Comparison of flexural strength according to thickness between CAD/CAM denture base resins and conventional denture base resins
Comparison of flexural strength according to thickness between CAD/CAM denture base resins and conventional denture base resins
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CAD/CAM 义齿基托树脂与传统义齿基托树脂不同厚度的弯曲强度比较
DOI：
10.14368/jdras.2020.36.3.183
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Joon
中科院分区：
文献类型：
--
作者：
Dong;Joon
目的：本研究的目的是根据厚度比较 CAD/CAM 义齿基托树脂与传统义齿基托树脂的弯曲强度。材料和方法： 对于传统的义齿基托树脂，使用的是 Lucitone 199® (C-LC)。 DIOnavi - Denture (P-DO) 和 DENTCA Denture Base II (P-DC) 用于 3D 打印义齿基托树脂。对于预聚合 PMMA 树脂，使用 Vipi Block Gum (M-VP) 和 M-IVoBase® CAD (M-IV)。样本的最终尺寸为 65.0 毫米 x 12.7 毫米 x 1.6 毫米/2.0 毫米/2.5 毫米。进行三点弯曲试验来测量弯曲强度和弯曲模量。使用扫描电子显微镜（SEM）对断裂样品的表面进行显微评估。检验数据的正态性后，采用单因素方差分析评价样本组间差异，显着性水平P=0.05。进行 Tukey HSD 测试用于事后分析。结果：在相同厚度下，除P-DO和C-LC外，CAD/CAM义齿基托树脂与常规义齿基托树脂的弯曲强度存在显着差异。 M-VP 显示出比传统义齿基托树脂更高的弯曲强度，P-DC 和 M-IV 显示出比传统义齿基托树脂更低的弯曲强度。弯曲模量以M-VP最高，其次是C-LC、P-DO、P-DC、M-IV，所有材料之间均存在显着差异。在按厚度比较弯曲强度时，C-LC中2.5毫米的弯曲强度明显高于1.6毫米的弯曲强度。 P-DC和M-VP中2.5mm和2.0mm的弯曲强度显着高于1.6mm。在M-IV中，随着厚度的增加，弯曲强度出现显着增加。 SEM 分析显示了样品的不同断裂面。结论：本研究中使用的不同 CAD/CAM 义齿基托树脂的弯曲强度根据每种材料的成分和性能而有所不同。 CAD/CAM义齿基托树脂的弯曲强度在厚度为1.6mm或以上时高于ISO 20795-1:2013建议的标准，尽管厚度有所减少。然而，对于较低厚度义齿的临床使用，还需要进一步研究较低厚度义齿基托树脂的其他性能。 （《牙科康复应用科学杂志》2020 年；36(3):183-95）
Purpose: The purpose of this study is to compare the flexural strength of CAD/CAM denture base resins with conventional denture base resins based on their thicknesses. Materials and Methods: For the conventional denture base resins, Lucitone 199® (C-LC) was used. DIOnavi - Denture (P-DO) and DENTCA Denture Base II (P-DC) were taken for the 3D printing denture base resins. For the pre-polymerized PMMA resins, Vipi Block Gum (M-VP) and M-IVoBase® CAD (M-IV) were used. The final dimensions of the specimens were 65.0 mm x 12.7 mm x 1.6 mm / 2.0 mm / 2.5 mm. The 3-point bend test was implemented to measure the flexural strength and flexural modulus. Microscopic evaluation of surface of fractured specimen was conducted by using a scanning electron micro scope (SEM). After testing the normality of the data, one-way ANOVA was adopted to evaluate the differences among sample groups with a significance level of P = 0.05. The Tukey HSD test was performed for post hoc analysis. Results: Under the same thicknesses, there are significant differences in flexural strength between CAD/CAM denture base resins and conventional denture base resins except for P-DO and C-LC. M-VP showed higher flexural strength than conventional denture base resins, P-DC and M-IV displayed lower flexural strength than conventional denture base resins. Flexural modulus was highest in M-VP, followed by C-LC, P-DO, P-DC, M-IV, significant differences were found between all materials. In the comparison of flexural strength according to thickness, flexural strength of 2.5 mm was significantly higher than that of 1.6 mm in C-LC. Flexural strength of 2.5 mm and 2.0 mm was significantly higher than that of 1.6 mm in P-DC and M-VP. In M-IV, as the thickness increases, significant increase in flexural strength appeared. SEM analysis illustrates different fracture surfaces of the specimens. Conclusion: The flexural strength of different CAD/CAM denture base resins used in this study varied according to the composition and properties of each material. The flexural strength of CAD/ CAM denture base resins was higher than the standard suggested by ISO 20795-1:2013 at a thickness of 1.6 mm or more though the thickness decreased. However, for clinical use of dentures with lower thickness, further researches should be done regarding other properties at lower thickness of denture base resins. (J Dent Rehabil Appl Sci 2020;36(3):183-95)