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本文根据离体牙生物力学实验研究结果以及残冠、残根临床疗效评价的客观需要对目前临床常见的牙体组织缺损——后牙残冠、残根进行了新的定义和缺损程度分类。分别根据牙冠咬合面缺损面积、缺损牙面数目以及牙面残留健康牙体组织高度等将残冠、残根进行定义和分类。将后牙咬合面缺损面积达到5/9的牙冠定义为残冠,将咬合面完全缺损且4个牙面中有1个牙面龈上残存健康牙体组织不足2 mm的残冠定义为残根。然后,再按缺损牙面分别将残冠、残根分为4类(Ⅰ、Ⅱ、Ⅲ、Ⅳ类)。对后牙残冠、残根进行定义和缺损程度分类便于客观地评定残冠、残根牙体缺损程度,提高其临床疗效评估的科学性,指导临床医师选择合适的修复方式和修复材料。
In this paper, based on the experimental results of isolated dental biomechanics and the objective assessment of the clinical efficacy of residual crowns and residual roots, new definition and degree of defects of the residual crowns and posterior teeth of common dental defects are presented. Residual crown and residual root were defined and classified according to the defect area of occlusal surface of dental crown, the number of missing tooth surface and the height of remaining healthy tooth tissue. The crown with a defect area of 5/9 posterior teeth occlusal surface was defined as the residual crown, the residual crown with complete occlusal surface defect and one tooth surface retained in the four tooth surfaces with less than 2 mm residual healthy tooth tissue was defined as Remaining roots. Then, the residual crown and residual root were divided into 4 groups (Ⅰ, Ⅱ, Ⅲ, Ⅳ) according to the defect surface. The definition and defect classification of the residual crown and residual root of the posterior tooth are helpful to objectively assess the degree of residual tooth crown and residual root defect and improve the scientific evaluation of clinical efficacy and guide the clinician to choose the appropriate repair method and repair material.