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Analysis of proximal contact loss between implant-supported fixed dental prostheses and adjacent natural teeth: A two-year prospective study
摘要
Aims: This prospective study aimed to evaluate the incidence of interproximal contact loss (ICL) between implant-supported fixed dental prostheses (FDPs) and adjacent teeth and to analyze the possible causative factors of this phenomenon. Materials and methods: Patients in need of maxillary or mandibular posterior implant-supported partial FDPs (≤3 units) or single crowns (SCs) were recruited . All patients were followed up with clinical and radiographical examinations at 6, 12, and 24 months after delivery of the definitive implant restorations. The condition of interproximal contacts between implant-supported FDPs and adjacent mesial natural teeth were evaluated during the follow-up period. Prosthesis materials, implant positions, retained type, the condition of the mesial natural tooth, orthodontic treatment history, bruxism habit, and wearing conditions of the dentition were also assessed. Results: Twenty-seven patients with 68 implant-supported FDPs (62 SCs and 6 partial FDPs) were enrolled in this study. One participant dropped out because the adjacent mesial tooth was extracted due to a fracture before the 24-month follow-up. The overall mesial ICL rate was 13.2%, 23.5%, and 37.3% at 6-, 12-, and 24-month follow-up, respectively. Age (p = .002), orthodontic treatment history (p = .010), condition of the mesial natural tooth (p = .016), and obvious wear facets of natural dentition (p = .047) were significantly associated with the presence of ICL at 24-month follow-up. Conclusions: This study found that the longer the follow-up period was the higher the prevalence of mesial ICL. Furthermore, older age, patients not wearing an orthodontic retainer, a mesial tooth with crown or partial FDP, and severely worn dentition contributed to the mesial ICL of implant-supported FDPs.