Altered Passive Eruption: Morphological Characteristics Based on Cone-Beam Computed Tomographic Images
Author(s): Truong Nhut Khue,, Huynh Thi Ngoc Thanh, Nguyen Thi Tuong Van and Do Thi Thao*
Abstract
Objective: This descriptive cross-sectional study aimed to characterize the morphological and periodontal features of altered passive eruption maxillary anterior teeth to better target the treatment method for individual patients. Methods: 38 patients (27 females and 11 males) with altered passive eruption (APE) type 1 were included. Teeth and periodontal parameters were measured on study casts and cone-beam computed tomographic images. Results: The width/length ratios of the central incisors, lateral incisors, and canines were 1.06, 1.02, and 1.03 mm, respectively. The mean distance between the cement–enamel junction and the alveolar bone crest was <1.5 mm. Thick gingival tissue was observed in 68.4% of the sample, and the buccal alveolar bone thickness was >1 mm. P values of less than 0.05 were considered statistically significant. Conclusion: No association between gingival tissue thickness and alveolar bone thickness was observed. The clinical and anatomical crown lengths of the three tooth groups of men were larger than those of women, but the difference was significant only for canines. Clinical examination combined with cone-beam computed tomographic images can be used in the diagnosis and treatment planning of APE. The aim of treatment is to restore the optimal biological width and reestablish the correlation between gingiva, tooth, and bone tissue.