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HARD TISSUE CHARACTERISTICS OF CLASS II DIVISION 1 MALOCCLUSIONS WITH FOUR PREMOLARS EXTRACTION BY EVALUATE PRE-TREATMENT LATERAL CEPHALOMETRIC RADIOGRAPHY
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Abstract
Objectives: To evaluate the pre- treatment cephalometric characteristics of hard tissue of class II division 1 malocclusions with four premolars extraction. Materials and method: Descriptive study of 31 patients (21 females, 10 males) diagnosed with class II division 1 malocclusion with four premolars extraction in School of Odonto- Stomatology and National Hospital Of Odonto- Stomatology to June 2021 were recruited. Results: The average of age was 18,65 (range in 11 to 34). Normal SNA angle 83,74 ± 3,400. Retruded mandibular and Pogonion point with SNB angle 77,13 ± 3,710 and NPog- FH angle 85,23 ± 3,750 were less than normal range. Mandible angle was greater showed a generalized tendency towards a more vertical skeletal growth pattern. The greater ANB angle 6,580 and Wits appraisal 2,73 mm. Severe bimaxillary proclination in relation to anterior cranial base, palatal plane and mandible plane. Interincisal angle 109,79 ± 8,080 was less than normal. Large overjet was 5,75 ± 3,08 mm. Conclusions: In this study, class II division 1 malocclusions with four premolars extraction have normal maxillary- cranial base relationship with normal SNA angle, retruded mandibular and chin with less SNB and NPog- FH angles. The sample showed a generalized tendency towards a more vertical skeletal growth pattern. Greater ANB angle and Wits appraisal showed anterior- posterior discrepancy. Bimaxillary proclination with smaller interincisal angle and large overjet.
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Keywords
hard tissue, class II division 1 malocclusion, cephalometric, premolar, extract
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