Cone beam computed tomography-based morphometric analysis of the coronoid process

The coronoid process plays a key role in mandibular function, but its morphometric characteristics remain underexplored. This cross-sectional study aimed to perform a detailed morphometric analysis of the coronoid process using cone beam computed tomography (CBCT). Coronoid height, condylar height, coronoid thickness, and coronoid-zygomatic distance were mea-sured bilaterally on CBCT images of 194 women and 149 men aged 18 to 86 years. The coronoid-condylar ratio (CCR) was analyzed in terms of the coronoid-condyle index, in which a CCR of 1.07 or less (≤ 1.07) is considered normal; a CCR greater than 1.07 and up to 1.15 (1.07 < CCR ≤ 1.15) is considered suggestive of pathology and should be investigated; and a CCR greater than 1.15 (> 1.15) is considered indicative of coronoid process hyperplasia. Statistical analyses included Student t test, analysis of variance, and Tukey tests for parametric measurements and Mann-Whitney U, Kruskal-Wallis, and Bonferroni tests for nonparametric measurements. A significance level of 5% was adopted. The measurements revealed that the coronoid process height was significantly greater in men than in women, but there were no statistically significant differences between age groups. The greatest condylar heights were observed in men, but the difference from the heights in women was only significant on the right side. Condylar height measurements differed with age; values decreased significantly on both sides beginning at 35 years. The coronoid thickness and coronoid-zygomatic distance were significantly reduced in individuals 35 years and older but did not differ between the sexes. There was a predominance of CCRs ≤ 1.15 on both sides, and CCRs > 1.15 were concentrated in patients aged 54 years or older. This study provides CBCT-based morphometric reference data on the coronoid process, highlighting variations by sex and age that may support diagnosis and improve surgical planning in cases of suspected anatomical alterations.