Comparative analysis of the relationship between basal bone and teeth in normal occlusion and Angle's Class I malocclusion / 대한치과교정학회지

ABSTRACT

In order to analyze the relationship between teeth and basal bone for the maintainance of the good occlusion, the mesiodistal width of teeth, the basal arch width and the basal arch length were measured on the study model of the normal occlusion group and Angle's class I malocclusion group(non-extraction group, extraction group). The Maximum tooth material, the percentage of basal arch width to maximum tooth material, the percentage of basal arch length to maximum tooth material and the percentage of basal arch width plus basal arch length to maximum tooth material were calculated, and then statistical analysis was done. From this study, the obtained results were as follows; 1. In maxilla, the percentage of basal arch width to maximum tooth material was 46.9+/-2.6% in normal occlusion group, 49.4+/-3.9% in non-extraction group, and 42.5+/-3.3% in extraction group. In mandible, that was 46.6+/-2.4 % in normal occlusion group, 47.5+/-4.0% in non-extraction group, and 42.6+/-2.6% in extraction group. 2. In maxilla, the percentage of basal arch length to maximum tooth material was 33.4+/-1.9% in normal occlusion group, 33.9+/-1.8% in non-extraction group, and 28.7+/-2.5% in extraction group. In mandible, that was 34.4+/-4.3% in normal occlusion group, 36.5+/-1.9% in non-extraction group, and 31.5+/-2.5% in extraction group. 3. In maxilla, the percentage of basal arch width plus basal arch length to maximum tooth material was 80.3+/-3.4% in normal occlusion group, 83.3+/-4.8% in non-extraction group, and 71.2+/-4.3% in extraction group. In mandible, that was 81.0+/-5.2% in normal occlusion group, 84.0+/-5.4% in non-extraction group, and 74.1+/-4.1 % in extraction group. 4. In Maxilla, the 95% confidence interval of the percentage of basal arch width to maximum tooth material was 46.3-47.5% in normal occlusion group, 48.1-50.7% in non-extraction group, and 41.7-47.2% in extraction group. In mandible, that was 46.1-47.2% in normal occlusion group, 46.1-48.8% in non-extraction group, and 42.0-43.3% in extraction group. 5. In maxilla, the 95% confidence interval of the percentage of basal arch length to maximum tooth material was 32.9-33.9% in normal occlusion group, 33.3-34.5% in non-extraction group, and 28.1-29.2% in extraction group. In mandible, that was 33.4-3.4 % in normal occlusion group, 35.8-37.2% in non-extraction group, and 30.9-33.1% in extraction group. 6. In maxilla, the 95% confidence interval of the percentage of basel arch width plus basal arch length to maximum tooth material was 79.5-81.0% in normal occlusion group, 81.6-84.9% in non extraction group, and 70.1-72.2% in extraction group. In mandible, that was 79.8-82.2% in normal occlusion group, 82.1-85.5% in non-extraction group, and 73.1-75.1% in extraction group. 7. There was correlation between maxilla and mandible in the maximum tooth material, the basal arch width, the basal arch length, the percentage of basal arch width to maximum tooth material, the percentage of basal arch length to maximum tooth material and the percentage of basal arch width plus basal arch length to maximum tooth material, but not in the basal arch length of male of the extraction group. *A thesis submitted to the Council of the Graduate School of Kyungpook national University in partial fulfillment of the requirements for the degree of Master of Dental Science in December, 1991.