No abstract

Background : Currently, Morse taper (MT) connection implants have gained popularity due to their biological and mechanical advantages. However, other factors related to implant installation and prosthetic features which, mainly, depends of the treatment planning could trigger inflammatory response of the surrounding peri-implant tissues. In order to optimize the long-term prognostic of the treatment with dental implants, there is a need for further analysis of the possible impact of these factors. Aim/Hypothesis : The present cross-sectional multicenter study aimed to assess the association of implant and prosthetic factors to periimplantitis (PI) prevalence in dental treatments with two-pieces MT implants with at least 1 year in function. Materials and Methods : PI was diagnosed based on a stablished case definition, i.e. radiographic marginal bone loss(MBL) *3 mm, bleeding on probing(BOP) and/or a probing depth(PD) *6 mm. The prosthetic factors evaluated were: abutment (width and angulation), transmucosal abutment height, emergence profile (shape and angle), prosthetic fixture distance to the most apical point (peri-implant bone), type of retention (cemented or screwed), artificial gingiva (yes or not), type of prostheses (unitary, multiple, total), radiographic prostheses-abutment gap (ill/well-fitting). The assessed implant factors were: length and diameter, distance to adjacent teeth/implant (adequate or not), implant placement and loading time (immediate/delayed). A logistic regression was performed to determine the significant association to each factor with PI. Firstly, univariate analysis was performed of each independent variable (P < 0.05), and then was expressed by the adjusted odds ratio (OR) and corresponding 95% CI (P < 0.20).

Background : Dental implant (DI) treatments have been reported with a high survival rate. However, there are complications that affect hard and soft tissues. Health are characterized by no signs of inflammation (IF) and bleeding on probing (BOP) and there may be health around the DI with normal bone support or reduced. Mucositis and peri-implantitis (PI) are characterized by BOP and visual signs of IF, and PI is defined as a pathological condition associated with plaque, accompanied by MBL. Aim/Hypothesis : Clinically assess the prevalence of health, mucositis, PI, and radiographically, MBL for implant correlating the transmucosal portion of height prosthetic abutment (TPHPA) used, in rehabilitated patients with fixed full-arch implant-supported (FFAIS) with internal conical connection. Materials and Methods : Patients who had a FFAIS with conical internal connection for more than one year in function were included, totaling 107 implants, in 20 prostheses with transmucosal portion of the height of the prosthetic abutment (0.8; 1.5; 2.5; 3.5 mm). Peri-implant diseases were diagnosed based on an established case definition, that is, marginal radiographic bone loss ≥ 3 mm, BOP and / or probing depth (SD) ≥ 6 mm. For radiographic analysis, a horizontal line was drawn in the prosthetic connection, and the vertical lines were drawn as parallel as possible to a reference line (long axis of the implant). To analyze progressive MBL, an average was performed between mesial and distal bone changes from the baseline to the follow-up time. The chi-square test was used to verify the association between TPHPA and diagnosis. The ANOVA One-Way statistical test was used to compare MBL with the diagnosis and TPHPA. To find the differences between the groups, the post hoc test was performed using the Tukey test. Results : Combining the diagnosis (healthy, mucositis and peri-implantitis) with TPHPA 107 FFAIS with internal conical connection, it is observed that 43.8% of the implants with 0.8 mm TPHPA, were diagnosed with peri-implantitis (PI) identifying considerably decrease in IP with larger TPHPA sizes. When compared, the diagnosis with marginal radiographic bone loss (MBL) mean for implant, a statistical difference (P < 0.05) was observed between healthy patients (mean MBL of-1.56 mm) with patients diagnosed with PI (mean MBL of-2.77 mm). Regarding the comparison between the analyzes carried out with the TPHPA and the MBL for implant, it was possible to identify that there was a P < 0.05 between the TPHPA height with a 0.8 mm height with an mean MBL of-2.72 mm, and the 2.5 mm TPHPA-1.31 mm MBL. Conclusions and Clinical Implications : It was possible to observe that implants with prosthetic components with a transmucosal portion of the height of the prosthetic abutment of 0.8 mm were diagnosed mainly with peri-implantitis and, consequently, there was a greater marginal bone loss, suggesting caution in the planning of implants and prostheses, but also considering the difficulty of cleaning in fixed full-arch