J Korean Acad Pediatr Dent.  2025 May;52(2):169-180. 10.5933/JKAPD.2025.52.2.169.

Anatomical and Dentoalveolar Features of Maxillary First Premolar Abnormal Eruption in Mixed Dentition

• Lee B
• Lee E
• Shin J
• Jeong T
• Park S

• KMID: 2567994
• DOI: http://doi.org/10.5933/JKAPD.2025.52.2.169

Abstract

This study aims to analyze anatomical and structural changes related to abnormal eruption of the maxillary first premolar in children, focusing on the correlation between maxillary sinus pneumatization volume and positional shifts in the premolar and canine. Twenty-nine children, with Hellman dental age IIIA, exhibiting unilateral abnormal eruption of the maxillary first premolar, were selected. Maxillary sinus morphology and the positions of tooth buds were assessed through CBCT images, and 3D-scanned diagnostic models were used to evaluate the upper arch form. The affected and control sides were compared in terms of sinus pneumatization and the positions of the first premolar and canine tooth buds. Maxillary sinus pneumatization on the affected side was significantly increased (p = 0.0202), while no significant difference was found in the total sinus volume (p = 0.9694). On the affected side, the apex of the first premolar was positioned more anteriorly (p = 0.0029) and more palatally (p = 0.0011) than that on the unaffected side. Additionally, the apex of the canine was positioned more posteriorly on the affected side compared to that on the unaffected side (p = 0.0039). Model analysis revealed that the anteroposterior total arch length on the affected side was longer than that on the control side (p < 0.0001), while the transverse width did not show any statistically significant difference. These findings suggest a potential relationship between maxillary sinus pneumatization and the abnormal eruption path of the first premolar, as well as possible effects on the eruption of canines.

Keyword

Maxillary first premolar; Abnormal eruption; Maxillary sinus; Pneumatization; CBCT