Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur; Centre of Comprehensive Care, Faculty of Dentistry, Universiti Teknologi MARA, Sungai Buloh, Selangor, Malaysia.
Department of Restorative Dentistry; Biomaterial and Technology Research Group, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia.
J Indian Prosthodont Soc. 2021 Apr-Jun;21(2):198-203. doi: 10.4103/jips.jips_41_21.
To investigate the effect of different cooling methods on denture base adaptation of rapid heat-cured acrylic resin using 3D superimposition technique.
In vitro - Comparative study.
Denture base adaptation of two different rapid heat-cured polymethyl methacrylate acrylic resins using five different cooling methods were compared. Forty maxillary edentulous stone cast were prepared to produce the denture bases with standardized thickness. The specimens were divided into five groups (n = 8) according to type of materials and cooling methods. The master stone cast and all forty denture bases were scanned with 3Shape E1 laboratory scanner. The scanned images of each of the denture bases were superimposed over the scanned image of the master cast using Materialize 3-matic software. Three dimensional differences between the two surfaces were calculated and color surface maps were generated for visual qualitative assessment.
Generalized Linear Model Test, Bonferroni Post Hoc Analysis.
All bench-cooled specimens showed wide green-colored area in the overall palatal surface, while the rapid cooled specimens presented with increased red color areas especially at the palate and post dam area. Generalized Linear Model test followed by Bonferroni post hoc analysis showed significant difference in the root mean square values among the specimen groups.
Samples that were bench cooled, demonstrated better overall accuracy compared to the rapid cooling groups. Regardless of need for shorter denture processing time, bench cooling of rapid heat-cured PMMA is essential for acceptable denture base adaptation.
使用 3D 叠加技术研究不同冷却方法对快速热固性丙烯酸树脂义齿基托适应性的影响。
体外 - 对比研究。
比较了五种不同冷却方法对两种不同快速热固性聚甲基丙烯酸甲酯丙烯酸树脂义齿基托适应性的影响。制备了 40 个上颌无牙颌石膏模型以制作具有标准化厚度的义齿基托。根据材料类型和冷却方法将标本分为五组（n = 8）。用 3Shape E1 实验室扫描仪扫描主石模型和所有 40 个义齿基托。使用 Materialize 3-matic 软件将每个义齿基托的扫描图像叠加在主模型的扫描图像上。计算两个表面之间的三维差异，并生成彩色表面图进行定性评估。
广义线性模型检验，Bonferroni 事后分析。
所有台架冷却的标本在整个腭面都显示出宽的绿色区域，而快速冷却的标本在腭部和后坝区域显示出更多的红色区域。广义线性模型检验后 Bonferroni 事后分析显示标本组之间均方根值有显著差异。
与快速冷却组相比，台架冷却的样本整体精度更好。无论是否需要更短的义齿加工时间，快速热固性 PMMA 的台架冷却对于可接受的义齿基托适应性都是必要的。
