Impact of Mechanical Complications on Success of Dental Implant Treatments: A Case–Control Study

Abstract

Objective This study aimed to investigate the impact of mechanical complications on outcome measures for implant dentistry. Materials and Methods This case–control study included 282 patients with mechanical complications occurring in fixed prosthetic rehabilitation supported by immediate function implants with external connection (cases) and 282 individuals without mechanical complications (control). Pairing was performed for sex, age (range = 3 years), and follow-up months (range = 11 months). The primary outcome measure was implant survival, while the secondary outcome measures were marginal bone loss and biological complication parameters (peri-implant pathology, soft tissue inflammation, fistula formation, and abscess formation). Statistical Analysis Cumulative implant survival was estimated by using life tables. Descriptive statistics with 95% confidence intervals (CI) and inferential statistics (Chi-square test) were performed to evaluate differences between cases and controls. The significance level was set at 5%. Results The average follow-up duration was 8.5 years. Mechanical complications included prosthetic fracture (n = 159), abutment loosening (n = 89), prosthetic screw loosening (n = 20), milled abutment (n = 12), milled prosthetic screw (n = 1), and decemented crown (n = 1). Implant failure occurred in one patient from the control group, with survival rates of 100 and 99.6% for cases and controls, respectively (p = 0.317). The average marginal bone loss was 1.72 (95% confidence interval [CI]: 1.60–1.84) for cases and 1.55 (95% CI: 1.45–1.65) for controls (p = 0.068). Biological complications were observed in 90 patients, with significant differences between cases (n = 54) and controls (n = 36; p = 0.038). Conclusion Mechanical complications did not significantly influence survival or marginal bone loss; nevertheless, there is a need for studies with longer follow-up duration. Mechanical complications also significantly influence the incidence of biological complications.

The Success and Complications of Complete-Arch Implant-Supported Fixed Monolithic Zirconia Restorations: A Systematic Review

“…The success of rehabilitation is defined by its function, good esthetics, stability, no infection presence, and patient satisfaction [28]. Zirconium oxide (ZrO 2 ) has been used in Dentistry for over 15 years with many indications, focusing on replacing metal and improving esthetics [11], with an excellent survival rate, minimal technical complications, and good biocompatibility and esthetics [2][3][4].…”

“…Its success directly depends on the survival of each associated element (implants and restorations). Then, the survival of prostheses is directly associated with their functional presence within the mouth [28]. Moreover, the survival rate can be divided into follow-up intervals, which can be considered short term (1 to 5 years) or long term (5 to 20 years) [29].…”

Prevalence of Proximal Contact Loss between Implant-Supported Prostheses and Adjacent Natural Teeth: An Umbrella Review

“…The use of implant-supported prostheses in patients suffering from edentulousness is a good treatment with a good prognosis. 1 2 Nevertheless, various biological and mechanical complications are reported in implant prostheses 3 4 5 6 7 ; one of the most important complications is interproximal contact loss (ICL) between the implant prosthesis and the adjacent natural tooth, 8 9 and numerous physiological factors play a role in the occurrence of this complication, including the type, location, and chewing forces. In fact, the most important issue regarding this complication is the mesial migration of natural teeth, 10 11 for which periodontal ligament is responsible.…”

Effectiveness of Different Antimicrobial Agents on Malodor Prevention in Two-Stage Dental Implants: A Double-Blinded Randomized Clinical Trial

“…6 Although dental implants have a good predictability, both technical and biological complications have been reported. [7][8][9] Biological complications (i.e., peri-implantitis and bone loss) may occur due to reaction against microorganisms present in oral cavity. 9,10 Beside from implant failure, oral pathogenic bacteria-mostly anaerobic-are also responsible for oral malodor, which is defined as an unpleasant odor coming out of the mouth, nose, sinuses, or pharynx.…”