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<p>Three-dimensional (3D) printing is increasingly used for pediatric crown restorations; however, post-processing procedures may critically influence their mechanical performance. This in vitro study evaluated the effects of washing and post-curing durations on the fracture resistance and fracture pattern distribution of 3D-printed pediatric crowns after thermal cycling. Ninety crowns fabricated using a digital light processing (DLP) printer were assigned to nine groups according to washing (0, 3, and 10&#xa0;min of ultrasonic cleaning) and post-curing (0, 10, and 20&#xa0;min) durations. After cementation onto standardized dies and 10,000 thermal cycles, fracture resistance was tested and fracture patterns were classified. Two-way analysis of variance revealed significant effects of washing and post-curing (<i>p</i> &lt; 0.001), with post-curing demonstrating the strongest individual influence and a significant interaction between factors. The highest fracture resistance was observed with 10&#xa0;min of ultrasonic washing followed by 10&#xa0;min of post-curing, whereas prolonged post-curing reduced strength. Fracture patterns also differed significantly among groups. These findings indicate that mechanical performance depends on the coordinated interaction of post-processing steps. For the tested resin system, 10&#xa0;min of ultrasonic washing followed by 10&#xa0;min of post-curing appears to represent a clinically applicable protocol to maximize fracture resistance.</p>

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Effect of different washing and post-curing protocols on the fracture resistance of 3D-printed pediatric crowns after thermal cycling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月29日

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  • Emre Serhan Alper,
  • Huseyin Simsek,
  • Suleyman Kutalmış Buyuk,
  • Cigdem Guler,
  • Mustafa Çadırcı

摘要

Three-dimensional (3D) printing is increasingly used for pediatric crown restorations; however, post-processing procedures may critically influence their mechanical performance. This in vitro study evaluated the effects of washing and post-curing durations on the fracture resistance and fracture pattern distribution of 3D-printed pediatric crowns after thermal cycling. Ninety crowns fabricated using a digital light processing (DLP) printer were assigned to nine groups according to washing (0, 3, and 10 min of ultrasonic cleaning) and post-curing (0, 10, and 20 min) durations. After cementation onto standardized dies and 10,000 thermal cycles, fracture resistance was tested and fracture patterns were classified. Two-way analysis of variance revealed significant effects of washing and post-curing (p < 0.001), with post-curing demonstrating the strongest individual influence and a significant interaction between factors. The highest fracture resistance was observed with 10 min of ultrasonic washing followed by 10 min of post-curing, whereas prolonged post-curing reduced strength. Fracture patterns also differed significantly among groups. These findings indicate that mechanical performance depends on the coordinated interaction of post-processing steps. For the tested resin system, 10 min of ultrasonic washing followed by 10 min of post-curing appears to represent a clinically applicable protocol to maximize fracture resistance.