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1 Complications Related to Cantilever Lengths in Implant-Supported Single Crowns He Sung Shin, Myung-rae Kim, Jae Hoon Lee *Private clinic **Graduate School of Clinical Dentistry at Ewha Womans University, ***Department of Prosthodontics College of Dentistry at Yonsei University Abstract Prosthesis using implant has become a popular modality to treat edentulous patients for the last 35 years. The progress in surface treatment reduces the failure rate and provides better functional and esthetic restorations in dentistry. The earliest form of implant prosthesis was the splinted-fixed type. After full arch and partial edentulous prosthesis began to demonstrate s stable clinical successes rate, single crowns started to be restored with implants.when the implant supported single crown is located most distally in the arch, special biomechanical factors should be considered. Especially when the implant is placed in a more distal position, there will be exposure to tremendous lateral forces resulting in possible complications. The purpose of this study is to analyze the relationship between complications and distance from adjacent teeth to the implant, and to identify the types and frequency of complications. A total of 115 patients charts were investigated randomly from the implant clinic at Ewha WomansUniversity Hospital and Yonsei University Dental Hospital. The patients received an implant supported single crown from 1996 to 2007 and annual afterwards. Patients were grouped according to the presence or lack of complications and the relationship of tooth to implant distance and complications was investigated. Age, sex, and abutment connection type were also analyzed for relationship with complications. The measured data from the two groups were analyzed statistically with SAS version 9.1 (SAS Inc., USA). There were significant statistical differences using logistic analysis (p<0.05) between the tooth to implant distance and complications. The odds ratio was 2.1 and cut off value from maximum value of specificity and sensitivity was 3.39 mm. SPSS 12.0(SPSS Inc. Chicago, Illinois. USA) Key words: complication, implant to tooth distance, single implant crown 76 Implantology Vol. 13, No

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3 original article He Sung Shin et al: Complications Related to Cantilever Lengths in Implant- Supported Single Crowns. Implantology Implantology Vol. 13, No

4 He Sung Shin et al: Complications Related to Cantilever Lengths in Implant-Supported Single Crowns. Implantology 2009 He Sung Shin et al: Complications Related to Cantilever Lengths in Implant-Supported Single Crowns. Implantology

5 original article He Sung Shin et al: Complications Related to Cantilever Lengths in Implant- Supported Single Crowns. Implantology 2009 He Sung Shin et al: Complications Related to Cantilever Lengths in Implant- Supported Single Crowns. Implantology 2009 He Sung Shin et al: Complications Related to Cantilever Lengths in Implant-Supported Single Crowns. Implantology Implantology Vol. 13, No

6 Table 4. Prosthodontic complications No. of implants (failure rate) Screw loosening Decementation Porcelain fracture Food Impaction Abutment screw Fracture (12%) 15(13%) 5(4%) 4(3.4%) 1(0.8%) He Sung Shin et al: Complications Related to Cantilever Lengths in Implant-Supported Single Crowns. Implantology 2009 Fig. 3. Biological and prosthodontic complications according to abutment connection type. He Sung Shin et al: Complications Related to Cantilever Lengths in Implant-Supported Single Crowns. Implantology 2009 합압이 가해진 후에 발생하였다. 치은염 임프란트 치주염 각 풀림이 관찰되었으며 Chi-squire test를 통한 분석 결과 나 각 4명의 환자(3.5%)에게서 관찰되었다. 사 풀림이 지대주 연결 방식에 따라 미치는 영향은 통계적 유 의차가 없는 것으로 나타났다 (p>0.05). 2. 보철적 합병증 외측 연결 방식과 내측 연결 방식에서 각각 7건씩의 나사 대한구강악안면임프란트학회 13권 2호,

