In vitro analysis of durability of S-PRG filler-containing composite crowns for primary molar restoration

Yutaro Nakase; Satoshi Yamaguchi; Ernesto B Benalcázar Jalkh; Pablo J Atria; Lukasz Witek; Estevam A Bonfante; Hefei Li; Takahiko Sakai; Rena Okawa; Kazuhiko Nakano; Satoshi Imazato

doi:10.1016/j.dental.2023.04.006

In vitro analysis of durability of S-PRG filler-containing composite crowns for primary molar restoration

Dent Mater. 2023 Jul;39(7):640-647. doi: 10.1016/j.dental.2023.04.006. Epub 2023 May 17.

Authors

Affiliations

¹ Department of Dental Biomaterials, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan; Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
² Department of Dental Biomaterials, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan. Electronic address: yamaguchi.satoshi.dent@osaka-u.ac.jp.
³ Department of Prosthodontics and Periodontology, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
⁴ Department of Biomaterials, College of Dentistry, Universidad de los Andes, Santiago, Chile.
⁵ Biomaterials Division, NYU College of Dentistry, New York, NY, USA; Department of Biomedical Engineering, NYU Tandon School of Engineering, Brooklyn, NY USA; Hansjörg Wyss Department of Plastic Surgery, New York University Grossman School of Medicine, New York, NY, USA. Electronic address: lukasz.witek@nyu.edu.
⁶ Department of Dental Biomaterials, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
⁷ Department of Dental Biomaterials, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan; Department of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
⁸ Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.

PMID: 37208292
DOI: 10.1016/j.dental.2023.04.006

Abstract

Objective: To evaluate the reliability, maximum principal stress, shear stress, and crack initiation of a computer-aided design/computer-aided manufacturing (CAD/CAM) resin composite (RC) incorporating surface pre-reacted glass (S-PRG) filler for primary molar teeth.

Methods: Mandibular primary molar crowns fabricated by experimental (EB) or commercially available CAD/CAM RCs (HC) were prepared and cemented to a resinous abutment tooth using an adhesive resin cement (Cem) or a conventional glass-ionomer cement (CX). These specimens were subjected to a single compressive test (n = 5/each) and the step-stress accelerated life testing (SSALT) (n = 12/each). Data was evaluated using Weibull analyses and reliability was calculated. Afterwards, the maximum principal stress and crack initiation point of each crown was analyzed by finite element analysis. To evaluate bonding of EB and HC to dentin, microtensile bond strength (μTBS) testing was conducted using primary molar teeth (n = 10/each).

Results: There was no significant difference between the fracture loads of EB and HC for either cement (p > 0.05). The fracture loads of EB-CX and HC-CX were significantly lower than EB-Cem and HC-Cem (p < 0.05). The reliability at 600 N for EB-Cem was greater than that for EB-CX, HC-Cem, and HC-CX. The maximum principal stress concentrated on EB was lower than that on HC. The shear stress concentrated in the cement layer for EB-CX was higher than that for HC-CX. There was no significant difference among the μTBSs of EB-Cem, EB-CX, HC-Cem, and HC-CX (p > 0.05).

Significance: The crowns fabricated with the experimental CAD/CAM RC incorporating S-PRG filler yielded greater fracture loads and reliability than the crowns manufactured with commercially available CAD/CAM RC regardless of the luting materials. These findings suggest that the experimental CAD/CAM RC crown may be clinically useful for the restoration of primary molars.

Keywords: CAD/CAM; Fatigue; Glass ionomer cements; Primary teeth; Resin composites.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Composite Resins / chemistry
Computer-Aided Design
Crowns*
Dental Cements*
Dental Stress Analysis
Glass Ionomer Cements
Materials Testing
Molar
Reproducibility of Results
Resin Cements / chemistry

Substances

Dental Cements
Resin Cements
Glass Ionomer Cements
Composite Resins