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Published on: December 20, 2024
Strain analysis in posterior implant-supported fixed dental prostheses - cemented compared to screwed: An in vitro
Sarit Naishlos1, Joseph Nissan2, Asaf Shely2
1Department of Pediatric Dentistry, Tel Aviv University, Israel.
Background:
Research on the etiology of excessive strain at the implant neck, which may be associated with technical and biological complications, is still lacking.
Objectives:
This in vitro study aimed to compare strain development at the implant neck between cementretained and screw-retained implant-supported fixed restorations, as well as among 3 prosthesis designs, using strain gauge analysis.
Material And Methods:
Six prosthetic configurations were fabricated and divided according to their retention mechanism: single crowns - cement-retained and screw-retained (SC-c and SC-s, respectively); splinted restorations - cement-retained and screw-retained (SP-c and SP-s, respectively); and simple threeunit bridges - cement-retained and screw-retained (SB-c and SB-s, respectively). Two strain gauges were attached to the implant necks. A vertical load of 200 N was applied simultaneously at 3 identical loading points on each restoration. Strain measurements were analyzed statistically using ANOVA and Scheffé's post hoc contrast analysis.
Results:
Cement-retained restorations transferred significantly less cervical strain to the implant neck than screw-retained restorations in all 3 prosthetic configurations tested (p < 0.001; SC-c < SC-s; SP-c < SP-s; and SB-c < SB-s). Single crowns transferred significantly less strain to the implant neck than the other restoration designs in both cement-retained and screw-retained groups (p < 0.001; SC-c < SP-c and SB-c; SC-s < SP-s and SB-s).
Conclusions:
The use of cement-retained implant-supported fixed prostheses results in less strain development at the implant neck when subjected to high occlusal loads as compared to screw-retained prostheses. Splinting the adjacent implant-supported restorations does not necessarily reduce strain at the implant neck.
