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首页> 外文期刊>The Journal of Prosthetic Dentistry >Wear of two artificial tooth materials in vivo: a 12-month pilot study.
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Wear of two artificial tooth materials in vivo: a 12-month pilot study.

机译：在体内佩戴两种人造牙材料：为期12个月的初步研究。

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STATEMENT OF PROBLEM: Wear of methacrylate artificial teeth resulting in vertical loss is a problem for both dentists and patients. PURPOSE: The purpose of this study was to quantify wear of artificial teeth in vivo and to relate it to subject and tooth variables. MATERIAL AND METHODS: Twenty-eight subjects treated with complete dentures received 2 artificial tooth materials (polymethyl methacrylate (PMMA)/double-cross linked PMMA fillers; 35%/59% (SR Antaris DCL, SR Postaris DCL); experimental 48%/46%). At baseline and after 12 months, impressions of the dentures were poured with improved stone. After laser scanning, the casts were superimposed and matched. Maximal vertical loss (mm) and volumetric loss (mm(3)) were calculated for each tooth and log-transformed to reduce variability. Volumetric loss was related to the occlusally active surface area. Linear mixed models were used to study the influence of the factors jaw, tooth, and material on adjusted (residual) wear values (alpha=.05). RESULTS: Due to drop outs (n=5) and unmatchable casts (n=3), 69% of all teeth were analyzed. Volumetric loss had a strong linear relationship to surface area (P<.001); this was less pronounced for vertical loss (P=.004). The factor showing the highest influence was the subject. Wear was tooth dependent (increasing from incisors to molars). However, these differences diminished once the wear rates were adjusted for occlusal area, and only a few remained significant (anterior versus posterior maxillary teeth). Another influencing factor was the age of the subject. CONCLUSIONS: Clinical wear of artificial teeth is higher than previously measured or expected. The presented method of analyzing wear of artificial teeth using a laser-scanning device seemed suitable.
机译：问题陈述：甲基丙烯酸酯人造牙的磨损导致垂直损失对于牙医和患者而言都是一个问题。目的：本研究的目的是量化体内人造牙齿的磨损，并将其与受试者和牙齿变量相关联。材料与方法：28名接受全口义齿治疗的受试者接受了2种人造牙齿材料（聚甲基丙烯酸甲酯（PMMA）/双交联PMMA填充物; 35％/ 59％（SR Antaris DCL，SR Postaris DCL）;实验性48％/ 46％）。在基线和12个月后，用改良的石材浇注假牙的印模。激光扫描后，铸件被叠加并匹配。计算每颗牙齿的最大垂直损失（mm）和体积损失（mm（3）），并进行对数转换以减少变异性。体积损失与咬合有效表面积有关。线性混合模型用于研究颚，齿和材料因素对调整后的（残余）磨损值的影响（alpha = .05）。结果：由于脱落（n = 5）和铸件不匹配（n = 3），对69％的牙齿进行了分析。体积损失与表面积具有很强的线性关系（P <.001）;垂直损耗的影响不那么明显（P = .004）。影响最大的因素是受试者。磨损取决于牙齿（从门牙到磨牙的增加）。但是，一旦调整了咬合面积的磨损率，这些差异就减小了，只有少数保持显着（上颌前牙与后上牙）。另一个影响因素是受试者的年龄。结论：人造牙的临床磨损高于先前测量或预期的水平。提出的使用激光扫描仪分析人造牙磨损的方法似乎是合适的。

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