コーンビームCTを用いた犬歯内反症患者における上顎の骨格および歯列形態学的特徴。レトロスペクティブクリニカルスタディ

Skeletal and Dental Morphological Characteristics of the Maxillary in Patients with Impacted Canines Using Cone Beam Computed Tomography: A Retrospective Clinical Study.

抄録

本研究の目的は、Cone Beam Computed Tomography（CBCT）を用いて、片側口蓋側犬歯の衝撃を受けた被験者の上顎の骨格および歯槽骨の形態的特徴を分析することである。100名の成人患者を2群に分け、片側口蓋側上顎犬歯に衝撃を受けた患者（GI）と、左右半球のサブグループ（GI-R、GI-L）からなる群と、対照群として、衝撃を受けた犬歯を持たない群（CG）に分けてレトロスペクティブ臨床研究を実施しました。CBCTでは、骨格変数（上顎基底幅、歯槽堤高さ）と歯槽骨変数（上顎切歯の傾斜、切歯と犬歯の歯丈、弓長、歯のサイズ、骨歯の不一致）を測定した。骨格変数では，すべてのグループおよびサブグループにおいて，歯槽堤高さ（ACH）に統計的に有意な差が認められた（< 0.01）．歯槽骨変数では，上切歯の角度（II）と側切歯長（LLIL）がGIとGCで，上切歯の角度（II'），弓長（AL'），弓長-歯数差（ATD'）がGIサブグループで差があった（＜ 0.01）．片側口蓋嵌頓の上顎犬歯患者には骨格と歯槽骨の違いがあり、嵌頓のない患者と比較して角度および線形の寸法が低い。

The aim of this study is to analyze the skeletal and dentoalveolar morphological characteristics of the maxillary in subjects with a unilateral palatally impacted canine using Cone Beam Computed Tomography (CBCT). A retrospective clinical study was conducted of 100 adult patients divided into two groups: one consisting of patients with a unilaterally palatally impacted maxillary canine (GI), with the subgroups in the right and left hemiarches (GI-R and GI-L), and the second, without impacted canine, as the control group (CG). The CBCT measured skeletal variables (maxillary basal width and alveolar crest height) and dentoalveolar variables (inclination of the upper incisor, tooth lengths of incisors and canines, arch length, tooth size and bone dental discrepancy). In skeletal variables, statistically significant differences were found in alveolar crest height (ACH) in all groups and subgroups ( < 0.01). In the dentoalveolar variables, there were differences in the angle of the upper incisor (II) and lateral incisor length (LLIL) between the GI and GC and the angle of the upper incisor (II'), arch length (AL') and arch length-tooth size discrepancy (ATD') among the GI subgroups ( < 0.01). There are skeletal and dentoalveolar differences in patients with unilateral palatally impacted maxillary canines, with lower angular and linear measurements compared with patients without impaction.