Olsson M, Lindhe J, Marinello C P
Department of Periodontology, Faculty of Odontology, University of Göteborg, Sweden.
J Clin Periodontol. 1993 Sep;20(8):570-7. doi: 10.1111/j.1600-051x.1993.tb00773.x.
The purpose of the present study was to examine the relationship between the form of the crowns in the maxillary front tooth segment and (1) a group of morphological characteristics and (2) the thickness of the gingiva. 108 subjects devoid of symptoms of destructive periodontal disease were examined regarding, e.g., probing depth, thickness of the free gingiva, width of the keratinized gingiva and the contour of the marginal gingiva. From clinical photographs of the maxillary front tooth region, the width (at the apical third--CW) and the length (CL) of the crowns of the 6 front teeth were determined. A CW/CL-ratio was calculated for each tooth and averaged for each tooth region. The individual mean CW/CL-ratio values for the central incisors were ranked. After correction for incisal attrition, the 10 subjects ranked highest and the 10 ranked lowest were selected as having either a long-narrow (group N) or a short-wide (group W) form of the crown of the tooth. The data for each of the examined parameters were averaged for each tooth region in each subject and mean values for subjects in groups W and N were compared using the Student t-test. Stepwise multiple regression analysis, including data from the whole sample, was performed for each tooth region with the thickness of the free gingiva as the dependent variable.(ABSTRACT TRUNCATED AT 250 WORDS)
本研究的目的是检验上颌前牙段牙冠形态与（1）一组形态学特征以及（2）牙龈厚度之间的关系。对108名无破坏性牙周疾病症状的受试者进行了检查，例如探诊深度、游离龈厚度、角化龈宽度和边缘龈轮廓。从上颌前牙区的临床照片中，确定了6颗前牙牙冠的宽度（在根尖三分之一处——CW）和长度（CL）。计算每颗牙齿的CW/CL比值，并对每个牙区的该比值求平均值。对中切牙的个体平均CW/CL比值进行排序。在对切缘磨损进行校正后，选择排名最高的10名受试者和排名最低的10名受试者，分别代表牙冠呈狭长型（N组）或短宽型（W组）。对每个受试者每个牙区的每个检查参数的数据求平均值，并使用学生t检验比较W组和N组受试者的平均值。以游离龈厚度为因变量，对每个牙区进行了包括整个样本数据的逐步多元回归分析。（摘要截选至250字）
