ABSTRACT
Objective: To detect the clinical effect of T win-Block appliance in the treatment of the patients with Class II division 1 malocclusion, and to provide the basis for clinical treatment. Methods: A total of 30 patients with class II division 1 malocclusion were treated with Twin-Block appliance. The variables of the patients before and after treatment were measured with Ricketts cephalometric radiographys. Results: Compared with before treatment, the length of corpora mandibulae (Xi-Pm) of the patients after treatment was increased by 2. 50 mm (P<0. 05), the SNB angle was increased by 2. 58° (P<0. 05), and the ANB was decreased by 2. 71 (P<0. 01); the molar relationship distance and the Overjet were decreased by 2. 81 mm and 3. 68 mm, respectively (P<0. 01); the Ll-OP was decreased by 1.89 mm, the distance of Ll-APog was increased by 1.84 mm, and the angle Ul-APog was decreased by 7. 35° (P<0. 01); the Ls-TVL was increased by 1. 85 mm, the Sm-TVL was increased by 2. 12 mm (P<0. 05), and the Pos-TVL was increased by 2. 89 mm (P<0. 05). Conclusion: The Twin-Block appliance could obviously promote the development of mandibular bone, upright the anterior teeth and improve the lip angle of upper anterior teeth and the proflie in the treatment of the patients with class II division 1 malocclusion in the growth development period.
ABSTRACT
OBJECTIVE: This study was designed to define the Korean norm values for the Ricketts analysis. METHODS: In this longitudinal study, lateral cephalograms of 31 subjects with normal occlusion were taken biennially from ages 9-19 years. Cephalometric measurements were performed. Parameters for which the 10-year change did not exceed one standard deviation were defined as unchanged. The means and standard deviations for the measured parameters were determined for each age group. RESULTS: No significant changes in growth were observed in the molar relationship, incisor overjet, incisor overbite, mandibular incisor extrusion, interincisor angle, lower incisor tip (B1) to A point-Pogonion (A-PO) plane, upper incisor tip (A1) to A-PO plane, B1 inclination to A-PO, A1 inclination to A-PO, B1 inclination to Frankfurt plane (FH), convexity, lower facial height, facial axis, maxillary depth, maxillary height, palatal plane to FH, cranial deflection, ramus Xi position, or porion location. Continual changes over the 10 years of growth were observed in the maxillary first molar distal position to pterygoid true vertical plane, facial depth, mandibular plane to FH, anterior cranial length, mandibular arc, and corpus length. CONCLUSIONS: Clinicians can apply the Korean norms at age 9 as determined in this study when using the Ricketts analysis. The patient's age at the beginning of treatment and their sex should be taken into consideration when drawing visual treatment objectives.
Subject(s)
Humans , Axis, Cervical Vertebra , Growth and Development , Incisor , Longitudinal Studies , Molar , OverbiteABSTRACT
The purpose of this study was to evaluate the parts of discrepancy on orthognathic surgical cases with skeletal Class III malocclusion. For this study, Ricketts' analysis that has suggested visual treatment objective, as named for growth predictable blue print, was used. The results of this study were as follows: 1. In the denture problem, mandibular incisor and molar was positioned more anteriorly in Class III malocclusion. 2. The location of A point was characteristically posteriorly positioned in the Class III group, and mandible plane angle was within normal range in the groups. 3. Position of upper and lower anterior teeth to A-Pogonion line was anteriorly positioned, and angulation of upper anterior tooth was lingually positioned in the Class III group, but angulation of lower anterior tooth was not significant in the both groups. 4. Esthetic line of Ricketts' analysis was not significant statistically. 5. Facial depth and axis was larger, but facial taper(facial plane mandible plane) was smaller in the Class III group. So, protruded and concave profile was seen in the Class III group. 6. Cranial deflection was larger in the Class III male group, ramus location was anteriorly positioned and mandibular length was enlarged in the male and female of Class III group.
Subject(s)
Female , Humans , Male , Axis, Cervical Vertebra , Dentures , Incisor , Malocclusion , Mandible , Molar , Reference Values , ToothABSTRACT
The purpose of this study was to assess the skeletal characteristics of the maxillofacial norms and the interpretation of craniofacial relations in Korean adults by applying the Ricketts Analysis. The factors of the applied lateral cephalometric measurements were composed of the 10 factor analysis (Summary Analysis) and 7 internal structures to be suggested by Ricketts. Lateral cephalograms were obtained from 60 subjects over 21 years old that consisted of 30 males and 30 females with normal occlusion, acceptable profile. The results were as follow: 1. The tables of means, standard deviations in each item and sex were made. 2. The author performed whether there was significance (P<0.05) between the registered male and female's measurement in each item.