Treatment outcomes of orthodontic treatment, corticotomy-assisted orthodontic treatment, and anterior segmental osteotomy for bimaxillary dentoalveolar protrusion.
ABSTRACT The purpose of this study was to compare treatment outcomes of orthodontic treatment, anterior segmental osteotomy, and corticotomy-assisted orthodontic treatment for resolution of bimaxillary dentoalveolar protrusion.
The samples consisted of 65 Korean adult female patients with bimaxillary dentoalveolar protrusion who had achieved a good treatment result and were divided into group 1 (orthodontic treatment), group 2 (corticotomy-assisted orthodontic treatment with skeletal anchorage in the maxilla and anterior segmental osteotomy in the mandible), or group 3 (anterior segmental osteotomy in the maxilla and mandible). The hard- and soft-tissue variables were measured from lateral cephalographic tracings at pretreatment and posttreatment stages. Statistic analyses were performed to compare differences in pretreatment and change from pretreatment to posttreatment.
Group 3 showed the largest amount of basal bone retraction and the least amount of upper incisor inclination change and upper alveolar bone bending among the three groups. The amounts of change in the upper lip projection and angulation were greater in group 2 than in group 1. Group 3 showed a decrease of the upper incisal exposure, whereas group 1 showed an increase. Upper central incisor to Frankfurt horizontal plane, upper and lower alveolar ridge angle, Pog-N perpendicular, and anteroposterior discrepancy indicator were selected as significant variables for discriminating the three groups.
The results of this study show that orthodontic treatment or corticotomy-assisted orthodontic treatment is indicated for those with severe incisor proclination with normal basal bone position, although corticotomy-assisted orthodontic treatment can be advantageous for adult patients concerned with treatment duration. Anterior segmental osteotomy is recommended for bimaxillary dentoalveolar protrusion patients with a gummy smile, basal bone prognathism, relatively normal incisor inclination, and relatively underdeveloped chin position.
- American Journal of Orthodontics 07/1974; 65(6):586-611.
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ABSTRACT: Thirty bimaxillary protrusion cases, who had four first premolars extracted were compared with thirty Class I malocclusion cases who, likewise, had similar extractions and treatment. The changes, both in incisor relationships and the concurrent soft tissue profiles are documented. During treatment, the inter-incisal angle was increased by 20 degrees and relapsed by 4 degrees post-treatment. The protuberance of the soft tissue profile was significantly reduced by 4 degrees concurrently (Holdaway Angle). It is concluded that worthwhile treatment objectives can be achieved in these cases.British journal of orthodontics 11/1986; 13(4):209-20.
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ABSTRACT: 1. Cephalograms of 102 children with normal occlusion (Group 1) and 874 children with various malocclusions were analyzed to determine which measurements would produce the highest correlation against the displacement of the molar relationships. 2. Molar displacement was measured directly on the study casts, and an average of the measurements of the right and the left sides was obtained. 3. The malocclusion sample was divided into groups according to molar displacement: 214 neutroclusion cases (Group 2), 624 distoclusion cases (Group 3), and 36 mesioclusion cases (Group 4). 4. The mean value of the anteroposterior dysplasia indicator (APDI) in the normal group was 81.4 degrees, with a standard deviation of 3.79. 5. The APDI reading was obtained by tabulating the facial angle plus or minus the A-B plane angle and plus or minus the palatal plane angle. 6. Among the measurements tested, the APDI was found to show the highest correlation against the molar displacement, with a correlation value of 0.643. 7. The four variable that produced the highest correlation coefficient value--that is, the ANB angle (-0.495), the A-B pland angle (0.566), the "Wits" appraisal (-0.639), and the APDI (0.643)--were subjected to a study of their frequency distribution patterns. High percentage of overlapping of the two extreme groups (distoclusion and mesioclusion groups) were found in the above variables, with the exception of the APDI. 8. A discussion of the differential diagnostic value of the APDI was presented, together with illustrations and various clinical examples.American Journal of Orthodontics 07/1978; 73(6):619-33.