title: Long-term evaluation of cantilevered versus fixed-fixed resin-bonded fixed partial dentures for missing maxillary incisors.
abstract: OBJECTIVE
  To evaluate the long-term longevity and patient-reported outcomes of two-unit cantilevered (CL2) and three-unit fixed-fixed (FF3) resin-bonded fixed partial dentures (RBFPDs) for the replacement of a maxillary permanent incisor.
  
  
  METHODS
  Twenty-eight subjects were randomly assigned to receive either a CL2 or FF3 RBFPD placed by one operator. Prosthesis longevity was determined by clinical examination and history. Success was defined as absence of complications requiring intervention and survival as retention of the original prosthesis in mouth. Subjects' satisfaction was assessed using visual analogue scale (VAS) and oral health-related quality of life (OHRQoL) using Oral Health Impact Profile (OHIP-49). Outcomes were analysed with t-test/Mann-Whitney U test, chi-square and log-rank test at significance level α=0.05.
  
  
  RESULTS
  Twenty-two subjects were reviewed. Thirteen of fifteen CL2 and ten of fourteen FF3 RBFPDs were examined (79.3 percent response rate) with a mean service life of 216.5±20.8months. All CL2 RBFPDs survived with no complications while only 10 percent of FF3 experienced no complications and only 50 percent of them survived (both P=0.000). CL2 had a significantly better success and survival rate than FF3 (P=0.000 and P=0.009, respectively). There was no significant difference in subjects' satisfaction and OHRQoL apart from CL2 group subjects had a higher satisfaction in cleaning of the prosthesis (84.1±13.6) than FF3 group (72.6±11.7) (P=0.05).
  
  
  CONCLUSIONS
  Two-unit cantilevered RBFPDs were observed to have a significantly better success and survival than the FF3 design for the replacement of a maxillary incisor. Good patient-reported outcomes have been found for RBFPDs in single-tooth replacement in aesthetic zone.
authors.affiliation: Oral Rehabilitation, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China. Electronic address: botelho@hku.hk.
authors.forename: Michael G
authors.initials: MG
authors.lastname: Botelho
authors.affiliation: Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.
authors.forename: Alex W K
authors.initials: AW
authors.lastname: Chan
authors.affiliation: Private Practice, Hong Kong, China.
authors.forename: Nic C H
authors.initials: NC
authors.lastname: Leung
authors.affiliation: Oral Rehabilitation, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.
authors.forename: Walter Y H
authors.initials: WY
authors.lastname: Lam
mesh_terms: D000328:Adult; D000044:Dental Abutments; D001840:Dental Bonding; D019232:Dental Restoration Failure; D003779:Denture Design; D003781:Denture Retention; D003830:Denture, Partial, Fixed; D016379:Denture, Partial, Fixed, Resin-Bonded / Q000706:statistics & numerical data*; D006801:Humans; D007180:Incisor; D008297:Male; D008437:Maxilla; D008875:Middle Aged; D017060:Patient Satisfaction; D011446:Prospective Studies; D011788:Quality of Life; D016388:Tooth Loss; D016896:Treatment Outcome
keywords: Longevity; Oral health related quality of life; Patient satisfaction; Resin bonded bridge; Survival