Identification of thin and thick gingival phenotypes by two transparency methods: A diagnostic accuracy study.

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There is limited information on the diagnostic accuracy of the transparency method to diagnose gingival phenotypes taking into consideration not only the gingival thickness (GT) but also the keratinized tissue width (KTW). Thus, the aim of the present study was to compare the diagnostic accuracy of two transparency methods using a conventional steel probe (SP) and a plastic color-coded probe (CCP) to identify thin and thick gingival phenotypes. Maxillary anterior teeth (n = 300) of 50 individuals were included in this study. The GT was measured via transgingival assessment at 2 mm apical to the gingival margin. Tooth sites were subdivided into thin or thick phenotypes according to the corresponding GT, respectively, ≤1 mm and >1 mm. SP and CCP were used to determine the gingival phenotype by the transparency method. The KTW was also evaluated. The diagnostic accuracy of the experimental periodontal probes to identify the thin and thick gingival phenotypes were compared. Of 300 gingival sites evaluated, 57% (n = 172) were identified as thin (GT: 0.82 ± 0.12 mm, KTW: 4 ± 1.2 mm) and 43% (n = 128) as thick phenotypes (GT: 1.16 ± 0.12 mm, KTW: 4.3 ± 1.3 mm) by the transgingival method. The SP and CCP were very sensitive (>0.94) to identify the thin phenotype, however, less specific (0.35-0.39) to diagnose thick phenotype. The diagnostic accuracy for the SP and CCP was similar, 0.69 and 0.70, respectively. The steel and color-coded plastic probe were equally effective in identifying thin gingival phenotype at maxillary anterior tooth sites.