Course Number: 170 Immediate Dental Implant Placement: Technique, Part 2 Authored by John Cavallaro, DDS, and Gary Greenstein, DDS, MS Upon successful completion of this CE activity 2 CE credit hours may be awarded A Peer-Reviewed CE Activity by Dentistry Today, Inc, is an ADA CERP Recognized Provider. ADA CERP is a service of the American Dental Association to assist dental professionals in indentifying quality providers of continuing dental education. ADA CERP does not approve or endorse individual courses or instructors, nor does it imply acceptance of credit hours by boards of dentistry. Concerns or complaints about a CE provider may be directed to the provider or to ADA CERP at ada.org/goto/cerp. Approved PACE Program Provider FAGD/MAGD Credit Approval does not imply acceptance by a state or provincial board of dentistry or AGD endorsement. June 1, 2012 to May 31, 2015 AGD PACE approval number: 309062 Opinions expressed by CE authors are their own and may not reflect those of Dentistry Today. Mention of specific product names does not infer endorsement by Dentistry Today. Information contained in CE articles and courses is not a substitute for sound clinical judgment and accepted standards of care. Participants are urged to contact their state dental boards for continuing education requirements.
Immediate Dental Implant Placement: Technique, Part 2 Effective Date: 2/1/2014 Expiration Date: 2/1/2017 LEARNING OBJECTIVES After participating in this CE activity, the individual will learn: Indications and contraindications for immediate implant placement. Technique variations that are employed when placing immediate implants in different areas of the mouth. ABOUT THE AUTHORS Dr. Cavallaro is a clinical associate professor of prosthodontics at the College of Dental Medicine, Columbia University, NY, He maintains a private practice in surgical implantology and prosthodontics in Brooklyn, NY. He can be reached via e-mail at the ad dress docsamurai@si.rr.com. Disclosure: Dr. Cavallaro reports no disclosures. Dr. Greenstein is a professor in the depart ment of periodontology at the College of Dental Med icine, Columbia University, New York, NY. He maintains a private practice in surgical implantology and periodontics in Freehold, NJ. He can be reached at ggperio@aol.com. Disclosure: Dr. Greenstein reports no disclosures. INTRODUCTION Immediate dental implant placement, whereby the implant is inserted directly after a tooth is extracted, has gained widespread acceptance based on a high survival rate. 1,2 However, placement of immediate implants in different regions of the mouth and under diverse conditions can be challenging. Part one of this 2-part article addressed important clinical issues relevant to immediate implants. Part 2 provides practical clinical information for positioning immediate implants in different sections of the mouth, with a focus on Type 1 extraction sockets. POSITIONING IMMEDIATE IMPLANTS BY REGIONS OF THE MOUTH Jumping Distance The jumping distance is a term that refers to the gap between an immediately placed implant and the bone s ability to bridge the gap. 3 Usually, if the gap is less than 2.0 mm, it will fill with bone without bone grafting. 4,5-7 Others suggest that an even greater distance can heal without any osseous augmentation. 8,9 Maxillary Anterior Teeth An osteotomy is created on the palatal aspect of the socket (Figures 1a to 1e). It is advisable to take a side cutting (Lindemann) drill and create a ledge in the palatal bone two thirds the distance from the crest of bone to the apex. This ledge is used as a purchase point to place twist drills. It may be useful to enter the bone at an angle with a twist drill and then straighten it up as the osteotomy is created. Ideally, the implant will be positioned so that incisal edges of the mandibular teeth are aiming at the cingulum of the future anterior restoration. Maxillary teeth protrude at about 110 ; thus it is necessary to drill the osteotomy in a manner that positions the implant to restore the desired tooth position and contour. It is advisable to keep the implant slightly lingual in the socket and it should not touch the buccal plate of bone. The horizontal biologic influence of the implant should be respected to avoid inducing buccal alveolar bone loss. 10 As previously indicated, implants should be placed one mm subcrestally as viewed from the labial osseous crest. In addition, to avoid an implant being pushed buccally upon insertion, it is a good idea to reshape (remove) a small amount of palatal bone at the crest prior to implant placement. Maxillary Bicuspids In the first bicuspid site, if the furcation bone interferes with selecting an ideal osteotomy location, it should be removed. If the furcation bone is thick, then the osteotomy can be initiated there. Usually, the buccal socket of a 2-rooted bicuspid is not a good location for an implant. It is too far to the buccal, and often there is a labial concavity of the alveolus. Thus, this location should be avoided because it will provide poor esthetics, and drilling an osteotomy in this site can result in labial plate perforation. The osteotomy should be drilled relatively 1
