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Biomedical subjects

D S Bloomquist

Publications and source records attributed to D S Bloomquist.

13 recordsLinked to original sources
PubMed1997

The stability of the use of bilateral sagittal split osteotomy in the closure of anterior open bite.

This paper is a preliminary report on the stability of the use of bilateral sagittal split osteotomy and rigid internal fixation (2-mm bicortical screws) in the closure of anterior open bite. Ten patients who had finished orthodontic treatment and were at least 1 year out of surgery were evaluated by cephalometric analysis for dental and skeletal changes. One angular and three vertical measurements were evaluated cephalometrically at three times for each patient: immediately preoperatively, a maximum of 1 week postoperatively, and after a minimum of 12 months of follow-up. The results of this small sample seemed to indicate that the use of bilateral sagittal split osteotomy and 2-mm bicortical screws for the closure of the anterior open bite is a relatively stable procedure.

Bone Screws↗
PubMed1993

Stability of mandibular constriction with a symphyseal osteotomy.

The purposes of this study are to determine the stability of surgical mandibular constriction with a midline osteotomy and to evaluate the periodontal and temporomandibular joint responses. A symphyseal osteotomy to facilitate mandibular construction was performed in 15 patients to correct transverse discrepancies. At the same time a surgical anterior or posterior repositioning of the mandible was done by using a bilateral sagittal osteotomy of the vertical ramus. Tomograms in the coronal plane including the mandibular second molars were taken preoperatively (T1), immediately postoperatively (T2) and 8 weeks postoperatively (T3). Linear measurements between the cortical borders of the mandible were assessed from the tomograms at each time period. Median surgical and postoperative changes in mandibular width were determined. When evaluating the entire group no statistically significant change in the surgical constriction was found postoperatively (T2 and T3), although there was some individual variability. An examination of the periodontal response at the osteotomy site revealed no statistically significant change between the initial and the 5-month postoperative examinations. No changes in joint noise were detected postoperatively, and all mandibular joint movements returned to preoperative values except for excursive movements. Mandibular constriction with a midline osteotomy on conjunction with a bilateral sagittal osteotomy was found to be a stable modality for correcting transverse disharmonies.

Adolescent↗
PubMed1993

Linear and rotational changes in large mandibular advancements using three or four fixation screws.

Forty-one patients who underwent bilateral sagittal ramus osteotomy for large mandibular advancements were evaluated by retrospective cephalometric analysis for rotational and linear stability of the proximal and distal segments of the mandible. The patients were grouped by the number of screws used in fixation (three versus four 2-mm bicortical screws) and matched for the amount of advancement measured from changes in mandibular body length. The group with four fixation screws did receive significantly larger advancements relative to the cranial base than did the group with three screws. However, the pattern of postoperative change was similar for the two groups. There was no higher rate of relapse seen in those patients with high mandibular plane angles, genioplasties, mandibular constriction with a symphyseal osteotomy, or open bites preoperatively, nor did the number of screws used in fixation affect changes seen in those patients. Factors associated with both relapse and continued postoperative movement in the direction of advancement independent of the screw fixation group were identified.

Adult↗
PubMed1990

Case report MM. Surgical-orthodontic correction of bilateral buccal crossbite (Brodie syndrome)

A surgical approach to treatment was required for this 35-year-old patient to correct a malocclusion characterized by a bilateral buccal crossbite. Surgical procedures included a LeFort 1 osteotomy to reduce maxillary width and correct the vertical asymmetry. The mandible was lengthened with a bilateral sagittal split osteotomy. Treatment options for the nongrowing patient are limited in the correction of severe skeletal disharmonies.

Adult↗
PubMed1989

Stability of mandibular lengthening using bicortical screw fixation.

The mandibular lengthening procedure performed with the use of rigid internal fixation yields more stable results than previously demonstrated when nonrigid fixation is used. Twenty patients with Class II malocclusion who had undergone this procedure were examined retrospectively to assess postoperative skeletal change. The mean postoperative interval was 15.7 months. Although there was individual variability, no significant mean postoperative horizontal change was found, which indicated excellent stability.

Adolescent↗
PubMed1982

Long-term results of subperiosteal implants combined with cancellous bone grafts.

