Dental materials : official publication of the Academy of Dental Materials · 2026
Wear resistance of composite repairs: Direct vs. semi-direct techniques in simulated oral aging.
СтатьяСравнительное исследованиеНазвание и аннотация: Перевод пока не подготовлен
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Wu Keyi, Cenci Jaisson, Theunisz Roderick, van Nistelrooij Niels, Walboomers X Frank, Loomans Bas A C, Pereira-Cenci Tatiana
Аннотация
OBJECTIVES: Wear resistance of composite repairs, especially under severe chemical-mechanical challenge, has not been investigated. This in vitro study evaluated the wear resistance of composite restorations repaired using different techniques in simulated oral aging.
METHODS: Sixty human molars with direct Mesio-occluso-distal composite restorations were aged in the "Rub&Roll" device simulating two years of clinical service. The restorations were repaired using direct (n = 29) or semi-direct (n = 29) techniques. Specimens were randomly divided into three aging media for an additional two-year simulation: deionized water (control), 1% citric acid solution (chemical-mechanical challenge), and yellow millet seed solution (mechanical challenge). Wear was assessed using profilometry and 3D scan. t-test, two-way ANOVA, and multiple linear regression were used for statistical analysis. p < 0.05 was considered statistically significant.
RESULTS: After repair, neither repair technique significantly influenced height or volume loss of specimens. The chemical-mechanical challenge had the greatest impact on height loss (coefficient = 0.11, 95% CI: 0.06-0.17 mm, p < 0.001) and volume loss (coefficient = 0.23, 95% CI: 0.13-0.32 mm3, p < 0.001) of specimens. The effect of techniques on height loss of repaired restorations was not significant. However, challenges affected height loss, with chemical-mechanical challenge showing the highest height loss (coefficient = 0.21, 95% CI: 0.16-0.28 mm, p < 0.001).
SIGNIFICANCE: The wear resistance of repaired composite restorations was not influenced by the repair technique. Instead, chemical-mechanical factors, were the primary determinants of wear, underscoring their critical role in the longevity of tooth-restoration complexes.
METHODS: Sixty human molars with direct Mesio-occluso-distal composite restorations were aged in the "Rub&Roll" device simulating two years of clinical service. The restorations were repaired using direct (n = 29) or semi-direct (n = 29) techniques. Specimens were randomly divided into three aging media for an additional two-year simulation: deionized water (control), 1% citric acid solution (chemical-mechanical challenge), and yellow millet seed solution (mechanical challenge). Wear was assessed using profilometry and 3D scan. t-test, two-way ANOVA, and multiple linear regression were used for statistical analysis. p < 0.05 was considered statistically significant.
RESULTS: After repair, neither repair technique significantly influenced height or volume loss of specimens. The chemical-mechanical challenge had the greatest impact on height loss (coefficient = 0.11, 95% CI: 0.06-0.17 mm, p < 0.001) and volume loss (coefficient = 0.23, 95% CI: 0.13-0.32 mm3, p < 0.001) of specimens. The effect of techniques on height loss of repaired restorations was not significant. However, challenges affected height loss, with chemical-mechanical challenge showing the highest height loss (coefficient = 0.21, 95% CI: 0.16-0.28 mm, p < 0.001).
SIGNIFICANCE: The wear resistance of repaired composite restorations was not influenced by the repair technique. Instead, chemical-mechanical factors, were the primary determinants of wear, underscoring their critical role in the longevity of tooth-restoration complexes.