The definitions of residual roots and crowns of anterior teeth and the classification of the defect degrees
DUAN Jian-min
LI Si-han
WU Lei
WANG Wei-jian
Abstract：According to in vitro experimental research results of the tooth biomechanics and the objective needs of clinical curative effect evaluation, the residual crowns and residual roots of anterior teeth were defined and the tooth tissue defect degrees were classified. Residual crowns and residual roots were defined according to the defect area and were classified according to the residual healthy tooth tissue above gingival margin. Anterior tooth with the defect of 1/2 or more but less than 2/3 of crown was defined as residual crown and that with 2/3 or more of the crown as residual root. Residual crown defects were divided into 2 categories (ⅠandⅡ) according to the height of residual shoulder col-lar;residual root defects were divided into 5 categories (Ⅰ, Ⅱ, Ⅲ, Ⅳ andⅤ) according to the root defect degree. The definition and classification of residual crowns and residual roots of anterior teeth is convenient for evaluating resid-ual tooth defect and guiding dentist to choose proper repair methods and materials and providing reference frame to pre-dict and evaluate the curative effect.
Keywords：anterior toothresidual crownresidual rootdefinitiondefect degreeclassification
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 665-668,664 )