Classification of Gingival Phenotype in A Group of Thais by Cluster Analysis
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Abstract
The purpose of this study was to classify various forms of gingival phenotype based on the dimensions of maxillary central incisors and the surrounding gingival tissues in a sample of 100 periodontally healthy Thais (mean age 24.33±3.14 years). Four clinical variables were used in hierarchical cluster analysis: crown width/crown length ratio (CW/CL), gingival width (GW), papilla height (PH) and gingival thickness (GT) score. The latter was assessed by periodontal probe visibility through the sulcus wall. Three clusters with specific features were identified. Cluster 1 (34 males, 37 females) displayed a slender tooth form (CW/CL = 0.71), a GW of 4.92 mm, a PH of 4.40 mm, and a thin gingiva (Probe visible on one or both incisors) in 66.2% of the subjects. These parameters were significant difference from cluster 3 (7 males, 3 females) which displayed a quadratic tooth form (CW/CL = 0.84), a GW of 7.50 mm, a PH of 3.37 mm, and a thick gingiva (Probe concealed on both incisors) in 80.0% of the subjects. Cluster 2 (9 males, 10 females) presented mixed features between cluster 1 and cluster 3. These subjects showed a quadratic tooth form (CW/CL = 0.83), a narrow zone of gingival (GW = 4.61 mm), low papillae (PH = 3.53 mm) and thin gingiva in 73.7 % of the subjects. In conclusion, this analysis demonstrated two extreme gingival phenotypes, a narrow, thin and highly scalloped gingiva with slender teeth on the one hand (the most prevalent group, 71% of the subjects) and a wide, thick and flat scalloped gingiva with quadratic teeth on the other (10% of the subjects). For the remaining group (19% of the subjects), it was recognized with a narrow, thin, but flat gingiva and quadratic teeth.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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