上顎前歯のフェネストレーション欠損とデヒスセス欠損を2つの分類システムで分類

Fenestration and dehiscence defects in maxillary anterior teeth using two classification systems.

抄録

背景:

本研究の目的は、コーンビームCT（CBCT）を用いて上顎前歯部の頬側骨厚（BT）を評価し、骨の柵状欠損と脱離の有病率を評価・比較することである。

BACKGROUND: The primary objective of the study was to assess the buccal bone thickness (BT), evaluate and compare the prevalence of bone fenestration and dehiscence in anterior maxillary teeth using cone-beam computed tomography (CBCT).

方法:

300本の上顎前歯の画像を調査した。BTは骨稜、骨稜から3,6,9mm、歯根端で測定された。FenestrationとDehiscenceはYangとPanの分類にしたがって記録した．統計解析にはStudent's t-testとone-way ANOVAを用いた。

METHODS: Images of 300 maxillary anterior teeth were investigated. The BT was measured at the bone crest, 3, 6 and 9 mm from the bone crest, and apical. Fenestration and dehiscence were recorded according to Yang and Pan's classification. Student's t-test and one-way ANOVA were performed for statistical analysis.

結果:

FenestrationとDehiscenceの発生率はそれぞれ35.66％と20％であった。Type IIIのfenestrationはgroup 3（>65years）で高かった（P=0.028）。Type IとIVのfenestrationとCII DIIのdehiscenceはイヌ科に多かった（P>0.05）．根の長さの3分の2（46.76％）と3分の1（44.84％）を含むfenestrationがより一般的であった．また，根元全体を覆う脱落は8.4%であった．剥離の大部分（63.3％）は根の3分の1の長さに及んでいた。根の長さの3分の2を含む剥離と根全体を含む剥離はそれぞれ5%と9.95%であった．また，FenestrationとDehiscenceの併存は8.3%であった．上顎前歯部における口蓋側への脱離は1.65%であった．

RESULTS: Fenestration and dehiscence rates were 35.66% and 20%, respectively. Type III fenestration was higher in group 3 (>65 years) (P = 0.028). Type I and IV fenestration and CII DII dehiscence were more common in canines (P > 0.05). Fenestration involving two-thirds (46.76%) and one-third (44.84%) of the root length was more common. Fenestrations involving the entire root were 8.4%. Most of the dehiscence (63.3%) involved one-third of the root length. Dehiscence involving two-thirds of the root length and the entire root was 5% and 9.95%, respectively. The coexistence of fenestration and dehiscence was 8.3%. Dehiscence on the palatal aspect was detected in 1.65% of the anterior maxilla.

結論:

BT≦1mmは80.08％、≧2mmは3.66％であった。Fenestrationは犬歯に最も多く見られた．Fenestrationは先端3分の1に多く，Dehiscenceは冠状3分の1に多かった．

CONCLUSIONS: The rate of BT ≤1 mm was 80.08%, and ≥2 mm was 3.66%. Fenestration was most common in canines. Fenestration was mostly located in the apical third, while dehiscence was mostly located in the coronal third. © 2022 Australian Dental Association.