straight and the implant should be directed at the buccal aspect of the lingual cusp of the opposing arch. Occasionally, the palatal root of a 2-rooted premolar is in a favorable location (relative to adjacent teeth) to be used as a site for osteotomy preparation and implant insertion (Figures 2a to 2c). The clinician must recall that as the position (mesiodistal and buccolingual location that the im - plant s platform occupies within the bone) deviates from the center of the tooth to be restored, then additional sink depth to provide for running room to create a proper emergence profile of the restoration must be created. Maxillary Molars The osteotomy should be drilled in the furcation bone, and when inserted, the implant may be totally or partially surrounded by bone. As long as primary stability is attained, the socket will fill with bone and the implant will integrate circumferentially. Sometimes it is necessary to use a large-diameter implant to a Continuing Education Figure 1a. Occlusal view of an extraction socket (No. 9). The root has been removed atraumatically without damage to the labial bony plate. c Figure 1c. Clinical view of implant seated within prepared osteotomy with adequate sink depth (approximately 3 mm apical to the labial aspect of the free gingival margin of the adjacent teeth) to provide a proper emergence contour of the provisional restoration. d b Figure 1d. Clinical occlusal view of graft material placed around a healing abutment. It provides support for the labial soft tissue. Figure 1b. Cone beam (CB) cross-sectional view of site No. 9. Note the appropriate entry point for the osteotomy (yellow arrow). attain mechanical retention against the buccal palatal or mesial distal aspects of the alveolus. Other times, the furcation bone is not adequate in subantral height for a dental implant, and a transcrestal sinus floor elevation needs to be performed. In unusual situations when there is minimal bone, e Figure 1e. The healing abutment has been removed and a contoured provisional crown has been placed (out of occlusion). a b c Figure 2a. Clinical occlusal view of the socket of a maxillary premolar (No. 12) immediately postextraction. The palatal socket is within the confines of the lingual surfaces of the adjacent teeth. Figure 2b. The implant is inserted into the palatal socket of tooth No. 12. Figure 2c. Labial view of restored tooth No. 12 at 3 years post-restoration. 2
but the palatal root alveolus is adequate in height to retain an implant, it can be used. How ever, caution must be exercised not to perforate through the alveolus. If the palatal root is used, tilt the im plant to the center of the osteotomy. Furthermore, if the palatal root is too far lingual, it should not be employed because it will create poor positioning of the implant and result in an unsatisfactory prosthesis. Keep in mind that the alveolar bone in a healthy situation is 2 mm apical to the cementoenamel junction (CEJ). Therefore, it is probable that the furcation bone is apical to the buccal and lingual osseous crest. This usually does not present a problem be cause the buccal and palatal walls resorb to a small degree. However, if the walls are very thin, they may resorb several millimeters. If the furcation bone is many millimeters apical to the buccal and lingual crests of bone, the implant platform can be placed several millimeters supracrestally with respect to the level of the furcation bone. Mandibular Incisors The osteotomy can be drilled straight down the alveolus and the implant should tilt toward the cingulum of the maxillary opposing tooth. Alternately, the cingula of the adjacent teeth can provide a visual cue, or surgical guides can be employed. Note that due to the shape of the mandible in the incisor area, despite loss of bone around the roots of teeth, the mandibular bone actually becomes thicker toward the buccal as drilling proceeds apically (Figures 3a to 3d). a b c Mandibular Bicuspids The length of immediate implants needs to be carefully assessed due to the location of the mental foramen. It is coronal to the apex of the first and second bicuspids, respectively, 38% and 25% of the time. Therefore, it cannot be assumed that an implant can be placed that is as long as a bicuspid root. 11 Mandibular Molars After a man dibular molar is extracted, an im plant can be placed in the furcation bone. Usually, the bone is not thick enough to encompass the implant circumferentially. Often only the buccal and lingual aspect of the furcation bone stabilizes the implant. Alternately, the implant can also be placed into the mesial or distal