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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparison of denture tooth movement between CAD-CAM and conventional fabrication techniques
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Comparison of denture tooth movement between CAD-CAM and conventional fabrication techniques

机译：CAD-CAM与常规制造技术之间的假牙齿移动的比较

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Abstract Statement of problem Data comparing the denture tooth movement of computer-aided design and computer-aided manufacturing (CAD-CAM) and conventional denture processing techniques are lacking. Purpose The purpose of this in?vitro study was to compare the denture tooth movement of pack-and-press, fluid resin, injection, CAD-CAM-bonded, and CAD-CAM monolithic techniques for fabricating dentures to determine which process produces the most accurate and reproducible prosthesis. Material and methods A total of 50 dentures were evaluated, 10 for each of the 5 groups. A master denture was fabricated and milled from prepolymerized poly(methyl methacrylate). For the conventional processing techniques (pack-and-press, fluid resin, and injection) a polyvinyl siloxane putty mold of the master denture was made in which denture teeth were placed and molten wax injected. The cameo surface of each wax-festooned denture was laser scanned, resulting in a standard tessellation language (STL) format file. The CAD-CAM dentures included 2 subgroups: CAD-CAM-bonded teeth in which the denture teeth were bonded into the milled denture base and CAD-CAM monolithic teeth in which the denture teeth were milled as part of the denture base. After all specimens had been fabricated, they were hydrated for 24 hours, and the cameo surface laser scanned. The preprocessing and postprocessing scan files of each denture were superimposed using surface-matching software. Measurements were made at 64 locations, allowing evaluation of denture tooth movement in a buccal, lingual, mesial-distal, and occlusal direction. The use of median and interquartile range values was used to assess accuracy and reproducibility. Levene and Kruskal-Wallis analyses of variance were used to evaluate differences between processing techniques (α=.05). Results The CAD-CAM monolithic technique was the most accurate, followed by fluid resin, CAD-CAM-bonded, pack-and-press, and injection. CAD-CAM monolithic technique was the most reproducible, followed by pack-and-press, CAD-CAM-bonded, injection, and fluid resin. Techniques involving compression during processing showed increased positive occlusal tooth movement compared with techniques not involving compression. Conclusions CAD-CAM monolithic dentures produced the best combination of accuracy and reproducibility of the tested techniques. The results from this study demonstrate that varying amounts of tooth movement can be expected depending on the processing technique. However, the clinical significance of these differences is unknown.
机译：摘要：缺乏将计算机辅助设计和计算机辅助制造（CAD-CAM）的义齿牙齿移动与传统义齿加工技术进行比较的问题陈述数据。目的这件事的目的是什么？体外研究的目的是比较用于制造假牙的包压法、液体树脂法、注射法、CAD-CAM粘结法和CAD-CAM整体技术的假牙牙齿移动情况，以确定哪种工艺生产的假牙最精确且可重复。材料和方法共评估了50个义齿，5组各10个。用预聚聚甲基丙烯酸甲酯制作并研磨主假牙。对于传统的加工技术（包装和压制、液体树脂和注射），制作了主假牙的聚乙烯硅氧烷腻子模具，其中放置假牙并注射熔融蜡。对每个蜡花饰义齿的浮雕表面进行激光扫描，生成标准的镶嵌语言（STL）格式文件。CAD-CAM义齿包括两个亚组：CAD-CAM粘结齿，其中义齿粘结到铣削义齿座中；CAD-CAM整体齿，其中义齿作为义齿座的一部分进行铣削。所有标本制作完成后，将其水合24小时，并对浮雕表面进行激光扫描。使用表面匹配软件对每个义齿的前处理和后处理扫描文件进行叠加。在64个位置进行测量，以评估义齿在颊侧、舌侧、近中-远侧和咬合方向的移动。使用中位数和四分位数范围值来评估准确性和再现性。Levene和Kruskal-Wallis方差分析用于评估加工技术之间的差异（α=0.05）。结果CAD-CAM整体技术最为准确，其次是液体树脂法、CAD-CAM粘接法、包装压榨法和注射法。CAD-CAM整体技术是最具重现性的，其次是包装和压榨、CAD-CAM粘合、注射和流体树脂。与不涉及压缩的技术相比，在加工过程中涉及压缩的技术显示出更积极的咬合牙齿移动。结论CAD-CAM整体义齿是测试技术准确性和再现性的最佳组合。这项研究的结果表明，根据加工技术的不同，牙齿的移动量可能会有所不同。然而，这些差异的临床意义尚不清楚。

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