Traditional versus conservative endodontic access impact on fracture resistance of chairside CAD-CAM lithium disilicate anterior crowns: An in vitro study.

Publisher: Wiley-Blackwell Country of Publication: United States NLM ID: 9301275 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1532-849X (Electronic) Linking ISSN: 1059941X NLM ISO Abbreviation: J Prosthodont

Publication: Hoboken, NJ : Wiley-Blackwell
Original Publication: Philadelphia, PA : W.B. Saunders Co., c1992-

Ceramics* ; Dental Restoration Failure*; Materials Testing ; Dental Stress Analysis ; Dental Porcelain ; Crowns ; Computer-Aided Design ; Dental Prosthesis Design

Purpose: To evaluate the effect of traditional and conservative endodontic access hole preparation on fracture resistance of chairside computer-aided design and computer-aided manufacturing (CAD-CAM) lithium disilicate maxillary right central incisor crowns.
Materials and Methods: Fifty-seven milled lithium disilicate maxillary right central incisor crowns were designed and fabricated with a chairside CAD-CAM system (Planmeca Romexis, Planmeca). The abutment preparation had a 1.0 mm incisal reduction and 1.0 mm chamfer finish. The restorations were bonded with resin cement to printed resin dies (n = 19 per group) and were treated and divided into three groups, (1) no endodontic access, (2) traditional triangular endodontic access, and (3) conservative ovoidal endodontic access. The endodontic access of the crowns was sealed with flowable resin composite. Restorations were subjected to 10,000 cycles of thermal cycling between 5° and 55°C. Then, restorations were loaded and exposed to compressive loading force, and the crack initiation (CI) and complete fracture (CF) were recorded. SEM micrographs of broken specimens on the printed dies were captured. ANOVA test and Bonferroni's correction were used for statistical comparison.
Results: The fracture resistance among the three groups varied. Crowns with no endodontic access displayed significantly (p < 0.001) higher resistance [CI: 1025 (121) N; CF 1134 (127) N], followed by crowns with conservative ovoidal endodontic access [CI: 924 (60) N; CF: 1000 (72) N. Crowns with traditional triangular endodontic access showed the significantly (p < 0.001) lowest fracture resistance [CI: 635 (82) N; CF: 709 (75) N].
Conclusion: The fracture resistance of chairside CAD-CAM lithium disilicate maxillary anterior crowns is influenced by the type of endodontic access provided. Conservative ovoidal endodontic access provides crowns with higher fracture resistance than traditional triangular endodontic access. Crowns with no endodontic access provided the highest resistance than other types of endodontic access.
(© 2022 by the American College of Prosthodontists.)

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Keywords: Crown; endodontic access; fracture resistance; lithium disilicate

0 (lithia disilicate)
12001-21-7 (Dental Porcelain)

Date Created: 20221206 Date Completed: 20231023 Latest Revision: 20231023

20231023

10.1111/jopr.13625

36471494