alveolus, but the implant should be directed to the center of the edentate area and aimed at the buccal aspect of the lingual maxillary cusp. Similar to maxillary molar implants, when the implant is placed into the furcation bone, it may be several millimeters apical to the buccal and lingual osseous crest. The gaps around the implant can be allowed to fill with a clot or the areas can be bone grafted. When furcation bone is not available to provide primary stability, there are im plants that are referred to as rescue implants that are very wide and can be used in the man - dibular alveolus (Figure 4). These implants achieve primary stability by engaging the buccal and lingual plates of bone. As always, implant placement must be restoratively appropriate, or a de layed protocol should be used. d Figure 3a. CB cross section of planned immediate implant in the mandibular lateral incisor position. Note that the abutment tool depicts the trajectory of the implant passing through the cingulum area of the existing tooth. Figure 3b. Clinical view of 2 implants placed into the fresh extraction sockets of Nos. 23 and 26. They are inserted slightly to the lingual of center buccolingually, but within the confines of the cingula of the adjacent teeth. Figure 3c. Definitive PFM restoration Nos. 23 to 26. Figure 3d. Periapical radiographs of the definitive prosthesis (Nos. 23 to 26) supported by immediately placed, immediately restored implants at 5 years after completion (nonocclusally loaded immediate provisionalization). Note excellent bone levels. 3
ISSUES RELEVANT TO IMPLANT PLACEMENT Bone Grafting Various graft materials including autogenous bone, de min - eralized freeze dried bone, and hydroxyapatite have been used in gaps around immediately placed dental implants with and without barriers, and have achieved defect resolution. 12 At present there is no one graft material that appears to be superior to all others. If a biomaterial is placed in the gap, some collagen material (eg, CollaCote [Zimmer Dental]) can be placed on top of the material to inhibit exfoliation of the material before a fibrin clot forms. As indicated, gaps < 2 mm heal spontaneously without graft material. Deproteinated bovine bone mineral (DBBM) is the most commonly used bio filler in recent studies, and it was employed alone and in conjunction with resorbable and nonresorbable barriers. 2 However, a possible explanation for the high use of DBBM is that in Europe, human allograft material is not allowed to be used in humans. Additionally, a biomaterial may be placed to preserve soft-tissue contour even if it provides no enhancement to osseointegration of the implant. Prior Position of Roots May Be Poor Guide for Implant Placement If possible, implants should be placed in their ideal locations to enhance prosthetic reconstructions. Pertinent ly, if roots of extracted teeth are not in the best position for a future prosthesis, the root socket should not be used as a guide to create oste otomies. If using the socket as a guide will create a nonoptimally positioned implant, either start a new osteotomy or use a side cutting drill to extend the root socket to the correct position for implant placement. Technique for Placing Implants When Dilacerated Roots Are Present If dilacerated roots are present, it is difficult to initiate an osteotomy along a sloping bony wall. Instead, take a pilot drill and approach the socket in the appropriate place (often just prior to the dilacerations) at a 90 angle. Enter the bone and then create a purchase point for subsequent drills. Immediate Placement if There Is a High Smile-Line In the esthetic zone, if there is a high smile-line, immediate placement should only be attempted if the following criteria Figure 4. Wide body dental implant immediately placed into the socket of a mandibular first molar (No. 30). The implant engages the buccal and lingual cortical plates and achieves primary stability even though there are remaining gaps mesially and distally. are present: periodontal health, no recession, thick biotype, keratinized gingiva, and an intact buccal bony plate of bone. The most critical facet is the buccal plate of bone. The CEJ is normally 2 mm apical to the gingival margin. If the bone is 3 or 4 mm from the gingival margin, it increases the risk of potential recession. Immediate placement when there is a defective bony plate runs the possible complication of recession that may expose implant threads. Concerns About Recession Extrusion of Teeth If a tooth needs to be removed and replaced with an immediate implant, consideration needs to be given to the amount of soft-tissue recession and bone loss that occurred. In this regard, a hopeless tooth may not be a useless tooth. It can be used via orthodontic extrusion to help correct soft- and hard-tissue deformities. Orthodontic extrusion can coronally advance the tissue approximately one mm per month. 