ArticleBMC oral health2026
Evaluation of cuspal deflection and microleakage of an incrementally packed versus a low shrinkage bulk-fill nanohybrid resin composite: an in-vitro study.
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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3 authors.
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Abstract
backgroundDespite the numerous advantages of using resin-based composite restorations, polymerization shrinkage and the resulting stresses remain significant concerns. These stresses are associated with two critical clinical outcomes: cuspal deflection and microleakage. This study aimed to evaluate the cuspal deflection and microleakage of an incrementally packed nanohybrid and a low-shrinkage bulk-fill resin composite.
methodsTo assess cuspal deflection, 40 maxillary premolars were randomly divided into two groups (n = 20). Standardized mesio-occluso-distal (MOD) cavities were prepared, and one group was restored with incremental Filtek Z250XT and the other with the low-shrinkage bulk-fill resin composite Grandio
resultsThe highest mean cuspal deflection was recorded in the incremental group (12.80 ± 2.57 μm) compared to the bulk-fill group (9.60 ± 2.41 μm). A statistically significant difference in cuspal deflection was observed between the two groups (p = 0.010). No significant difference was found in microleakage scores between the incrementally packed and bulk-fill groups (p = 0.305). The incrementally packed group exhibited the highest mean microleakage score (259.66 ± 20.53 μm), while the bulk-fill group had the lowest mean score (251.10 ± 15.36 μm). Regarding the effect of thermocycling on microleakage, regardless of the type of resin composite used, a statistically significant difference was noted between the non-thermocycled subgroup (241.12 ± 10.17 μm) and the thermocycled subgroup (269.63 ± 11.97 μm) (p < 0.001).
conclusionLow shrinkage bulk-fill composite reduced cuspal deflection in comparison to the incrementally packed materials. Bulk-fill and incrementally packed resin composites both showed comparable vulnerability to microleakage. The thermocycling procedure exerted a deteriorating effect on marginal integrity.
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