339 - Association between Eruption Disturbance of the First Permanent Molar and Dentoskeletal Characteristics in Korean Children

Abstract:

Purpose:
This study aimed to analyze the dentoskeletal and dental arch characteristics of children with eruption disturbance of the first permanent molars, based on the location of the eruption disturbance.

Methods:
A retrospective study was conducted on pediatric patients aged 5 to 11 years who visited the Department of Pediatric Dentistry at Pusan National University Dental Hospital between January 2014 and December 2024. Subjects were categorized into four groups based on panoramic radiographs: (1) control group with normal eruption, (2) maxillary group (U6; eruption disturbance of maxillary first molars), (3) mandibular group (L6; eruption disturbance of mandibular first molars), and (4) bimaxillary group (UL6; eruption disturbance in both arches). Lateral cephalometric radiographs were analyzed to evaluate skeletal parameters including ANB, APDI, ODI, FMA, and CF. Digital dental models were used to measure arch perimeter, intercanine and intermolar widths, and anterior tooth dimensions.

Results:
A total of 221 cases were analyzed in the study. Skeletal classification differed significantly among groups (P=.0065), with more Class III cases in U6 and more Class II in L6. The U6 group showed significantly higher APDI (P=.0052) and lower ANB (P=.0021) than L6. The SI ratio, calculated as the sum of the mesiodistal widths of the four maxillary incisors divided by that of the four mandibular incisors, was significantly greater in U6 than L6 (P=.005). Maxillary arch perimeter was smaller in U6 than control and L6 (P < .001).

Conclusion:
Eruption disturbances of first molars are associated with dentoskeletal and dental arch features that vary by location.

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