title: Compatible CAD-CAM titanium abutments for posterior single-implant tooth replacement: A retrospective case series.
abstract: BACKGROUND
  In addition to the original abutments provided by implant companies, compatible computer-aided design and computer-aided manufacturing (CAD-CAM) abutments are also available from different manufacturers. However, the combination of abutments and implant systems from different manufacturers may lead to mechanical problems between components. Little has been reported on the clinical performance of this treatment option.
  
  
  OBJECTIVE
  The purpose of this retrospective case series was to evaluate the outcome of compatible CAD-CAM titanium abutments (TiAs) for posterior single-implant tooth replacement (PSITR) up to 6 years after insertion.
  
  
  METHODS
  Eighty-one patients (34 men, 47 women) who received PSITR restored with compatible CAD-CAM TiAs and had a final recall examination between May 2014 and April 2015 were included in this study. Clinical and radiographic examinations were documented. Retrospective evaluation of the patient records was also performed. Correlations between bone-level changes and variables were calculated using the Spearman correlation.
  
  
  RESULTS
  Implant and prosthesis survival rates were 100%. Twenty technical complications were observed, including 9 decementations of the crown, 6 screw loosenings, and 5 ceramic fractures. Periimplant mucositis was diagnosed in 36 patients (44.4%) and periimplantitis in 6 patients (7.4%). Correlation analysis showed a significant effect of the extent of periodontal bone loss of the remaining teeth on the marginal bone-level changes around implants (r=0.548, P<.001).
  
  
  CONCLUSIONS
  Compatible CAD-CAM TiAs provide a viable treatment option for PSITR. However, in light of relatively high screw-loosening and decementation rates, choosing appropriate cements and abutment manufacturers is essential to improve the clinical performance of this treatment option.
authors.affiliation: Lecturer, Department of Prosthodontics, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan city, Taiwan, Republic of China.
authors.forename: Kuang-Wei
authors.initials: KW
authors.lastname: Hsu
authors.affiliation: Assistant Professor, Department of Prosthodontics, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan city, Taiwan, Republic of China.
authors.forename: Yu-Fu
authors.initials: YF
authors.lastname: Shen
authors.affiliation: Assistant Professor, Department of Periodontology, Chang Gung Memorial Hospital, Taoyuan Branch, Taoyuan city, Taiwan, Republic of China. Electronic address: c28081@cgmh.org.tw.
authors.forename: Pein-Chi
authors.initials: PC
authors.lastname: Wei
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss; D017076:Computer-Aided Design; D003442:Crowns; D000044:Dental Abutments; D059605:Dental Implant-Abutment Design; D019250:Dental Implants, Single-Tooth; D003764:Dental Materials / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D012189:Retrospective Studies; D013624:Taiwan; D014025:Titanium / Q000737:chemistry*; D016896:Treatment Outcome
chemical_list: D003764:Dental Materials; D003776:Dental Porcelain; D014025:Titanium