Variation of chin morphology and mandibular incisor length in different facial divergence patterns: New insights from CBCT records

• Published in: Orthodontics & craniofacial research 2024-09
• Main Authors: Ghafari, Joseph G, Ziade, Eliane G, Kassab, Ammar, Saadeh, Maria, Macari, Anthony T
• Format: Article
• Language: English
• ISSN: 1601-6335; 1601-6343; 1601-6343
• DOI: 10.1111/ocr.12856

Evaluate constitutional differences in chin morphology and volume, and mandibular tooth size, between different facial divergence patterns. The sample consisted of 284 pretreatment cone beam computed tomography (CBCT) images of growing and non-growing patients who were stratified into 4 groups based on mandibular plane inclination to cranial base (SN) angle. Linear and angular measurements were made on the lateral CBCT images: mandibular lateral incisor crown (I-C) total (I-A) lengths, the distances between point D (centre of symphysis) and both incisor apex (D-A) and menton (D-Me) and between cemento-enamel junction and menton (CEJ-Me); chin width at the level of the central incisor apex (CWA) and point D (CWD); and the angles of the anterior and posterior symphyseal slopes. The volume of the symphysis was measured using a specialized 3D imaging software. Group differences and associations between parameters were gauged through the three-way ANOVA analysis. I-C, I-A, D-A, D-Me and CEJ-Me were greater in the hyperdivergent group (p  .05). The anterior slope angle decreased with hyperdivegence (p