Multiple teeth replacement with endosseous one-piece yttrium-stabilized zirconia dental implants

摘要

Objectives: The purpose of this study is to clinically and radiographically evaluate survival and success rate of multiplezirconia dental implants positioned in each patient during a follow-up period of at least 12 months up to 48 months.StudyDesign: Eight patients were treated for multiple edentulism with 29 zirconia dental implants. All implantsreceived immediate temporary restorations and 6 months after surgery were definitively restored. 6 months to 4years after implant insertion, a clinical-radiographic evaluation was performed in order to estimate peri-implanttissues health and peri-implant marginal bone loss.Results: Survival rate within follow-up period was therefore 100%. The average marginalboneloss (MBL)frombaseline to 6months was+1.375±0.388 mm;from6 monthsto 1 yearwas+0.22±0.598 mm; from1 yearto 2yearswas-0.368±0.387 mm;from 2 years to3 yearswas-0.0669±0.425 mm; from 3 years to 4 years +0.048±0.262mm. The mean marginal bone loss at 4 years from the implants insertion was +1.208 mm.Conclusions: According to several studies, when using a radiographic criterion for implant success, marginal boneloss below 0.9-1.6 mm during the first year in function can be considered acceptable. In our work, radiographicmeasurements of MBL showed values not exceeding 1.6 mm during the first year of loading and also 1 yearup to 4 years after surgery further marginal bone loss was minimal and not significant. This peri-implant bonepreservation may be associated to the absence of micro-gap between fixture and abutment since zirconia dentalimplants are one-piece implant. Moreover, zirconia is characterized by high biocompatibility and it accumulatessignificantly fewer bacteria than titanium.