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Biomedical subjects

W H Bell

Publications and source records attributed to W H Bell.

At least 127 records · Page 7Linked to original sources
PubMed1977

Surgical correction of the atrophic alveolar ridge. A preliminary report on a new concept of treatment.

Inferior repositioning of the atrophic maxillary edentulous alveolar ridge by LeFort I osteotomy and simulataneous bone grafting, and superior repositioning of the atrophic mandibular edentulous ridge by horizontal osteotomy of the mandibular body and simultaneous bone grafting have been accomplished successfully. These two new surgical procedures add a new dimension to treatment of severe atrophy of the alveolar ridges in edentulous or partially edentulous patients.

Adult↗
PubMed1977

Correction of the long face syndrome by Le Fort I osteotomy. A report on some new technical modifications and treatment results.

The combined efforts of multiple specialists are needed for the successful treatment of patients with the long face syndrome. The plan of therapy is designed to correct the individual's dentofacial deformity and achieve the best possible occlusion and facial esthetics. Reduction of facial height by surgical means and proper alignment of the teeth by orthodontic and restorative procedures are the common denominators of successful treatment. By properly planned and executed Le Fort I maxillary osteotomies, the vertical dimension of the face can be shortened to improve the esthetic balance between the nose, upper lip, teeth, and chin and to achieve lip competency. Moreover, the transverse and anteroposterior discrepancies can be simultaneously corrected. Various open-bite and non-open-bite maxillary deformities in forty-one adults with the long face syndrome were corrected by Le Fort I osteotomy, orthodontic treatment, and restorative procedures. The technical problems in planning and executing treatment are discussed and illustrated by selected case reports.

Adolescent↗
PubMed1977

Correction of maxillary excess by anterior maxillary osteotomy. A review of three basic procedures.

With proper planning, execution, and follow-up care, the anterior maxilla can be surgically repositioned in selected cases to correct the anteroposterior, vertical, and horizontal manifestations of maxillary excess. The technical problems in planning and design for the necessary bony and soft-tissue incisions for three basic anterior maxillary osteotomy techniques are discussed and illustrated. Selection of the most appropriate procedure is based upon the type of positional change that is planned.

Humans↗
PubMed1977

Correction of the short-face syndrome-vertical maxillary deficiency: a preliminary report.

Careful clinical studies and cephalometric and model analyses are required in the planning for treatment of vertical maxillary deficiency. The maxilla is repositioned inferiorly to elongate the face and to achieve facial balance. Simultaneous Le Fort I osteotomy with bone grafting is a helpful adjunct in the treatment of vertical maxillary deficiency in either dentulous or edentulous patients.

Adult↗
PubMed1977

Biologic basis for modification of the sagittal ramus split operation.

Ten adult rhesus monkeys were used as experimental models to investigate revascularization and bone healing associated with sagittal splitting of the mandibular rami by two different techniques. Microangiographic and histologic studies showed intraosseous ischemia in the margins of the osteotomized segments and areas where the pterygomasseteric sling had been detached. When the mucoperiosteum and pterygomasseteric sling were minimally detached from the proximal segment, intraosseous ischemia and necrosis were significantly reduced. The results support the use of a clinical technique of sagittally splitting the mandibular ramus, which maximizes attachment of the pterygomasseteric sling and mucoperiosteum.

Animals↗
PubMed1976

The long face syndrome: vertical maxillary excess.

There is a clinically recognizable facial morphology, the long face syndrome, which has been incompletely described in the literature. On the basis of the clinical summary in thirty-one adults with this syndrome, an analysis of esthetics, skeletal morphology, and occlusion was undertaken. Herein we report on these findings, which confirm that this basic dentofacial deformity is associated with excessive vertical growth of the maxilla. Dental open and closed bite are two variants of the syndrome. An increased mandibular ramus height is associated with the closed-bite group.

Adolescent↗
PubMed1976

Superior repositioning of the maxilla: stability and soft tissue osseous relations.

