Biomedical subjects
Publications and source records attributed to L Deblock.
Jaw equilibrium is one of the most important goal to achieve, during orthodontic treatment. The clinical diagnosis of discal dislocations allows to track them systematically and avoids many dysfunctions which are responsible of relapses.
Discal dislocations are not enough defined by the mandibular opening diagram. Understanding the anatomical phenomena surely helps to improve diagnosis. However, localizing the medial sagittal plane and the incisor midlines is of real importance to develop solutions, from a treatment standpoint.
The aim of this study is to know the repercussions of modified sagittal ramus split osteotomy of the mandible on the anamnesic symptoms of cranio-mandibular disorders in 89 patients. The sample was divided into different groups according to the surgery type: mandibular advancement or mandibular retrusion with or without maxillary surgery. The anamnesic approach allows to evaluate the felt symptoms. All had a surgery by the same surgeon and with the same technique: mandibular sagittal bilateral surgery according to the modificated Obwegeser osteotomy. The statistical analysis shows some differences between groups.
During orthodontic displacement, integrity of root and periodontis needs the knowledge of forces systems developed by orthodontic appliances. Analyses of different tooth movement require some biomechanic rules especially to choose magnitude and direction of forces, with respect to the center of resistance and the C/F ratio. Forces systems developed by the Burstone segmented arch technique have to be shown biologic because they produce light and variable pressures according to patient age and rate of periodontal disease.
Heavy posterior orthopedic forces used for massive retropositioning of maxillary bone are among the orthopedic treatments preconised during mixed dentition. The clinical and cephalometric results of twelve cases treated by these means indicate that only dental movements can be obtained without the possibility of any orthopedic remodeling. These results corroborate those of other studies and it is possible to conclude that heavy orthopedic forces represent a very imprecise therapy which lead to side effects that are greater than the desired objectives.
Growth induces very important modifications of the skeletal positions of the maxilla and the mandible and the precise position of the teeth is not foreseeable before an attempt to evaluate the situation the bones will be in by the end of the treatment has been made. Predictability factors are examined and a specific construction of V.T.O. is suggested. Then a new superposition is proposed which allows to determine the direction and range of teeth displacements.
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