13,14 If there is 3 mm or more of recession, consider orthodontic extrusion. Biotype Lee et al 15 concluded that a thin biotype predisposes individuals to recession and loss of papillae. In this regard, Kan et al 16 reported that a thin biotype (probe is visible when placed in the sulcus) in the esthetic zone demonstrates 0.7 mm more recession post-healing than a thick biotype (probe not visible when placed in the sulcus) after implant placement. In the esthetic zone, if the biotype is thin, place the implant more palatally and a little more apically. Recession at Implant Site If it is noticed that the buccal gingiva is several millimeters more apical than the gingival margin of adjacent teeth, there are several techniques that can be used to augment the gingiva at the time of immediate implant placement: (1) place a short healing abutment on the implant and advance the flap to cover the abutment, and (2) place a cover screw in the implant and cover it with a 4
Table. Conclusions and Guidelines for Treating the Buccal Gap After Immediate Implant Placement 20-30 1. Avoid elevating a labial flap when placing implants in the esthetic zone, thus decreasing the risk of recession. 20-23 Raise a lingual flap if additional access for visualization is needed. 2. Gaps < 2 mm wide will usually heal spontaneously without placing a biomaterial. 24 If a biomaterial is inserted in the gap which is less than 2 mm, the data indicate that there will be crestal bone loss, but the horizontal width (contour) will be maintained better. 25-27 In the esthetic zone, it may be advantageous to graft the buccal gap; at a minimum it will help support the soft tissue. 3. It has been suggested that it is better to leave the gap uncovered, thereby retarding the connective tissue and epithelium from interfering with initial population of the site with bone progenitor cells. 28 4. The implant should be inserted 2 mm from the buccal plate to circumvent encroaching on the buccal bony plate, thereby contributing to resorption. 29 5. Insert implants one mm below the crest of bone to account for crestal bone loss. 25,30 6. Biomaterials can be inserted without a barrier, thus avoiding flap elevation. But, if there is a bone dehiscence, it may be useful to place a barrier, and this would necessitate elevating a flap in order to achieve wound closure. 7. With a flapless approach, it was suggested that overfill of the gap with deproteinated bone helps support the soft tissue and reduces recession when it is done in conjunction with an abutment and temporary crown. 28 This statement is based upon a recently completed study. connective tissue graft or other soft-tissue biomaterial and advance a flap over it. If a clinician is in doubt abut the potential effectiveness of these procedures in a given situation, then a delayed protocol should be selected. Provisionalization for Immediately Placed Dental Implants It is recommended that an insertion torque of 30 to 40 Ncm be attained when placing an implant if an abutment and a provisional crown are to be inserted. 17 The provisional prosthesis should not be in occlusion for single tooth replacements. If multiple im plants are placed or the prosthesis turns the corner of the arch, or if it is a full arch provisional, then occlusion can be restored. If a permanent abutment is inserted, it may not have to be subsequently removed (avoids disrupting the junctional epithelium), and this may help de crease recession. 18,19 CONCLUDING REMARKS Placement of immediate implants is a predictable procedure, and attention to detail is essential to ensure success. The Table 20-30 lists guidelines to enhance successful placement of immediate implants in Type I sockets. Management of atypical situations outlined in this paper should en hance results and help avoid esthetic problems. Often, sockets, adjacent or opposing teeth can provide adequate visual cues for implant placement. How ever, surgical guides can be used to facilitate precise placement of im plants. 31 This is particularly true if multiple implants are placed or deviations from optimal anatomy are apparent. In this regard, contemporary implant planning/anatomy software can greatly simplify these surgical interventions. 32-34 5
