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Table 1 The definition, measurement methods and classification of different periodontal features

From: Assessment of the correlation between supracrestal gingival tissue dimensions and other periodontal phenotypes components via the digital registration method: a cross‑sectional study in a Chinese population

Classification

Parameters

Method

Definition

CM

CL

IOS

The shortest distance from the gingival zenith to the incisal edge

CW

The distance between the proximal tooth surfaces measured at the border between the middle and cervical portions

Crown shape

CW/CL

GM

GA

IOS

The angle between the gingival zenith and the zeniths of the corresponding adjacent gingival papillae

PA

The angle between the zenith of the gingival papilla and the gingival zeniths of the corresponding adjacent teeth

PW

The distance between the gingival zeniths of the adjacent teeth

PH

The shortest distance from the zenith of the papilla to a line connects the gingival zeniths of the adjacent teeth

SGH

IOS + CBCT

The distance from the gingival margin to the ABC

CEJ-ABC

The distance between the CEJ and the ABC

GT

Gingival thickness, comprise GTcej, GTabc, GT1 and GT2

GT-p

GT on the palatal side, comprise GTcej-p, GTabc-p, GT1-p and GT2-p

BM

BMA

CBCT

The angle between the bone margin zenith and the zeniths of the corresponding adjacent interproximal bone

IBA

The angle between the zenith of the interproximal bone and the corresponding adjacent bone margin zeniths

IBH

The shortest distance from the zenith of the interproximal bone to a line connects the adjacent bone margin zeniths

BT

IOS + CBCT

Bone thickness, comprise BT1 and BT2

BT-p

Bone thickness on the palatal side, comprise BT1-p and BT2-p

  1. CM: crown morphology; GM: gingival morphology; BM: bone morphology; IOS: intraoral scanning; CBCT: cone beam computed tomography; ABC: the crest of alveolar ridge; GTcej: gingival thickness (GT) at the level of the cementoenamel junction (CEJ); GTabc: GT at the ABC; GT1: GT from 2 mm apical to the ABC; GT2: GT from 4 mm apical to the ABC; GTcej-p: GT at the level of the CEJ on the palatal side; GTabc-p: GT at the ABC on the palatal side; GT1-p: GT from 2 mm apical to the ABC on the palatal side; GT2-p: GT from 4 mm apical to the bone crest on the palatal side; BT1: BT at 2 mm apical to the ABC; BT2: BT at 2 mm apical to the ABC; BT1-p: BT at 2 mm apical to the ABC on the palatal side; BT2-p: BT at 2 mm apical to the ABC on the palatal side