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. 2 2009
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original article He Sung Shin et al: Complications Related to Cantilever Lengths in Implant- Supported Single Crowns. Implantology 2009 78 Implantology Vol. 13, No. 2 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 2009 79
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 2009 80 Implantology Vol. 13, No. 2 2009
Table 4. Prosthodontic complications No. of implants (failure rate) Screw loosening Decementation Porcelain fracture Food Impaction Abutment screw Fracture 115 14(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, 2009 81
original article 82 Implantology Vol. 13, No. 2 2009
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