Treatment effects of orthopedic face mask assessed with counterpart analysis

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OBJECTIVE: To evaluate the effects of face mask therapy (RH) on middle cranial base and maxillo-mandibular complexes, and to compare the responses with untreated class 3 subjects. MATERIALS AND METHOD: The treatment group comprised 20 skeletal class 3 children (14 girls, 6 boys; mean age: 11 years 3 months) treated with RH assisted by rapid maxillary expansion (mean treatment time: 9.6 months). The control group included 22 skeletal class 3 subjects (9 girls, 13 boys; mean age: 10 years) observed for 9.5 months. Cephalometric measurements were performed by counterpart analysis. For intragroup statistical comparisons paired t-test, and for intergroup comparisons independent t-test was used. RESULTS: The treatment group revealed significant increases for SNA, ANB, SN-GoGn, Co-A and Co-Gn (p 0.001), and decrease for SNB (p 0.001). The treatment group revealed significant increases in the effective dimension of the middle cranial base (Ar-SE, p 0.05; So-Hor, p 0.001), maxilla (p 0.001), and anterior-posterior nasomaxillary complex (p 0.001, p 0.05, respectively), and decrease in the effective dimension of the mandibular corpus (p 0.05). According to the intergroup comparisons, treatment group revealed more pronounced maxillary advancement (p 0.001), posterior rotation in the mandible (p 0.001), significant increase in the effective dimension of the middle cranial base (So-Hor, p 0.01) and decrease in the effective dimension of the mandibular corpus at a significance level of p 0.001. CONCLUSION: Revealed by the effects on the middle cranial base morphology, favorable treatment responses were achieved with the use of the RH technique.

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Cephalometry , cranial base , mandible , maxilla , orthodontics , orthodontic appliances

Acta Odontologica Turcica

139

Acta Odontologica Turcica