Relationship between lateral guidance and complication incidence in single implant-supported posterior crowns

Purpose: With the increased number of implanted and restorations placed the number of incident also have increased. The purpose of this study was to evaluate the relationship between lateral guidance and the incidence of complications in single implant-supported posterior crowns.Methods: 40 patients, with a total of 70 implants and restorations, were divided into two lateral guidance categories of canine guidance (CG: 19 subjects) and group function (GF: 21 subjects). Next, three major complications composed of dental implant failure, abutment connecting screw loosening and crown needing re-cementation were evaluated in each of the two lateral guidance groups.Results: The incidence of implant fixture failure occurred significantly more often in GF than in CG (5.3% vs 0 %). GF also tended to have a higher incidence of screw loosening than CG (13.2% vs 9.4%, p=0.4149). However, CG tended to have a higher incidence of re-cementation than GF (21.9% vs 13.2%, p=0.1557). Although there was no significant difference between the two groups (p=0.7007), GF tended to have more occurrences of complications than CG with regard to the first year from the Kaplan-Meier survival estimation method. The overall success rate of osseointegration in this study was found to be 97.2% (68 of 70 implants).Conclusions: GF had significantly more implant-failure incidences than CG. Although there was no significant statistical difference, GF tended to have more occurrences of complications with regard to the first year and abutment connection screw loosening than CG. These results suggest CG is a better lateral guidance for single implant-supported posterior crown in clinically than GF.