IADR Abstract Archives
Class II Deep-Bite Growth Modification by Seifi-Functional with High Efficacy
Objectives: The aim of the present study was to determine the efficacy of Seifi functional in growth modification of Class II deep bite cases considering the chair time and treatment duration.
Methods: Subjects of the study were 40 individuals (28 females, 12 males) with Class II, Division 1 deep bite malocclusion and average age of 9.84±1.24 years; referring to departments of orthodontics and pedodontics of Shahid Beheshti dental school or private sector. Seifi functional was administered for minimum 6 months with average of 10.2±2.01 month. Cephalometric measurements and efficacy of the appliance were evaluated and compared by Paired T test.
Results: Seifi functional is capable of increasing SNB, Facial angle, Mandibular length, Ramus length, L6-MP, and Mentolabial sulcus significantly. In addition, a significant decrease was shown in Overjet, ANB, AB diff., U1-SN, and Overbite (p<0.05). However, increase in SN-GoGn, MP-SN, IMPA, ANS-Me/N-Me, Co-ANS, Li/E plane and decrease in SNA, PFH/AFH were not significant (p>0.05). First molar relationships were improved significantly. Decreasing the chair time (eliminating the acrylic grinding) and diminishing the treatment duration by taking maximum advantage of simultaneous three dimension corrections i.e. sagittal, vertical, and transverse were significant (p<0.05).
Conclusions: By application of the Seifi functional, mandible is located in a more forward position and neuromuscular systems gradually adapts to the new functional position which leads to bone remodeling and skeletal changes in sagittal dimension. Mandible in unlocked by opening the jack screw that increase the arch width in maxillary constriction cases and better arch coordination is achieved after inter-canine and inter-molar expansion. Occlusion is discluded by acrylic thickness capping of the lower incisors, plus lack of any retentive clasps on the lower posterior teeth cause unrestricted eruption of the posterior teeth and bite opening for deep bite problems. Total active treatment duration and chairside time are decreased significantly.
Methods: Subjects of the study were 40 individuals (28 females, 12 males) with Class II, Division 1 deep bite malocclusion and average age of 9.84±1.24 years; referring to departments of orthodontics and pedodontics of Shahid Beheshti dental school or private sector. Seifi functional was administered for minimum 6 months with average of 10.2±2.01 month. Cephalometric measurements and efficacy of the appliance were evaluated and compared by Paired T test.
Results: Seifi functional is capable of increasing SNB, Facial angle, Mandibular length, Ramus length, L6-MP, and Mentolabial sulcus significantly. In addition, a significant decrease was shown in Overjet, ANB, AB diff., U1-SN, and Overbite (p<0.05). However, increase in SN-GoGn, MP-SN, IMPA, ANS-Me/N-Me, Co-ANS, Li/E plane and decrease in SNA, PFH/AFH were not significant (p>0.05). First molar relationships were improved significantly. Decreasing the chair time (eliminating the acrylic grinding) and diminishing the treatment duration by taking maximum advantage of simultaneous three dimension corrections i.e. sagittal, vertical, and transverse were significant (p<0.05).
Conclusions: By application of the Seifi functional, mandible is located in a more forward position and neuromuscular systems gradually adapts to the new functional position which leads to bone remodeling and skeletal changes in sagittal dimension. Mandible in unlocked by opening the jack screw that increase the arch width in maxillary constriction cases and better arch coordination is achieved after inter-canine and inter-molar expansion. Occlusion is discluded by acrylic thickness capping of the lower incisors, plus lack of any retentive clasps on the lower posterior teeth cause unrestricted eruption of the posterior teeth and bite opening for deep bite problems. Total active treatment duration and chairside time are decreased significantly.