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首页> 外文期刊>The Journal of Prosthetic Dentistry >Clinical performance of a newly developed spectrophotometric system on tooth color reproduction.
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Clinical performance of a newly developed spectrophotometric system on tooth color reproduction.

机译：新开发的分光光度系统对牙齿颜色再现的临床表现。

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STATEMENT OF PROBLEM: Matching a natural maxillary central incisor to a metal ceramic crown is one of the most difficult challenges in clinical dentistry due to the limitations of dental shade guides and the subjectivity of perceptual evaluation. PURPOSE: The purpose of this study was to assess the clinical effectiveness of a spectrophotometric shade-matching system on tooth color reproduction. MATERIAL AND METHODS: Two metal ceramic crowns were fabricated for a maxillary central incisor for 36 patients using 2 shade-matching techniques. The first technique was conventional visual matching using 3 shade guide systems, and the second was an instrument-based color-matching technique using a new spectrophotometric system. Color difference (DeltaE) values between the contralateral natural tooth and each of the 2 crowns were calculated in the cervical, middle, and incisal regions. The DeltaE values were compared using a Student's t test (alpha=.05). Three calibrated examiners evaluated the color match by ranking it from 1 to 10 (10 = perfect match; 1 = no match; < or =8, accepted; > or =7, rejected). McNemar's test was used to calculate the odds ratio of accepting restorations fabricated using a spectrophotometric system to conventional methods. RESULTS: Results revealed that the mean DeltaE values of crowns matched with the spectrophotometer were significantly lower than those using a conventional technique (P<.001). The odds ratio of 12.5 was calculated, indicating that conventionally matched crowns were more likely to be rejected than those matched using the spectrophotometer (P<.001). CONCLUSIONS: In this clinical study, crowns fabricated using a dedicated spectrophotometer had a significantly better color match and a lower rate of rejection due to shade mismatch compared to crowns fabricated with a conventional shade-matching method.
机译：问题陈述：由于牙齿遮蔽引导装置的局限性和感知评估的主观性，将自然的上颌中切牙与金属陶瓷牙冠相匹配是临床牙科领域最困难的挑战之一。目的：本研究的目的是评估分光光度阴影匹配系统对牙齿颜色再现的临床有效性。材料与方法：使用2种阴影匹配技术，为36例患者的上颌中切牙制作了两个金属陶瓷冠。第一种技术是使用3种阴影引导系统的常规视觉匹配，第二种技术是使用新的分光光度系统的基于仪器的颜色匹配技术。计算对侧天然牙齿与2个冠中的每个冠之间的色差（DeltaE）值，分别位于宫颈，中部和切牙区域。使用Student t检验比较DeltaE值（alpha = .05）。三名经过校准的检查员通过将颜色匹配从1到10进行评级来评估颜色匹配（10 =完美匹配; 1 =不匹配; <或= 8，接受;>或= 7，被拒绝）。 McNemar的测试用于计算接受分光光度系统制造的修复体与常规方法的比值比。结果：结果表明，与分光光度计匹配的牙冠的平均DeltaE值明显低于使用传统技术的牙冠（P <.001）。计算出的比值比为12.5，这表明与使用分光光度计匹配的那些冠相比，常规匹配的冠更可能被拒绝（P <.001）。结论：在这项临床研究中，与使用传统的阴影匹配方法制造的牙冠相比，使用专用的分光光度计制造的牙冠具有明显更好的色彩匹配，并且由于阴影不匹配而导致的剔除率更低。

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