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首页> 外文期刊>The Journal of Prosthetic Dentistry >In vitro investigation of the wear of human enamel by dental porcelain.
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In vitro investigation of the wear of human enamel by dental porcelain.

机译：牙科瓷器对人牙釉质磨损的体外研究。

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STATEMENT OF PROBLEM: Metal ceramic systems are advocated when both esthetics and strength are required. A major drawback to many porcelains is their wear and destruction of opposing natural dentition. PURPOSE: This study evaluated the wear of enamel opposing 1 traditional and 2 recently introduced low-fusing feldspathic dental porcelains. MATERIAL AND METHODS: Six blocks of Ceramco II, Finesse, and Omega 900 feldspathic porcelain materials were fabricated and fired according to manufacturer recommendations. Porcelain blocks were polished through 0.25 microm diamond polishing paste. Thirty-six enamel specimens were obtained and milled to a 2 mm (+0.5 mm) diameter. Enamel specimens were attached to an offset cam motor operating at 60 Hz. Enamel specimens were in constant contact with the stationary porcelain blocks under a load of 600 g and traversed a distance of 8 mm. Diameter and height of enamel specimens were measured at times of 0, 6, 12, 24, and 48 hours and subsequent determination of enamel volume loss recorded. Profilometric surface roughness of the ceramic blocks was also measured for the corresponding times. RESULTS: Statistical analysis revealed that both Finesse and Omega 900 feldspathic porcelains caused significantly less enamel volume loss when compared with Ceramco II porcelain at all time intervals. Surface roughness revealed no consistent significant differences among porcelains. CONCLUSION: Both Finesse and Omega 900 porcelains were not as destructive to human tooth structure as Ceramco II porcelain. These results suggest an advantage of the new, lower-fusing porcelains in conditions where natural dentition wear is a concern.
机译：问题陈述：当需要美学和强度时，提倡金属陶瓷系统。许多瓷器的主要缺点是其磨损和相对自然齿的破坏。目的：本研究评估了与1款传统和2款最近推出的低熔长石牙齿瓷器相反的瓷釉的磨损。材料和方法：根据制造商的建议，制造并烧制了六块Ceramco II，Finesse和Omega 900长石瓷材料。瓷块通过0.25微米的金刚石抛光膏抛光。获得了36个搪瓷样品，并将其研磨至2毫米（+0.5毫米）的直径。将牙釉质样品连接到以60 Hz运行的偏心凸轮马达。搪瓷样品在600 g的载荷下与固定的瓷块保持恒定接触，并经过8 mm的距离。在0、6、12、24和48小时的时间测量牙釉质样品的直径和高度，然后记录牙釉质体积损失的测定结果。还测量了相应时间的陶瓷块的表面轮廓粗糙度。结果：统计分析表明，与所有时间间隔的Ceramco II瓷器相比，Fines和Omega 900长石瓷器引起的瓷釉体积损失明显更少。表面粗糙度显示瓷器之间没有一致的显着差异。结论：Finesse和Omega 900瓷对人类牙齿结构的破坏均不如Ceramco II瓷。这些结果表明，在考虑自然牙列磨损的情况下，新型低熔瓷的优势。

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