ArticleBMC oral health2026
Effect of attachment design and light-curing duration on shear bond strength in clear aligners.
Article in BMC oral health, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe objective of this study was to evaluate the effects of various attachment geometries and light-curing durations on shear bond strength and Adhesive Remnant Index (ARI) scores.
methodsA total of 90 extracted human premolars were divided into three groups based on attachment shape: rectangular, bevel, and ellipsoid (n = 30). Each group was further subdivided by curing time: 3 s (high-intensity LED, 2300–2500 mW/cm²) and 15 s (conventional LED, 1000–1200 mW/cm²), with 15 samples per subgroup. Attachments were designed in a CAD environment and bonded using customized transfer trays. Following bonding, samples were subjected to shear bond strength testing using a universal testing machine. Adhesive remnants were evaluated using the Adhesive Remnant Index (ARI). Data were analyzed using two-way ANOVA and Tukey HSD test (p < 0.05), with statistical processing performed in R (v4.4.0).
resultsNo significant difference was found in shear bond strength based on curing time [F(1,84) = 0.286, p = 0.594]. Under 3-second curing, rectangular attachments showed significantly greater shear bond strength than ellipsoids (p < 0.001). With 15-second curing, rectangular attachments also yielded significantly greater strength than both ellipsoid (p < 0.001) and bevel (p = 0.007) types. Ellipsoid attachments exhibited significantly higher ARI scores compared to the other groups (p < 0.05).
conclusionAttachment geometry significantly influenced shear bond strength, with rectangular attachments demonstrating the highest resistance in both curing durations. Curing duration alone did not produce a statistically significant effect. These findings underscore the importance of attachment selection in clinical treatment planning.
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