REFERENCES 1. Lang NP, Pun L, Lau KY, et al. A systematic review on survival and success rates of implants placed immediately into fresh extraction sockets after at least 1 year. Clin Oral Implants Res. 2012;23(suppl 5):39-66. 2. Ortega-Martínez J, Pérez-Pascual T, Mareque-Bueno S, et al. Immediate implants following tooth extraction. A systematic review. Med Oral Patol Oral Cir Bucal. 2012;17:e251-e261. 3. Botticelli D, Berglundh T, Buser D, et al. The jumping distance revisited: an experimental study in the dog. Clin Oral Implants Res. 2003;14:35-42. 4. Paolantonio M, Dolci M, Scarano A, et al. Im mediate implantation in fresh extraction sockets. A controlled clinical and histological study in man. J Periodontol. 2001;72:1560-1571. 5. Caneva M, Salata LA, de Souza SS, et al. Hard tissue formation adjacent to implants of various size and configuration immediately placed into extraction sockets: an experimental study in dogs. Clin Oral Implants Res. 2010;21:885-890. 6. Covani U, Cornelini R, Barone A. Bucco-lingual bone remodeling around implants placed into immediate extraction sockets: a case series. J Periodontol. 2003;74:268-273. 7. Botticelli D, Berglundh T, Persson LG, et al. Bone regeneration at implants with turned or rough surfaces in self-contained defects. An experimental study in the dog. J Clin Periodontol. 2005;32:448-455. 8. Botticelli D, Berglundh T, Lindhe J. Hard-tissue alterations following immediate implant placement in extraction sites. J Clin Periodontol. 2004;31:820-828. 9. Tarnow DP, Chu SJ. Human histologic verification of osseointegration of an immediate implant placed into a fresh extraction socket with excessive gap distance without primary flap closure, graft, or membrane: a case report. Int J Perio dontics Restorative Dent. 2011;31:515-521. 10. Rodríguez-Ciurana X, Vela-Nebot X, Segalà-Torres M, et al. The effect of interimplant distance on the height of the interimplant bone crest when using platformswitched implants. Int J Perio dontics Restorative Dent. 2009;29:141-151. 11. Fishel D, Buchner A, Hershkowith A, et al. Roentgenologic study of the mental foramen. Oral Surg Oral Med Oral Pathol. 1976;41:682-686. 12. Chen ST, Wilson TG Jr, Hämmerle CH. Immediate or early placement of implants following tooth extraction: review of biologic basis, clinical procedures, and outcomes. Int J Oral Maxillofac Implants. 2004;19(suppl):12-25. 13. Salama MA, Salama H, Garber DA. Guidelines for aesthetic restorative options and implant site enhancement: the utilization of orthodontic extrusion. Pract Proced Aesthet Dent. 2002;14(pt 2):125-130. 14. Buskin R, Castellon P, Hochstedler JL. Ortho dontic extrusion and orthodontic extraction in preprosthetic treatment using implant therapy. Pract Periodontics Aesthet Dent. 2000;12:213-219. 15. Lee A, Fu JH, Wang HL. Soft tissue biotype affects implant success. Implant Dent. 2011;20:e38-e47. 16. Kan JY, Rungcharassaeng K, Lozada JL, et al. Facial gingival tissue stability following immediate placement and provisionalization of maxillary anterior single implants: a 2- to 8-year follow-up. Int J Oral Maxillofac Implants. 2011;26:179-187. 17. Chung S, McCullagh A, Irinakis T. Immediate loading in the maxillary arch: evidence-based guidelines to improve success rates: a review. J Oral Implantol. 2011;37:610-621. 18. Abrahamsson I, Berglundh T, Lindhe J. The mucosal barrier following abutment dis/reconnection. An experimental study in dogs. J Clin Periodontol. 1997;24:568-572. 19. Abrahamsson I, Zitzmann NU, Berglundh T, et al. The mucosal attachment to titanium implants with different surface characteristics: an experimental study in dogs. J Clin Periodontol. 2002;29:448-455. 20. Brownfield LA, Weltman RL. Ridge preservation with or without an osteoinductive allograft: a clinical, radiographic, micro-computed tomography, and histologic study evaluating dimensional changes and new bone formation of the alveolar ridge. J Periodontol. 2012;83:581-589. 21. Job S, Bhat V, Naidu EM. In vivo evaluation of crestal bone heights following implant placement with flapless and with-flap techniques in sites of immediately loaded implants. Indian J Dent Res. 2008;19:320-325. 22. Fickl S, Zuhr O, Wachtel H, et al. Tissue alterations after tooth extraction with and without surgical trauma: a volumetric study in the beagle dog. J Clin Periodontol. 2008;35:356-363. 6
23. Barros RRM, Novaes AB Jr, Papalexiou V. Buccal bone remodeling after immediate implantation with a flap or flapless approach: a pilot study in dogs. Titanium. 2009;1:45-51. 24. Chen ST, Buser D. Clinical and esthetic outcomes of implants placed in postextraction sites. Int J Oral Maxillofac Implants. 2009;24(suppl):186-217. 25. Chen ST, Darby IB, Reynolds EC. A prospective clinical study of non-submerged immediate im plants: clinical outcomes and esthetic results. Clin Oral Implants Res. 2007;18:552-562. 26. Araújo MG, Wennström JL, Lindhe J. Modeling of the buccal and lingual bone walls of fresh extraction sites following implant installation. Clin Oral Implants Res. 2006;17:606-614. 27. Caneva M, Botticelli D, Pantani F, et al. De proteinized bovine bone mineral in marginal defects at implants installed immediately into extraction sockets: an experimental study in dogs. Clin Oral Implants Res. 2012;23:106-112. 28. Tarnow D. Immediate vs. delayed socket placement: what we know, what we think we know and what we don t know. Lecture presented at: American Academy of Periodontology; November 14, 2011; Miami Beach, FL. 29. Evian CI, Waasdorp JA. Evaluating extraction sockets in the esthetic zone for immediate implant placement. Compend Contin Educ Dent. 2011;32:e58-e65. 