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

Carlos A. Jurado; Clarisa Amarillas-Gastelum; Bruna Santos Honorio Tonin; Gentry Nielson; Kelvin Afrashtehfar; Nicholas G. Fischer

doi:10.1111/jopr.13625

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

Journal article

Peer reviewed

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

Carlos A. Jurado, Clarisa Amarillas-Gastelum, Bruna Santos Honorio Tonin, Gentry Nielson, Kelvin Afrashtehfar and Nicholas G. Fischer

Journal of prosthodontics, Vol.32(8), pp.728-734

10/2023

DOI: 10.1111/jopr.13625

PMID: 36471494

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Abstract

PurposeTo 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 methodsFifty-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 degrees and 55 degrees 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. ResultsThe 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]. ConclusionThe 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.

Dentistry, Oral Surgery & Medicine

Life Sciences & Biomedicine

Science & Technology

Details

Title: Subtitle: Traditional versus conservative endodontic access impact on fracture resistance of chairside CAD-CAM lithium disilicate anterior crowns: An in vitro study
Creators: Carlos A. Jurado - University of Iowa
Clarisa Amarillas-Gastelum - Stony Brook University
Bruna Santos Honorio Tonin - Universidade de São Paulo
Gentry Nielson - Texas Tech University Health Sciences Center at El Paso
Kelvin Afrashtehfar - Ajman University
Nicholas G. Fischer - University of Minnesota
Resource Type: Journal article
Publication Details: Journal of prosthodontics, Vol.32(8), pp.728-734
DOI: 10.1111/jopr.13625
PMID: 36471494
NLM abbreviation: J Prosthodont
ISSN: 1059-941X
eISSN: 1532-849X
Publisher: Wiley
Number of pages: 7
Language: English
Electronic publication date: 12/16/2022
Date published: 10/2023
Academic Unit: Prosthodontics
Record Identifier: 9984367722702771

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