Survival assessment of fractured porcelain-fused-to-metal crowns surface roughened by sandblasted and repaired by composite resin after in vitro thermal fatigue

Po-Jen Cheng; Shih-Ming Liu; Ssu-Meng Huang; Jen-Chyan Wang; Chun-Cheng Hung; Wen-Cheng Chen

Journal of Dental Sciences (Oct 2023)

Survival assessment of fractured porcelain-fused-to-metal crowns surface roughened by sandblasted and repaired by composite resin after in vitro thermal fatigue

Po-Jen Cheng,
Shih-Ming Liu,
Ssu-Meng Huang,
Jen-Chyan Wang,
Chun-Cheng Hung,
Wen-Cheng Chen

Affiliations

Po-Jen Cheng: Advanced Medical Devices and Composites Laboratory, Department of Fiber and Composite Materials, Feng Chia University, Taichung, Taiwan; Division of Dental Research, Department of Dentistry, Kaohsiung Municipal Min-Sheng Hospital, Kaohsiung, Taiwan
Shih-Ming Liu: Advanced Medical Devices and Composites Laboratory, Department of Fiber and Composite Materials, Feng Chia University, Taichung, Taiwan
Ssu-Meng Huang: Advanced Medical Devices and Composites Laboratory, Department of Fiber and Composite Materials, Feng Chia University, Taichung, Taiwan
Jen-Chyan Wang: Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
Chun-Cheng Hung: Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Corresponding author. School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Kaohsiung, 80756, Taiwan.
Wen-Cheng Chen: Advanced Medical Devices and Composites Laboratory, Department of Fiber and Composite Materials, Feng Chia University, Taichung, Taiwan; School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Fragrance and Cosmetic Science, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan; Corresponding author. Department of Fiber and Composite Materials, Feng Chia University, No. 100, Wenhwa Rd., Seatwen, Taichung, 40724, Taiwan.

Journal volume & issue: Vol. 18, no. 4
pp. 1706 – 1715

Abstract

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Background/purpose: Intraoral repair usually takes the convenience of the patient's daily life as the starting point, taking into account the bonding strength, operational feasibility, and safety. This study aimed to evaluate the survival of composite resin by simulating cavity fracture repair in porcelain-fused-to-metal (PFM) crowns and referring to the G.V. Black classification of caries as ceramic- and metal-site exposure. Materials and methods: Mechanical sandblast experimental and a nonsandblast control groups comprised 120 samples, and interfacial locking was enhanced through acid etching, bonding, and light-curing composite resin restoration. Classes of VI buccal (B), III mesial (M), and IV mesiobuccal (MB) types, were investigated. Load tests were performed on two sets, with one set at room temperature for 24 h and the other via thermal cycling at 5 °C/50 °C 720 times. Loading was gradually applied to the samples until a maximum of 450 N was reached. Results: Results showed that 24 h survival rates of B-, M − , and MB-repaired PFM crowns were 88%, 84%, and 88%, respectively. The repaired PFM survival rates for B, M, and MB were 52%, 44%, and 28%, respectively, after thermal cycling and loading tests. Multiple logistic regression and chi-square test (α = 0.05) showed that the regression results of factors affecting survival assessment were only significant between groups after thermal fatigue (P < 0.05). Survival rate of repairing metal-site in the MB model was significantly higher than that of ceramic-sites repairing in non-blasted samples. For the MB cavity model, sandblasting can significantly improve the survival rate of the repair of ceramic parts in the MB model (P < 0.05). Conclusion: Our results suggest that sandblasting can be further considered, especially for MB cavity fractures when ceramic-site restorations are required.

Published in Journal of Dental Sciences

ISSN: 1991-7902 (Print)
Publisher: Elsevier
Country of publisher: Taiwan, Province of China
LCC subjects: Medicine: Dentistry
Website: http://www.journals.elsevier.com/journal-of-dental-sciences/

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