30. Araújo MG, Lindhe J. Dimensional ridge alterations following tooth extraction. An experimental study in the dog. J Clin Periodontol. 2005;32:212-218. 31. Greenstein G, Cavallaro J. The relationship between biologic concepts and fabrication of surgical guides for dental implant placement. Compend Contin Educ Dent. 2007;28:196-203. 32. Giordano M, Ausiello P, Martorelli M, et al. Reliability of computer designed surgical guides in six implant rehabilitations with two years follow-up. Dent Mater. 2012;28:e168-e177. 33. Abboud M, Wahl G, Guirado JL, et al. Application and success of two stereolithographic surgical guide systems for implant placement with immediate loading. Int J Oral Maxillofac Implants. 2012;27:634-643. 34. Platzer S, Bertha G, Heschl A, et al. Threedimensional accuracy of guided implant placement: indirect assessment of clinical outcomes. Clin Implant Dent Relat Res. 2013;15:724-734. 7
POST EXAMINATION INFORMATION To receive continuing education credit for participation in this educational activity you must complete the program post examination and receive a score of 70% or better. Traditional Completion Option: You may fax or mail your answers with payment to Dentistry Today (see Traditional Completion Information on following page). All information requested must be provided in order to process the program for credit. Be sure to complete your Payment, Personal Certification Information, Answers, and Evaluation forms. Your exam will be graded within 72 hours of receipt. Upon successful completion of the postexam (70% or higher), a letter of completion will be mailed to the address provided. Online Completion Option: Use this page to review the questions and mark your answers. Return to dentalcetoday.com and sign in. If you have not previously purchased the program, select it from the Online Courses listing and complete the online purchase process. Once purchased the program will be added to your User History page where a Take Exam link will be provided directly across from the program title. Select the Take Exam link, complete all the program questions and Submit your answers. An immediate grade report will be provided. Upon receiving a passing grade, complete the online evaluation form. Upon submitting the form, your Letter of Completion will be provided immediately for printing. General Program Information: Online users may log in to dentalcetoday.com any time in the future to access previously purchased programs and view or print letters of completion and results. POST EXAMINATION QUESTIONS 1. If the jumping distance is, usually it will fill with bone without bone grafting. a. < 2 mm. b. 2 to 3 mm. c. 3 to 4 mm. d. 4 to 5 mm. 2. The buccal socket of a 2-rooted maxillary bicuspid is usually not a good location for an implant. It is too far to the buccal. a. The first statement is true, the second is false. b. The first statement is false, the second is true. c. Both statements are true. d. Both statements are false. 3. With respect to maxillary molars, alveolar bone in a healthy situation is: a. At the level of the cemento-enamel junction (CEJ). b. 2 mm apical to the CEJ. c. 4 mm apical to the CEJ. d. 6 mm apical to the CEJ. 4. With respect to mandibular bicuspids, the mental foramen is coronal to the apex of the first bicuspid: a. 25% of the time. b. 30% of the time. c. 38% of the time. d. 45% of the time. 5. To account for crestal bone loss, implants should be inserted: a. Level with the crest of bone. b. One mm below the crest of bone. c. 2 mm below the crest of bone. d. 3 mm below the crest of bone. 6. After a mandibular molar is extracted, an implant can be placed in the furcation bone. Usually the bone has adequate thickness to encompass the implant circumferentially. a. The first statement is true, the second is false. b. The first statement is false, the second is true. c. Both statements are true. d. Both statements are false. 8
7. To avoid inducing recession in the maxillary esthetic zone, it is preferable to do the following: a. Avoid raising a buccal flap. b. Extrude teeth. c. Place bone grafts to a crestal level. d. Remove abutments and replace several times. 8. Orthodontic extrusion of a tooth can coronally advance the tissue approximately : a. One mm a week. b. One mm a month. c. 2 mm a month. d. 3 mm a month. 9. In the esthetic zone, if the biotype is thin, place the immediate implant: a. More buccally and more apically. b. More palatally and less apically. c. More bucally and a little less apically. d. More palatally and a little more apically. 10. It is recommended that an insertion torque of be attained when placing an implant if an abutment and provisional crown are to be inserted. a. 20 to 30 Ncm. b. 30 to 40 Ncm. c. 40 to 45 Ncm. d. 45 to 50 Ncm. 9
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