• Qianqian Gao, Tao Huang, Anna Wang, Qiong Sun, Fuhua Zhang, and Lei Zhang.
• Department of Stomatology, The Second People's Hospital of Hefei and Hefei Hospital Affiliated to Anhui Medical University, Hefei, Anhui, China.
• J Coll Physicians Surg Pak. 2025 Jan 1; 35 (1): 343834-38.

ObjectiveTo investigate the effects of bulk-fill, resin-based composite types (high or low viscosity) on the internal adaptation of Class V restorations.Study DesignExperimental study. Place and Duration of the Study: Hefei Stomatological Hospital, Hefei, China, from October 2022 to December 2023.MethodologyA total of 140 extracted human premolars were collected. Class V cavities were prepared on the buccal surface of each tooth, which was randomly divided into seven groups (n = 20). Cavities were restored by two low-viscosity and three high-viscosity bulk-fill resin-based composites or two conventional resin-based composites. All the samples were artificially aged. The percentage of debonding formation (D%) was calculated at baseline and 6 months later using optical coherence tomography (OCT). The OCT data were statistically analysed using one-way ANOVA, and the effects of composite type and artificial ageing were analysed via two-way ANOVA.ResultsFor Class V restorations, two low-viscosity bulk-fill resin-based composites generated significantly lower D% (p <0.05). Two-way ANOVA revealed that both composite type and artificial ageing significantly influenced internal adaptation (p <0.05).ConclusionThe low-viscosity bulk-fill resin composites demonstrated better internal adaptation both before and after artificial ageing.Key WordsBulk-fill resin composite, Debonding formation, Artificial ageing, Optical coherence tomography, Class V.

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