RESEARCH ARTICLE


New Classification of Crown Forms and Gingival Characteristics in Taiwanese



Yu-Hsiang Chou1, Chi-Cheng Tsai1, *, Jen-Chyan Wang1, Ya-Ping Ho1, Kun-Yen Ho1, Chuen-Chyi Tseng2, *
1 Department of Periodontics, Chung-Ho Memorial Hospital, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 807, Taiwan
2 Department of Periodontics, Chi-Mei Medical Center, 901 Chung Hwa Road, Yong Kang City Tainan Taiwan


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Creative Commons License
© Chou et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to these authors at the Department of Periodontics, Chi-Mei Medical Center, 901 Chung-Hwa Road, Yong-Kang City, Tainan, Taiwan; E-mail: jimtseng@ms15.hinet.net; and Department of Periodontics, Chung-Ho Memorial Hospital, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 807, Taiwan, E-mail: chchts@kmu.edu.tw


Abstract

Objectives:

The aim of the investigation was to examine the forms of the crowns in the maxillary anterior tooth segment and corresponding gingival characteristics among healthy Taiwanese subjects.

Materials and Methods:

The crown width at the apical third (CW), length (CL), gingival angle (GA) and the interdental papilla height were assessed from the diagnostic stone model using a calibrated periodontal caliper. A CW/CL-ratio was calculated for each tooth and averaged for each tooth region. Gingival thickness (GT) and width of keratinized gingiva (WG) were measured clinically.

Results:

The cluster analysis revealed 3 classifications of crown forms: narrow (N), compound (C) and square (S) types. There was a significant difference among the 3 classifications with respect to CW/CL-ratio, GT, and WG (p < 0.0001).

Conclusions:

The results demonstrated varied crown forms and corresponding gingival characteristics in Caucasian and Taiwanese. The new classifications hinted that there was a polymorphism in different races and could be a valuable esthetic guideline and reference for anterior tooth rehabilitation, including various periodontal and restorative treatments and anterior implant placement procedures in Taiwanese.

Key Words: Crown form, Gingival characteristics, Taiwanese.