The Word is Near You Bekken, Per Jarle
2012, 2007, 2007-01-01, Volume:
144
eBook
The series Beihefte zur Zeitschrift für die neutestamentliche Wissenschaft (BZNW) is one of the oldest and most highly regarded international scholarly book series in the field of New Testament ...studies. Since 1923 it has been a forum for seminal works focusing on Early Christianity and related fields. The series is grounded in a historical-critical approach and also explores new methodological approaches that advance our understanding of the New Testament and its world.
Purpose: The morphological evaluation of the mandible is done on the basis of linear and angular analysis by using two-dimensional radiographs. However, from the two dimensional analysis, we cannot ...find out the character and actual size of the mandible. The purpose of the study is to establish the method of volumetric analysis of individual for growth prediction and compare with the two dimensional analysis. Also measure the total bone volume and distinguish the quality and quantity of bone by its density. Material and Method: 1. CBCT measurement: Thirty-three adult patients' cone beam computed tomography (CBCT) was taken by the CB MercuRay (Hitachi Medical Corporation, Chiba, Japan) at 120 kV and 15 mA. The DICOM data were segmented in order to separate the mandible by the software Amira Resolve Rt 4.0 (Konrad-Zuse-ZIB Berlin, Germany and TGS, USA). The mandible was then labeled on a selective threshold automatically and condyle was labeled manually. Then the mandible was reconstructed and following things were measured: A) Total Bone Volume (TBV). B) High Density Bone Volume (HDBV). C) Low Density Bone Volume (LDBV). 2. Cephalometric measurement: Same subjects' linear and angular analysis for mandible. 3. Statistical analysis. Result: 1. No significant correlation between volumetric analysis and the cephalometric analysis. 2. The positive significant correlation was found between the TBV and HDBV, TBV and LDBV. 3. No significant correlation between HDBV and LDBV. Conclusion: The results of the 3D volumetric analysis have no similarity with the results of 2D analysis. So, 2D analysis is not enough to evaluate the size, shape and quality of the mandible. The TBV is related with HDBV and LDBV. But there is no relation between HDBV and LDBV. Then if we are able to find out the relationship among the high density bone volume, low density bone volume and other factors like occlusal force, masticatory pattern it will be possible to resolve the growth characteristic by volumetric analysis. In future, longitudinal volumetric measurement will give us better accuracy for the growth prediction. Thus; this kind of analysis would enable the 3D biomechanical orthodontic diagnosis and the effective growth control and modification by using functional appliances.
