Implant-supported crowns with locking taper implant-abutment connection: A systematic review and meta-analysis
Implant-supported crowns with locking taper implant-abutment connection: A systematic review and meta-analysis
Published:July 18, 2022DOI:https://doi.org/10.1016/j.prosdent.2022.06.005
Abstract
Statement of problem
Implant-supported single crowns are more prone to screw loosening than splinted prostheses.
Therefore, the locking taper system, which has a screwless abutment, may perform better
when associated with this type of rehabilitation. However, systematic reviews on this
system are lacking.
Purpose
The purpose of this systematic review was to evaluate the clinical performance and
complications of single crowns retained by the locking taper system.
Material and methods
This systematic review was registered at the International Prospective Register of
Systematic Reviews (PROSPERO) under CRD42020189921. An electronic search was made
in 5 databases and 3 other sources up to February 2021 to select prospective clinical
studies evaluating the performance of single crowns retained by the locking taper
system by using the outcomes implant survival, success rate, complications, marginal
bone loss (MBL), and prosthesis success rate. Four meta-analyses grouped according
to the follow-up intervals were performed. The risk of bias of the selected studies
was evaluated by using the RoB 2 checklist for randomized controlled trials (RCTs)
and Downs and Black for uncontrolled studies.
Results
Twelve studies were included: 9 prospective cohort studies and 3 RCTs. A survival
rate of 99% (98% to 99%) and a success rate of 97% (92% to 99%) after 5 years were
found. Of the total, 2.6% biological and 2.9% prosthetic complications were described.
The prosthesis success rate was 97% (96% to 98%) after 5 years. An average of −0.73
mm (−0.93 to −0.52) was found for the MBL after 5 years. The risk-of-bias assessment
showed 2 RCTs with high risk and 1 RCT with low risk of bias. Among uncontrolled studies,
2 were classified as poor and 7 as fair.
Conclusions
Single crowns retained by locking taper implants can be safely indicated based on
the high survival and success rates achieved in the long term, the maintenance of
bone level stability over time, and the low incidence of complications.
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