Twenty-three subperiosteal implants combined with cancellous bone grafts were done at the University of Washington over a four-year period. A modification of the original technique as used with 19 of the patients is described, as well as the follow-up evaluation. The greatest problem occurred at the mucosal-metal junction, resulting in multiple infections and some failures. This technique appears to be comparable with simple subperiosteal implant but not significantly better.

Alveoloplasty↗
PubMed1982

Mandibular body sagittal osteotomy in the correction of malunited edentulous mandibular fractures.

The severely atrophied mandible presents multiple problems in reduction and fixation when bilateral mandibular body fractures occur. These problems sometimes result in malunited fractures. The two most common malpositions in these situations include a clockwise rotation (viewed from the patient's right) of the distal fragment and/or the counter-clockwise rotation of a proximal fragment. Body sagittal osteotomy as originally described by Sáda (1966) offers some advantages in the secondary reconstruction of these mandibular deformities. Five patients with mandibular body malunions have been treated successfully with two cases used in this article to demonstrate the application of body sagittal osteotomy. Permanent damage to the inferior alveolar nerve appears minimal and no other significant problems were encountered.

Adult↗
PubMed1981

Cortical power spectrum analysis of hypnotic pain control in surgery.

Cortical power spectrum (CPS) of brain potentials was recorded from the scalp between prefrontal and parietal regions in both right hemisphere (RH) and left hemisphere (LH). A pattern of laterality shift in CPS occurred at different stages during an extensive oral surgery, performed under hypnosis, in a young female patient. Video and audio recordings as well as psychophysiological recordings were obtained through the following 6 stages: Baseline, Hypnosis, Surgery (1 hr, no cortical recording), Immediate Postsurgery Procedure, Hypnotic Re-experience, Hypnotic Rest, and Posthypnotic Baseline. Indications of anxiety and pain scores were reported in writing by the patient through verbal command by the hypnotist. In each stage, 10 min of CPS (10 spectrum/stage, 8 epochs/spectrum, 6 seconds/epoch) were analyzed by a PDP-11 computer. The results of CPS analysis demonstrated significant large total power reduction at different stages. There was significant correlation between both hemispheres at baseline, but dissociation of hemispheric power output occurred during hypnosis stages. LH was more dominant than RH during baseline and presurgery hypnosis, but both were leveled-off immediately following the surgery procedure. However, RH became more dominant during all postsurgery hypnosis stages. Interestingly, this pattern shifted back to the original relationship during the posthypnotic baseline stage. Specific changes of spectral power in theta and alpha of EEG activities in both hemispheres also occurred in conjunction with hypnosis.

Adult↗
PubMed1980

The posterior ilium as a donor site for maxillo-facial bone grafting.

The anterior iliac crest has been the traditional source of pelvic bone for autogenous bone grafting in the maxillo-facial skeleton. Although the posterior iliac crest is frequently utilized by our orthopaedic colleagues, little attention has been given this site in the oral and maxillo-facial literature. As the posterior crest affords an almost unlimited amount of bone for autogenous grafting in the maxillo-facial region, we feel its use is indicated when very large amounts of bone are required. The techniques for removal of cancellous and cortico-cancellous posterior crest grafts are described in detail. Morbidity of the posterior crest donor site includes possible difficulties with patient positioning, injury to the sacro-iliac joint, injury to the sciatic or cluneal nerves, and severe haemorrhage. Ambulation following the use of the posterior crest has not been a problem. Significant blood loss can be adequately controlled with proper exposure, electrocautery, and bone wax.

Facial Bones↗
PubMed1979

The effect of mandibular osteotomy in three patients with hypersomnia sleep apnea.

Hypersomnia sleep apnea (HSA) is characterized by apneic episodes during sleep and daytime hypersomnolence. Patients afflicted as a result of upper airway obstruction have been treated traditionally with permanent tracheostomy. Three patients with HSA and mandibular retrognathism are presented. Each patient had a retrognathic mandible that stemmed from a different cause. Surgical advancement of their underdeveloped mandibles corrected the symptoms of HSA rapidly. The literature concerning HSA is reviewed and the advantages of mandibular surgery in selected cases are discussed.

Child↗