BMC oral health · 2026
Evaluation of mandibular ramus asymmetry in patients with unilateral congenital tooth agenesis.
СтатьяНазвание и аннотация: Перевод в очереди
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İz Fidan, Dindaroğlu Furkan
Аннотация
BACKGROUND: This study aimed to evaluate mandibular ramus asymmetry in individuals with unilateral congenital tooth agenesis using panoramic radiography. The results were compared with individuals without agenesis and with bilateral agenesis.
METHODS: The study included 150 individuals in three groups [no agenesis, bilateral, unilateral]. Condylar height, ramus height, and mandibular length were measured on panoramic radiographs using Viewbox-4, and asymmetry indices were calculated with the Habets formula. Statistical analyses were performed in SPSS 27.0 with significance set at p < 0.05.
RESULTS: No significant differences were observed among groups in linear measurements [p > 0.05]. However, the unilateral agenesis group showed higher ramus and mandibular asymmetry indices [RAI: 2.05 ± 1.97; MAI: 2.15 ± 1.79] compared to the bilateral agenesis [RAI: 1.50 ± 1.23; MAI: 1.40 ± 1.03] and control groups [RAI: 0.89 ± 0.87; MAI: 0.82 ± 0.74] [p < 0.001]. Ramus asymmetry was strongly correlated with overall mandibular asymmetry. In posterior unilateral agenesis cases, condylar and mandibular asymmetries were significantly greater [CAI: 7.67 ± 5.43 vs. 3.98 ± 3.11, p = 0.019; MAI: 2.70 ± 2.14 vs. 1.40 ± 1.11, p = 0.023]. Condylar asymmetry was also higher in individuals with mandibular agenesis than those with maxillary agenesis [p = 0.022].
CONCLUSION: Unilateral congenital tooth agenesis, particularly in posterior or mandibular cases, was associated with increased mandibular asymmetry. Ramus height was significantly associated with overall mandibular asymmetry. Panoramic radiography can be considered a practical first-line tool, while CBCT may be reserved for more detailed evaluation when necessary.
METHODS: The study included 150 individuals in three groups [no agenesis, bilateral, unilateral]. Condylar height, ramus height, and mandibular length were measured on panoramic radiographs using Viewbox-4, and asymmetry indices were calculated with the Habets formula. Statistical analyses were performed in SPSS 27.0 with significance set at p < 0.05.
RESULTS: No significant differences were observed among groups in linear measurements [p > 0.05]. However, the unilateral agenesis group showed higher ramus and mandibular asymmetry indices [RAI: 2.05 ± 1.97; MAI: 2.15 ± 1.79] compared to the bilateral agenesis [RAI: 1.50 ± 1.23; MAI: 1.40 ± 1.03] and control groups [RAI: 0.89 ± 0.87; MAI: 0.82 ± 0.74] [p < 0.001]. Ramus asymmetry was strongly correlated with overall mandibular asymmetry. In posterior unilateral agenesis cases, condylar and mandibular asymmetries were significantly greater [CAI: 7.67 ± 5.43 vs. 3.98 ± 3.11, p = 0.019; MAI: 2.70 ± 2.14 vs. 1.40 ± 1.11, p = 0.023]. Condylar asymmetry was also higher in individuals with mandibular agenesis than those with maxillary agenesis [p = 0.022].
CONCLUSION: Unilateral congenital tooth agenesis, particularly in posterior or mandibular cases, was associated with increased mandibular asymmetry. Ramus height was significantly associated with overall mandibular asymmetry. Panoramic radiography can be considered a practical first-line tool, while CBCT may be reserved for more detailed evaluation when necessary.