The quality of dental casts used in crown and bridgework
The quality of dental casts used in crown and bridgework
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DOI：
10.1038/sj.bdj.4811621
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发表时间：
2004-09-11
影响因子：
2.6
通讯作者：
Smith, PW
中科院分区：
文献类型：
--
作者：
Alhouri, N;McCord, JF;Smith, PW
目的评价牙模在冠、桥构建中的质量。设计牙模的观察性横断面研究。在英国设有商业牙科实验室和大学牙科医院实验室。材料和方法分别从两个商业牙科实验室和一个“现场”大学牙科医院实验室中抽取了一个样本（n = 150），用于普通牙科诊所和牙科医院规定的冠和桥工作。根据软组织和硬组织再现的清晰度，使用简单的“3点”质量评估量表（好、一般和差）对铸型进行分类。结果相对于工作模，用于咬合目的的对置模质量明显好于工作模（P< 0.001）。此外，我们还发现，对于工作铸件而言，在同一拱内制备区域的质量明显优于在远离制备区域的质量（p< 0.001）。一般情况下，牙切面和咬合面铸型质量好于颊面和舌面。结论：本研究表明，用于冠和桥的铸型质量存在差异，特别是用于间接修复的铸型和用于衔接目的的铸型。这项研究强调了临床医生需要对冠、桥印模和铸模保持持续的警惕，特别是在离准备好的牙齿很远的地方。
Objective To assess the quality of dental casts used in crown and bridge construction.Design Observational cross-sectional study of dental casts.Setting Commercial dental laboratories and a university dental hospital laboratory in the UK.Materials and methods A sample ( n = 150) of working and opposing casts used for crown and bridgework prescribed by general dental practices and a dental hospital were sampled from two commercial dental laboratories and an 'on-site' university dental hospital laboratory respectively. A simple '3 point' assessment scale of quality ( good, fair and poor) was used to categorise the casts depending on the clarity of reproduction of soft and hard tissues.Results The quality of opposing casts used for articulation purposes was significantly better ( P< 0.001) than that of the working casts. In addition it was found that for working casts the quality in the preparation area(s) was significantly better ( p< 0.001) than that in areas remote from preparation( s) in the same arch. In general, the quality of casts in the incisal or occlusal surfaces was better than the buccal and lingual surfaces.Conclusions This study has demonstrated that variation exists in the quality of casts used in crown and bridgework, specifically those used in the construction of indirect restorations and also those used for articulation purposes. This study highlights the need for clinicians to exercise continued vigilance with crown and bridge impressions, and casts, particularly in areas away from the prepared teeth.