The Open Dentistry Journal

ISSN: 1874-2106 ― Volume 14, 2020

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



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.


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).


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.

Article Information

Identifiers and Pagination:

Year: 2008
Volume: 2
First Page: 114
Last Page: 119
Publisher Id: TODENTJ-2-114
DOI: 10.2174/1874210600802010114

Article History:

Received Date: 4/1/2008
Revision Received Date: 25/3/2008
Acceptance Date: 17/9/2008
Electronic publication date: 28/11/2008
Collection year: 2008

© 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 ( 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:; and Department of Periodontics, Chung-Ho Memorial Hospital, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 807, Taiwan, E-mail:

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