7 original article 82 Implantology Vol. 13, No

8 1. Schmitt A, Zarb GA. The longitudinal clinical effectiveness of osseointegrated dental implants for single tooth replacement, Int J Prosthodont , Ekfeld A, Carlsson GE, Borjesson G. Clinical evaluation of single tooth restorations supported by osseointegrated implants. a retrospective study, Int J Oral Maxillofac implants , Haas R, Mensdorff-Pouilly N, Mailath G, et al. Branemark single tooth implants. a preliminary report of 76 implants, J Prosthet Dent , Jemt T, Laney WR, Harry D, et al. Osseointegrated implants for single tooth replacement. a 1 year report from a multicenter prospective study, Int J Oral Maxillofac Implants 6:29-39, Schwartz NL, Whitsett LD, Berry TG. Unserviceable crowns and fixed partial dentures. life span and causes for loss of serviceability, J Am Dent Assoc 81: , Walton JN, Gardner FM, Agar JR. A survey of crown and fixed partial denture failures, length of service and reasons for replacement, J Prosthet Dent 56: , Johnston JE, Phillips RN, Dykema RW, editors. Modern practice in crown and bridge prosthodontics, Philadelphia, 1971, WB Sauders. 8. Malevez C, Hermans M, Daelemans P. Marginal bone levels at Branemark system implants used for single tooth restoration: the influence of implant design and anatomical region, Clin Oral Implants Res 7: , Sullivan DY. Wide implants for wide teeth, Dent Econ 84:82-83, Rangert B, Krogh PH, Langer B, et al. Bending overlad and fixture facture: a retrospective clinical analysis, Int J Oral Maxillofac Implants 10: , Jemt T, Linden B, Lekholm U. Failures and complications in 127 consecutively placed fixed partial prostheses supported by Branemark implants: from prosthetic treatment to first annual check up, Int J Oral Maxillofac Implants 7:40-44, Quirynen M, Naert I, van Steenberghe D. Fixture design and overload influence marginal bone loss and fixture success in the Branemark system, Clin Oral Impalnts Res 3: , Naert I, Quirynen M, van Steenberghe D, et al. A six year prosthodontic study of 509 consecutively inserted implants for the treatment of partial edentulism, J Prosthet Dent 67: , Rangert B, Krogh PH, Langer B, et al. Bending overload and implant failure: a retrospective clinical analysis, Int J Oral Maxillofac Implants 7:40-44, Shackleton JL, Carr L, Slabbert JC, Becker PJ. Survival of fixed implant-supported prostheses related to cantilever lengths, J Prosthet Dent Jan;71(1): Rangert B, Jemt T, Jörneus L. Forces and moments on Brånemark implants, Int J Oral Maxillofac Implants Fall;4(3): Rodriguez AM, Aquilino SA, Lund PS. Cantilever and implant biomechanics: a review of the literature. Part 1, part 2, J Prosthodont Mar;3(1):41-6. Review., 1994 Jun;3(2): Review. 18. Adell R, Lekholm U, Rockler B, Brånemark PI. A 15-year study of osseointegrated implants in the treatment of the edentulous jaw, Int J Oral Surg Dec;10(6): Adell R, Lekholm U, Rockler B, Brånemark PI, Lindhe J, Eriksson B, Sbordone L. Marginal tissue reactions at osseointegrated titanium fixtures (I). A 3-year longitudinal prospective study, Int J Oral Maxillofac Surg Feb;15(1): Norton MR. An in vitro evaluation of the strength of an internal conical interface compared to a butt joint interface in implant design, Clin Oral Implants Res Aug;8(4): Mllersten L, Lockowandt P, Lindén LA. Comparison of strength and failure mode of seven implant systems: an in vitro test, J Prosthet Dent Dec;78(6): Merz BR, Hunenbart S, Belser UC. Mechanics of the implant-abutment connection. an 8-degree taper compared to a butt joint connection. Int J Oral Maxillofac Implants. 2000;15: Khraisat A, Stegaroiu R, Nomura S, Miyakawa O. Fatigue resistance of two implant/abutment joint designs. J Prosthet Dent. 2002;88: Y. MAEDA, T. SATOH & M. SOGO In vitro differences of stress con- 83

9 original article centrations for internal and external hex implant-abutment connections: a short communication J Oral Rehabil Jan;33(1): Salama H, Salama MA, Garber D, Adar P. The interproximal height of bone: a guidepost to predictable aesthetic strategies and soft tissue contours in anterior tooth replacement, Pract Periodontics Aesthet Dent Nov-Dec;10(9): Baron M, Haas R, Baron W, Mailath Pokorny G. Peri-implant bone loss as a function of tooth-implant distance. Int J Prosthodont Sep- Oct;18(5): Jung RE, Pjetursson BE, Glauser R, Zembic A, Zwahlen M, Lang NP. A systematic review of the 5-year survival and complication rates of implant-supported single crowns. Clin Oral Implants Res Feb;19(2): Epub 2007 Dec 7 84 Implantology Vol. 13, No

00)13-3목차1~3

00)13-3목차1~3 An evaluation of marginal bone level change in single short implant : an 1-year follow up Tae-Hoon Lee, Joo-Hyun Kwon, Sunjai Kim, Chong-Hyun Han Department of Prosthodontics, Kangnam Severance hospital,