RESUMO
Objectives: prefabricated functional appliances have therapeutic effects similar to those of custom-made functional appliances. This study aimed to assess the dentoskeletal effects of Multi P[registered sign] prefabricated functional appliance on Class II Div 1children in late mixed dentition
Methods: this open label trial was conducted on 18 children aged 9-12 years with Cl II Div 1 malocclusion due to mandibular deficiency during a 9-month period. Written informed consent was obtained from the parents. Multi P[registered sign] [RMO, Strasbourg, France] was used by the patients 4 hours/day and overnight [minimum of 8 hours] in conjunction with specific exercises [pressing the teeth in the recorded occlusion, pressing the tongue against the palate and uninostril breathing]. Patients were visited monthly. Study casts and cephalometric radiographs were obtained before and after the treatment. Data were analyzed using paired samples t-test and McNemar's test
Results: the Go-Gn [P=0.029] and Me-N [P=0.021] distances significantly increased following the use of appliance while overjet [P<0.0001], absolute overbite [P=0.002] and the Wits appraisal [P=0.019] significantly decreased. Other understudy angles did not change significantly
Conclusion: multi P[registered sign] appliance decreases the jaw base discrepancy and corrects the overjet and overbite