The skeletal stability and soft-tissue changes associated with superior repositioning of the maxilla by Le Fort I osteotomy or simultaneous anterior and posterior maxillary osteotomies was studied in thirty patients by means of a computerized craniofacial model. Excellent skeletal stability was demonstrated 14 months postoperatively. Postsurgically, the reduction in lower face height and amount of maxillary incisor exposure resulted in improved facial balance. The use of a computerized osseous and soft-tissue craniofacial model has added a new dimension to evaluation of surgical changes associated with correction of dentofacial and craniofacial deformities.

Adolescent↗
PubMed1976

Surgical-orthodontic expansion of the maxilla.

Selected maxillary osteotomies are safe and dependable adjuncts to treatment of bilateral and unilateral maxillary deficiency. Maxillary expansion in fifteen adults was accomplished by separating the maxillary basal bone from the nasal, zygomaticomaxillary, and pterygomaxillary buttresses.

Activator Appliances↗
PubMed1976

Soft tissue changes associated with total maxillary advancement: a preliminary study.

A retrospective investigation was performed with use of cephalometric radiographs from eight patients with anterior maxillary advancement. Soft tissue changes associated with hard tissue changes were measured. Statistical description of soft tissue behavior in the upper lip was performed using correlation coefficients, regression functions, and ratios of change in the relationship of soft tissue to hard tissue. Ratios of change in relationship of soft tissue to hard tissue for three parameters of upper lip movement are proposed for clinical use in treatment planning. Further investigation of soft tissue behavior with orthognathic surgical procedures is indicated.

Cephalometry↗
PubMed1976

Biological basis for vertical ramus osteotomies--a study of bone healing and revascularization in adult rhesus monkeys.

Fifteen adult rhesus monkeys were used as experimental models to investigate revascularization and bone healing associated with pedicled and nonpedicled vertical ramus osteotomies and to elucidate the problem of vascular ischemia of the proximal segment and healing of the osteotomized bone. Microangiographic and histologic studies of vertical ramus osteotomies in which the proximal segment was not pedicled to soft tissue showed intraosseous necrosis, vascular ischemia, and delayed healing. Similar studies of pedicled vertical ramus osteotomies showed early osseous union, minimal osteonecrosis, and minimal vascular ischemia. The results indicate that continuous circulation to the proximal segment is necessary to retain osseous viability and to support the clinical practice of pedicling the proximal condylar segment to the articular capsule and lateral pterygoid muscle.

Animals↗
PubMed1975

Soft-hard tissue correlations and computer drawings for the frontal view.

Hard and soft tissue measurements were obtained for nine Caucasian women. Based on these measurements, regression formulas were derived to approximate the soft tissue covering based on hard tissue data. The results are presented iconically by computer drawings. The preliminary data presented would suggest a definite predictable influence exerted by the facial skeleton on the position of landmarks in the overlying soft tissue.

Adult↗
PubMed1975

Bone healing and revascularization after total maxillary osteotomy.

Adult rhesus monkeys were used as experimental analogues to investigate vascularization, revascularization, and bone healing associated with total maxillary osteotomy. Microangiographic and histologic studies showed minimal transient vascular ischemia, minimal osteonecrosis, and early osseous union. Transection of the greater palatine arteries had no discernible effect on the circulation to the teeth and bone in the maxilla and its enveloping soft tissues. The results of experiments in animals and clinical studies indicate that palatal mucosa and labial-buccal gingiva provide an adequate nutrient pedicle for single-stage total maxillary osteotomies.

Angiography↗
PubMed1975

Le Forte I osteotomy for correction of maxillary deformities.

With proper planning, execution, and follow-up care, the maxilla can be surgically repositioned into a stable relationship with the mandible. Complete mobility, preservation of viability by proper design of the bony and soft tissue incisions, and adequate fixation during the healing phase are essential to obtain this objective. Variable maxillary deformities in 15 adults were corrected by Le Forte I osteotomy techniques. The technical problems in planning and design for the necessary bony and soft tissue incisions are discussed and illustrated by three case reports.

Adolescent↗