engleski

Dentoskeletal effects of modified bone anchored maxillary protraction (BAMP) in treatment of class III malocclusion

AIM: Aim was to explore dentoskeletal effects of modified bone anchored maxillary protraction (BAMP) in treatment of the subjects with class III malocclusion in comparison to control untreated group. SUBJECTS AND METHOD: Sample consisted of 8 subjects (4 girls, 4 boys) in the age range from 9.2-12.8 years (average 10.9±1.2). Control group consisted of untreated subjects matched by age and sex. Treatment group received hybrid hyrax (anchored on two palatal mini-implants and permanent first molars) in maxilla and mentoplate in the mandible, in combination with class III intermaxillary elastics. Lateral cephalograms were analysed for every subject before start of the treatment (T0) and at the end of treatment (T1) ; for the control group, two lateral cephalograms with time span similar to the treated matched pair were analysed. Average treatment time (T1-T0) was 1.7±0.5 years. The AudaxCeph v. 5.0.2 software (Audax, Ljubljana, Slovenia) was used for the cephalometric analyses according to Björk, Odegaard and Viazis. The t-test for two samples was used for the analysis of the changes between the treated group and control group ; reproducibility was tested on repeated measurements in one week interval (SPSS v. 22, IBM, Armonk, USA). RESULTS: There were significant differences between the T1-T0 changes between the treated and control group in the following variables: SNA angle (2.1±0.6), ANB angle (3±0.5), Wits (4.2±0.6), VerT-A (3±1), VerT-Pr (4.3±1.3), VerT-U1i (3.4±1.4), VerT-U6i (5.2±1.5), all at p<0.05. Dentoskeletal effects were associated with the forward growth stimulation of the maxilla, while the mandibular growth was unaffected by reciprocal force generated by class III intermaxillary elastics. Intraclass correlation coefficient was excellent for the SNA and ANB angles, Wits and VerT-A ; good for the SNB, VerT-Pr and VerT-U1i ; and moderate for the VerT-U6i. CONCLUSIONS: Skeletal treatment of class III with modified BAMP induced significant advancement of the maxilla, in comparison to changes induced by growth alone. The growth of the mandible was unaffected, despite the backwards traction via class III elastics anchored on the mentoplates.

bone anchored maxillary protraction ; class III ; mentoplates

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