Effects of relapse forces on periodontal status of mandibular incisors following orthognathic surgery.
ABSTRACT In this case-control study, the relationship between the relapse forces and periodontal changes in the mandibular incisor region were investigated following orthognathic surgery.
Mucogingival and alveolar changes in 36 subjects with mandibular prognathism were analyzed by clinical and roentgenographic methods just before mandibular setback surgery and 7.4 months postoperatively. The results were compared to two control groups: 36 subjects with no orthodontic history and 33 orthodontic patients. The mean age of the 105 subjects was 20.21 years.
The intergroup comparisons showed significant differences in all parameters, except for the plaque index and alveolar height measurements. By an incisor proclination of 3.3 mm and a tipping of +8.5 degrees (postoperative relapse: 0.8 mm and 0.14 degrees ), the surgery group revealed significant changes in single parameters of both alveolar height and sulcus depth measurements.
Compared to both control groups, the preoperative periodontal condition of the surgery patients was less acceptable than in the orthodontically treated patients, whereas subjects without braces presented the most ideal hygienic conditions. In the short term, the decompensation process prior to mandibular setback surgery did not affect periodontal structures significantly, and the current study did not find any negative effects of early postoperative relapse forces on the mandibular incisor area.
Conference Paper: Spectral shaping for the hearing impaired[Show abstract] [Hide abstract]
ABSTRACT: A method is presented for shaping the audio spectrum to improve intelligibility for the hearing impaired. Actual audiological data is used to design a finite impulse response digital filter using the frequency sampling method. Cubic spline interpolation is used to generate any number of frequency samples from the limited number available from the audiological dataSoutheastcon '96. 'Bringing Together Education, Science and Technology'., Proceedings of the IEEE; 05/1996
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ABSTRACT: Orthodontic treatment aims at providing an acceptable functional and aesthetic occlusion with appropriate tooth movements. These movements are strongly related to interactions of teeth with their supportive periodontal tissues. In recent years, because of the increased number of adult patients seeking orthodontic treatment, orthodontists frequently face patients with periodontal problems. Aesthetic considerations, like uneven gingival margins or functional problems resulting from inflammatory periodontal diseases should be considered in orthodontic treatment planning. Furthermore, in cases with severe periodontitis, orthodontics may improve the possibilities of saving and restoring a deteriorated dentition. In modern clinical practice, the contribution of the orthodontist, the periodontist and the general dentist is essential for optimized treatment outcomes. The purpose of this systematic review is to highlight the relationship between orthodontics and periodontics in clinical practice and to improve the level of cooperation between dental practitioners. Potentials and limitations that derive from the interdisciplinary approach of complex orthodontic-periodontal clinical problems are discussed.Journal of Oral Rehabilitation 02/2010; 37(5):377-90. · 2.34 Impact Factor