Jurado, Carlos A; Sadid-Zadeh, Ramtin; Watanabe, Hidehiko; Robbins, Craig E; Afrashtehfar, Kelvin I; Fischer, Nicholas G; Lee, Damian J (2024). Effect of incisal preparation design on the fracture strength of monolithic zirconia-reinforced lithium silicate laminate veneers. Journal of prosthodontics, 33(3), pp. 281-287. Wiley 10.1111/jopr.13689
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Journal_of_Prosthodontics_-_2023_-_Jurado_-_Effect_of_incisal_preparation_design_on_the_fracture_strength_of_monolithic.pdf - Accepted Version Available under License Publisher holds Copyright. Download (1MB) | Preview |
PURPOSE
This study aimed to assess the fracture resistance of monolithic zirconia reinforced-lithium silicate laminate veneers (LV) fabricated on various incisal preparation designs.
MATERIALS AND METHODS
Sixty maxillary central incisors with various preparation designs were 3D-printed, 15 each, including preparation for: 1) LV with feathered edge design; 2) LV with butt joint design; 3) LV with palatal chamfer; and 4) full-coverage crown. Restorations were then designed and manufactured from zirconia-reinforced lithium silicate (ZLS) following the contour of a pre-operation scan. Restorations were bonded to the assigned preparation using resin cement and following the manufacturer's instructions. Specimens were then subjected to 10,000 thermocycles at 5°C to 55°C with a dwell time of 30 seconds. The fracture strength of specimens was then assessed using a universal testing machine at a crosshead speed of 1.0 mm/min. One-way ANOVA and Bonferroni correction multiple comparisons were used to assess the fracture strength differences between the test groups (α = 0.001). Descriptive fractographic analysis of specimens was carried out with SEM images.
RESULTS
Complete coverage crown and LV with palatal chamfer design had the highest fracture resistance values (781.4 ± 151.4 N and 618.2 ± 112.6 N, respectively). Single crown and LV with palatal chamfer had no significant difference in fracture strength (p>.05). LV with feathered edge and butt joint designs provided significantly (p<.05) lower fracture resistance than complete coverage crown and LV with palatal chamfer design.
CONCLUSION
The fracture resistance of chairside milled ZLS veneers was significantly influenced by the incisal preparation designs tested. Within the limitation of this study, when excessive occlusal forces are expected, LV with palatal chamfer display is the most conservative method of fabricating an indirect restoration. This article is protected by copyright. All rights reserved.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology |
UniBE Contributor: |
Afrashtehfar, Kelvin Ian |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
1532-849X |
Publisher: |
Wiley |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
05 Apr 2023 14:08 |
Last Modified: |
05 Apr 2024 00:25 |
Publisher DOI: |
10.1111/jopr.13689 |
PubMed ID: |
37014263 |
Uncontrolled Keywords: |
Computer-Aided Design Flexural Strength Silicates Subtractive Computer-Aided Manufacturing |
BORIS DOI: |
10.48350/181520 |
URI: |
https://boris.unibe.ch/id/eprint/181520 |
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