New Classification of Crown Forms and Gingival Characteristics in Taiwanese

Abstract

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.

Effect of gingival phenotype on the maintenance of periodontal health: An American Academy of Periodontology best evidence review

“…However, other studies have reported higher prevalence of thin gingival phenotype in females versus males Asian subjects seemed to have thin gingival phenotype compared with white subjects There is a disagreement in terms of tooth shape predicting gingival phenotype and the role of thickness of the labial plate on periodontal phenotype …”

“…The characteristics and results of the included studies for this clinically focused question are presented in Table . All 25 included studies reported data for both KTW and GT.…”

“…Differences in gingival tissue thickness between groups from different ethnic or racial backgrounds are known to exist. Four studies evaluated the gingival phenotype in Asian populations . A common clinical impression is that Asians tend to have susceptibility for gingival recession due to their thin gingival tissues .…”

“…Most gingival and periodontal studies have focused on White subjects which has resulted in a lack of similar information for other ethnic groups. Thus, Chou et al . conducted a clinical study to evaluate gingival characteristics in an Asian (Taiwanese) population.…”

“…The relationship between gingival and periodontal phenotypes and crown forms have been assessed in twelve studies . However, these studies reported inconsistent findings regarding the crown form as a predictor factor for gingival and periodontal phenotypes .…”