades of controversial data, there is currently a nearly unanimous consensus that anticoagulation therapy, for most dental surgeries, should not be discontinued. The higher risk of bleeding complications is compensated by the elevated risk of developing thromboembolic complications [1, 81, 82, 83, 84].
\nNational dental and medical group statements and multiple evidence-based clinical guidelines have considered the issue independently and support the maintenance, for most dental patients, of anticoagulation therapy (American Dental Association; American Academy of Dental Sleep Medicine; American Heart Association; American College of Cardiology; American Academy of Neurology; American Society of Anesthesiologists; Society for Neuroscience in Anesthesiology and Critical Care; American College of Chest Physicians (ACCP)) [1]. In a 2012 statement [76], the ACCP recommended continuing anticoagulation therapy with warfarin, with the additional utilization of a local hemostatic. The ACCP advised a 2–3-day anticoagulation therapy suspension, in order to lower the INR levels to a range of 1.6 and 1.9 [76, 85].
\nLately, the dental care of patients receiving anticoagulant treatment has been the focus of expressive scientific interest, in both dental and medical fields. A recent literature review showed that only 31 (0.6%) of more than 5400 patients receiving over 11,300 dental surgical interventions while continuing to take vitamin K antagonist anticoagulants (warfarin in most cases) demanded more than local maneuvers for hemostasis. No cases of fatal hemorrhage were reported. In over 2600 individuals whose anticoagulation was discontinued for dental interventions, 22 thromboembolic complications (0.8% of medication withheld), including 6 fatal events (0.2% of medication withheld), were observed [83]. Similar results have been shown in a literature review of dental surgery and antiplatelet medications. Of more than 1200 patients receiving over 2300 dental surgical procedures while continuing their antiplatelet medications (aspirin in most cases), only 2 (0.2%) needed more than local measures for hemostasis. Conversely, in over 320 individuals undergoing 370 antiplatelet interruptions for dental procedures, 17 (5.3%) suffered thromboembolic complications [86].
\nAvailable data shows that the majority of dental interventions can be safely conducted in patients receiving anticoagulation treatment, when considering older medications [4]. However, there are fewer studies reporting the provision of dental care in individuals using newer direct oral anticoagulants. The clinical implications of these newer anticoagulant and antiplatelet therapies have only been recently investigated [80, 87]. The protocol followed by the dental practitioner when managing these patients varies significantly and shows inconsistencies reflecting the lack of large-scale studies and evidence-based clinical guidelines [80, 88, 89]. The risk of postoperative bleeding after invasive periodontal treatment in individuals using different anticoagulation therapies was assessed, retrospectively, in 456 individuals receiving an antiplatelet and/or anticoagulant therapy [90]. Data was collected after 484 invasive periodontal interventions, with 99.6% of patients continuing their medications during the procedures. Postoperative bleeding was reported only following three interventions (0.35%), and it was controlled with local hemostatic maneuvers. Although the authors did not specify which type of local hemostatic procedure was used, this retrospective study showed a very low risk of bleeding in patients receiving an invasive periodontal intervention while using an anticoagulant or antiplatelet medication [90]. These results support the recommendation that such medications do not need to be discontinued in anticipation to invasive periodontal interventions.
\nExtended inter- or postoperative bleeding following dental surgery is infrequent, seldom demanding anything more than the use of local hemostatic biosurgicals. The judgment of whether or not to interrupt anticoagulation treatment can be both intricate and dynamic, and it should be based on the indication for pharmacological therapy, as well as previous thromboembolic history. The discontinuation of anticoagulant therapy may be required in dental interventions with moderate and high bleeding risk [25, 76, 77, 78]. Currently, most clinicians dealing with anticoagulant management tend to personalize the periprocedural management of the bleeding potential, according to the individual risk of each procedure—low, moderate, or high—following the current clinical practice recommendations based on best evidence and maintaining the anticoagulant therapy. Thereby, the patient anticoagulant regimen should be continued in specific low-risk dental procedures, without consultation or fear of disproportionate bleeding demanding additional intervention (Table 3) [25].
