Effect of preparation design and endodontic access on fracture resistance of zirconia overlays in mandibular molars: An in vitro study.

ABSTRACT:

Purpose

To evaluate the fracture resistance of zirconia overlays, considering various preparation designs and the presence of endodontic access.

Materials and methods

Ninety translucent zirconia (5Y-PSZ) overlay restorations were divided into six groups (n = 15/group) based on different preparation designs, with and without endodontic access: chamfer margin 4 mm above the gingival level without (group 1) and with endodontic access (group 2); margin 2 mm above the gingival level without (group 3) and with endodontic access (group 4); overlay with no chamfer margin without (group 5) and with endodontic access (group 6). Restorations were bonded to mandibular first molar resin dies, and the groups with endodontic access were sealed with flowable resin composite. All restoration

SUBMITTER: Jurado CA 

PROVIDER: S-EPMC11976686 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature