Comparison of biological stability, and healthy of peri-implant tissues of different ceramic crown materials restoring a single implant. Prospective clinical study-1 year

Abstract

Statement of Problem: Clinical studies about single implant-supported prostheses made of monolithic Zirconia, Zirconia reinforced lithium silicate crown, and hybrid ceramic crowns are still clinically lacking. Purpose: The purpose of this randomized clinical trial was to compare biological stability and the health of peri-implant tissues of different ceramic crown materials of a single implant. Material and Methods: A total of 27 participants received 27 implant supported single restorations. This study was carried out on twenty-seven systemically healthy patients who are missing mandibular first permanent molar motivated to replace the missing teeth with implant restorations. Periapical radiographs and C.B.C.T. scans of the implant site were taken for all patients before treatment to assess bone quality and quantity. Patients were divided into three groups to receive three different super structures; the crown restorations were fabricated from three different materials (monolithic Zirconia, Zirconia reinforced lithium silicate Polymer infiltrated glass ceramic). After delivery of the definitive restorations, Clinical and radiographic parameters (Modified plaque index, Modified bleeding index, peri-implant Probing depth, implant stability quotient, and marginal bone loss) were recorded for all patients at the time of prosthesis insertion and then after 6, 9 and 12 months. Result: There was statistically significant between the related samples in all variables within the same group along with the follow-up period (modified plaque index, modified bleeding index, peri-implant probing index, marginal bone loss, and implant stability (I.Q.S.) as the level of significance p≤ 0.05. However, no statistically significant differences were found between all variables across the three crown materials groups with p values (0.204, 0.812, 0.951, 0.500, and 0.917, respectively). Conclusion: According to the results of this prospective clinical study, implant restorative materials influenced the superstructure materials can influence dental implant stability, suggesting that using restorative material with low elastic modulus will improved stability. By reducing the stress generated around a dental implant, Polymer infiltrated ceramic can be a promising alternative superstructure material for an implant-supported prosthesis in the future.