\nUndoubtedly, anticoagulant agents are effective in preventing thromboembolism. Nevertheless, their potential for critical adverse effects cannot be ignored. The use of antithrombotic medications is the most frequent cause of an adverse drug event requiring individuals to seek out emergency care [25, 91]. The majority of drug interactions with anticoagulants lead to elevated risk of bleeding. The nature of the interactions cannot be predicted, as they are expressed through both pharmacodynamic mechanisms and pharmacokinetic properties [25].
\nRegarding patient safety, potential risk for interaction, as well as knowledge of appropriate prescribing and monitoring, is crucial. Equally decisive is selecting the appropriate anticoagulant agent and monitoring the potential for drug–drug interaction [10, 11, 12, 13, 14, 15, 17, 25]. Common anticoagulants and their interaction with the most common medications prescribed for dental patients are described in Table 4 [25, 92, 93, 94, 95, 96, 97, 98].
\nCommon anticoagulants and potential interactions with dental medications–adapted from Kaplovitch and Dounaevskaia [25].
Most studies evaluating the occurrence of peri- and postoperative bleeding show anticoagulation therapy can be maintained when adequate local hemostatic maneuvers are used.
\nAs an example, a controlled clinical trial compared the occurrence of bleeding following dental extractions in individuals receiving oral anticoagulants (experimental group) versus patients that had never received oral anticoagulant therapy (control group). Tooth extractions were performed, and a piece of oxidized cellulose was placed only into the sockets in the experimental group. The wound borders were sutured, and a gauze saturated with tranexamic for 30–60 minutes was applied with pressure in the wound. Both groups presented similar bleeding complications [99]. In a similar clinical trial [100], 161 tooth extractions were performed in patients undertaking warfarin. After tooth extraction, an oxidized cellulose gauze was placed in the socket, and the wound was sutured. Patients were assigned to four groups, according to their INR range (INR was 1.5–1.99 in group 1; 2.0–2.49 in group 2; 2.5–2.99 in group 3; and 3.0–3.7 in group 4). No significant differences were found in the postoperative bleeding among groups.
\nBased on the latest evidence and clinical practice recommendations on the perioperative management of dental patients receiving direct oral anticoagulants, on single or dual antiplatelet therapy or vitamin K antagonists, as well as on the current scientific knowledge on biosurgical hemostatic agents, the following conclusions can be made:
The majority of dental procedures can be securely executed without the withholding of anticoagulants, using only local hemostatic therapy. In fact, current recommendations and consensus support the continuation of antiplatelet or anticoagulant therapy. Discontinuing these drugs can increase the risk of thromboembolism, at the cost of minor bleeding, which can be restrained without difficulty. The appropriate use of local hemostatic measures, such as topical biosurgical hemostatic agents, should always be considered whenever indicated.
In order to safely treat a patient receiving anticoagulant therapy, familiarity with anticoagulants and with the potential for drug–drug interactions is required, in addition to knowledge about the topical hemostatic options available.
Topical biosurgical hemostatic agents are diverse agents with distinct indications. The dental practitioner must be aware of the properties of each single agent, in order to properly select the product needed in each different clinical condition.
Based on current available data, no topical hemostatic agent can be regarded as superior or more effective than the others. Further experimental research and controlled clinical trials are warranted to define the most cost-effective biosurgical hemostatic agents in dentistry.
A definite protocol for excessive bleeding is still required for dental surgery in patients with hemorrhagic diathesis. The most effective local hemostatic agent with lesser complications should be determined in future research, considering their availability and cost-effectiveness.
The authors are grateful to Kisa Iqbal BSc Hons, DDS Candidate c/o 2020, New York University College of Dentistry, for editing this article.
\nThe authors declare no conflict of interest.
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