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<p>This study aimed to compare the marginal and internal adaptation of two bulk-fill and one conventional composite resin placed with different techniques using micro-CT. Twenty-one extracted human third molars with standardized mesio-occlusal cavities (a bucco-lingual width of 3&#xa0;mm, a mesio-distal width of 5&#xa0;mm, and a depth of 4&#xa0;mm) were randomly divided into three groups (<i>n</i> = 7): Group 1 was restored with SonicFill 2 using sonic activation and 4&#xa0;mm single layer, Group 2 with Tetric N-Ceram Bulk Fill in a 4&#xa0;mm single layer and Group 3 with Clearfil Majesty Posterior using a 2&#xa0;mm incremental technique. All restorations underwent 5,000 thermal cycles before micro-CT scanning. Data were analyzed using Kruskal-Wallis and Mann-Whitney U tests (<i>p</i> &lt; 0.05). The SonicFill 2 group showed a significantly greater marginal gap volume than the Tetric N-Ceram Bulk Fill group (<i>p</i> = 0.023), while no significant differences were found among the Clearfil Majesty Posterior group and the others (<i>p</i> &gt; 0.05). No significant differences were observed among the groups in terms of internal void volume (<i>p</i> = 0.101). These findings suggest that variations in marginal adaptation among different composite resins may be attributed to differences in their material composition and placement techniques which have a limited effect on internal adaptation.</p>

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Micro-CT evaluation of marginal and internal adaptation of composite resins using different application techniques

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月7日

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  • Yuksel Piskin,
  • Esra Cengiz-Yanardag

摘要

This study aimed to compare the marginal and internal adaptation of two bulk-fill and one conventional composite resin placed with different techniques using micro-CT. Twenty-one extracted human third molars with standardized mesio-occlusal cavities (a bucco-lingual width of 3 mm, a mesio-distal width of 5 mm, and a depth of 4 mm) were randomly divided into three groups (n = 7): Group 1 was restored with SonicFill 2 using sonic activation and 4 mm single layer, Group 2 with Tetric N-Ceram Bulk Fill in a 4 mm single layer and Group 3 with Clearfil Majesty Posterior using a 2 mm incremental technique. All restorations underwent 5,000 thermal cycles before micro-CT scanning. Data were analyzed using Kruskal-Wallis and Mann-Whitney U tests (p < 0.05). The SonicFill 2 group showed a significantly greater marginal gap volume than the Tetric N-Ceram Bulk Fill group (p = 0.023), while no significant differences were found among the Clearfil Majesty Posterior group and the others (p > 0.05). No significant differences were observed among the groups in terms of internal void volume (p = 0.101). These findings suggest that variations in marginal adaptation among different composite resins may be attributed to differences in their material composition and placement techniques which have a limited effect on internal adaptation.