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CC BY-NC-ND 4.0 · European Dental Research and Biomaterials Journal 2020; 1(02): 33-39
DOI: 10.1055/s-0040-1716944
Research Article

Evaluation of Fracture Resistance Force in Three Types of Primary Molar Crowns: Milled by CAD\CAM, 3D Dental Printed, and Composite Celluloid Crowns

Mohammed Nour Al-Halabi
1   Pediatric Dentistry Department, Dental College, Damascus University, Damascus, Syria
,
Nada Bshara
1   Pediatric Dentistry Department, Dental College, Damascus University, Damascus, Syria
,
John C. Comisi 
2   Department of Oral Rehabilitation, Medical University of South Carolina, James B. Edwards College of Dental Medicine, Charleston, South Carolina, United States
,
Jihad Abou Nassar
1   Pediatric Dentistry Department, Dental College, Damascus University, Damascus, Syria
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Abstract

Objective This study compares three types of esthetic crowns in fracture resistance force (FRF) and failure type: (1) polymethylmethacrylate (PMMA) milled by computer-aided design/computer-assisted manufacture (CAD\CAM), (2) resin-based material via three-dimensional (3D) dental printer, and (3) direct composite celluloid crowns technique in primary molars.

Material and Methods Thirty lower second primary molar were randomized into three experimental groups consisting of ten molars for each: group A:CAD\CAM crowns using PMMA blocks; group B: 3D dental printer to fabricate crowns using glycidyl carbamate photopolymer resin; group C: Selected teeth crowned using direct resin composite celluloid crowns. The three groups (A, B, and C) were stored in water at 37°C for 30 days. The FRFs for the experimental crowned teeth were measured using a universal test machine (Testometric) until fracture and the values compared with the mean maximum bite force of children in the primary dentition. FRFs and failure types were recorded and statistically analyzed.

Results One-way analysis of variance (ANOVA) revealed significant differences among the groups in FRF testing. Bonferroni test was used for multiple-correction comparison in comparing force needed to fracture the specimens in the three groups. A significant difference was noticed between groups B-C (p = 0.000) and groups A-C (p = 0.000). No significant statistical differences were noted between groups A-B (p = 0.325) in FRF scores. In failure type, no statistical differences were noted when comparing groups, A and B, groups B and C, but comparing groups A and C showed statistical differences in chi-square statistical test.

Conclusion The three tested esthetic crowns exceeded the mean maximum bite force of children in the primary dentition; thus, they can be expected to perform well clinically. Even though using an indirect technique (CAD\CAM milling and 3D printer) showed a higher score in FRF, direct composite celluloid crowns technique can be beneficial since it is easier to repair and still is a useful modality.

Keywords

computer-aided design/computer-assisted milled crowns - primary molars - fracture resistance force - stainless-steel crown


Publication History

Article published online:
01 October 2021

© 2020. European Dental Research and Biomaterials Journal. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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