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Skeletal and non-skeletal factors associated with mandibular asymmetry in mixed dentition
Silvana Cumpa-Dávila1, Mariano Ortiz-Pizarro1, Juan Carlos Julca-Lévano1
1Facultad de Medicina, Universidad Católica Santo Toribio de Mogrovejo, Chiclayo, Peru.
Background:
Mandibular asymmetry is a complex challenge during mixed dentition. Aim: To determine the skeletal and non-skeletal factors associated with mandibular asymmetry in patients with mixed dentition.
Material And Methods:
The observational and cross-sectional study included 271 digital panoramic and lateral skull radiographs of patients from radiographic centers. The Eagle.PS Plate Scanner program was used to evaluate condylar morphology, lower second molar development, lower first molar loss, cervical vertebrae maturation, gonial angle, vertical growth, cranial base angle, intermaxillary relationship, and asymmetry. Frequencies, Spearman's Rho coefficient, Chi-square, and binomial logistic regression were used.
Results:
57.1% of patients were female, 61.3% were aged between 6 and 9 years, and 30% were at CS4 stage. Mandibular body asymmetry is related to age ranges (p=0.011). Patients with increased vertical growth (p=0.037; OR=3.20) and loss of the lower first molar (p=0.016; OR=11.33) are more likely to have mandibular ramus asymmetry; however, patients with an open cranial base angle are less likely to have it (p=0.039; OR=0.25). On the other hand, patients with a closed gonial angle (p=0.024; OR=3.48) and a bird's beak mandibular condyle shape (p=0.046; OR=2.68) are more likely to have mandibular body asymmetry.
Conclusions:
Asymmetry in mandibular body is associated with the age, while a decreased gonial angle and a bird-beak condyle shape predispose to asymmetry in mandibular body height. An increased vertical growth pattern and the loss of the first permanent lower molar predispose to asymmetry in mandibular ramus height, while an increased cranial angle is associated with a lower probability.
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