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Biomedical subjects

R J Fonseca

Publications and source records attributed to R J Fonseca.

At least 37 records · Page 2Linked to original sources
PubMed1989

The transmandibular implant: a 2-year prospective study.

Thirteen consecutive patients with complaints of dysfunction and pain associated with a mandibular denture were treated with the transmandibular implant. The implant was placed from a submental approach with an atraumatic surgical technique. No load was placed on the implant for 12 weeks. Patients were evaluated for pain, paresthesia, healing of the submental wound, soft tissue response, radiographic change, and mobility of the implant for a period of 2 years. Patient satisfaction was recorded at the 1- and 2-year examinations. The results demonstrate the reliability and reparability of the transmandibular implant system.

Adult↗
PubMed1989

Multicenter follow-up study of the transmandibular implant.

The purpose of this multicenter study was to review the results of treatment and identify complications in edentulous patients who were treated with the transmandibular implant. A total of 190 patients were treated in four university departments. These patients presented for treatment with mandibular bone heights that ranged from 4 to 18 mm (mean, 10 mm). After postoperative periods that ranged from 3 months to 5 years, 182 of the 190 implants (95.8%) were stable and functional. Three implants were removed due to perioperative fractures in mandibles with 4 to 6 mm of bone height. Five were removed due to infection which occurred within the first 3 months after surgery. Reversible complications that developed in 22.2% of the patients were treated successfully. The 182 implants in function demonstrated no mobility and no infrabony pockets around any of the transmucosal posts. The results of this study demonstrate that the transmandibular implant has acceptable predictability and reliability for reconstruction of patients with severe atrophy of the mandibular alveolar process.

Bone Resorption↗
PubMed1988

Treatment of chronic drooling: a preliminary report.

Chronic drooling can be both psychologically and physically damaging. The technique of sialodochoplasty with sublingual gland resection is a viable treatment modality for this problem. The results of a series of eight patients who underwent the procedure are reported. A short-term success rate of 75% was achieved without morbidity.

Adolescent↗
PubMed1988

The effect of antenatal surgery on postnatal palatal growth in sheep.

It has been suggested that repair of skin and mucosal wounds carried out in animals in utero leaves little or no trace of the operative procedure when examined at birth. This study examined the palates of lambs affected surgically in utero postnatally for scarring and transverse palatal growth. Nineteen pregnant sheep were affected at 120 days gestation. Surviving lambs followed for 6 months demonstrated altered palatal morphology.

Animals↗
PubMed1988

Stability of simultaneous maxillary intrusion and mandibular advancement: a comparison of rigid and nonrigid fixation techniques.

This study examines the short-term stability of bimaxillary surgery following Le Fort I impaction with simultaneous bilateral sagittal split osteotomies and mandibular advancement using two standard techniques of postsurgical fixation. Fifteen adults had skeletal plus dental maxillomandibular fixation, and fifteen adults had rigid internal fixation using bone plates in the maxilla and bicortical bone screws between the proximal and distal segments in the mandible. The group with rigid internal fixation did not undergo maxillomandibular fixation. Radiographic cephalograms were analyzed during the postsurgical period to evaluate skeletal and dental stability. There was no statistical difference in postsurgical stability with rigid internal fixation or skeletal plus dental maxillomandibular fixation other than the vertical position of the maxillary molar; the skeletal plus dental maxillomandibular fixation group had a significant amount of postsurgical intrusion of the maxillary molar when compared with the rigid internal fixation group. Although the other measures showed no statistically significant difference between the experimental groups, the amount of variability in postsurgical stability in the group with skeletal plus dental maxillomandibular fixation was greater than that found in the group with rigid internal fixation.

Bone Plates↗
PubMed1987

Particulate allogeneic bone grafts into maxillary alveolar clefts in humans: a preliminary report.

The purpose of this study was to determine the ability of particulate allogeneic bone graft to adequately bridge unilateral maxillary alveolar clefts in humans. Twenty patients with unilateral alveolar clefts and oronasal fistula underwent alveolar cleft grafting with a clinically appropriate amount of particulate allogeneic bone. The grafted cleft area was followed radiographically for three to six months postsurgery. Although it was difficult to quantitate, it was both clinically and radiographically apparent at three months that bone bridging and filling of the cleft had occurred in 100% of the cases. From this study, it appears that allogeneic bone is a viable alternative for repairing alveolar clefts and that its use has a significant benefit to the patient by eliminating the morbidity of a second operative site.

Adolescent↗
PubMed1984

Preoperative nutritional supplementation for the orthognathic surgery patient.

Orthognathic surgery patients were studied to determine the nutritional adequacy of a high-calorie liquid supplement. The supplements were given for one month before surgery in an attempt to achieve a 5% weight gain and/or for six weeks after surgery to approximate 50% of the estimated caloric requirements of the patients. It was concluded that preoperative supplementation to achieve weight gain before surgery is of no apparent value. However, balanced nutrient intake can be achieved for patients when supplementation is given postoperatively at a level of 50% of estimated caloric requirements, and can result in improved nitrogen retention and protein sparing.

Adult↗
PubMed1983

Revascularization and healing of onlay particulate allogeneic bone grafts in primates.

Particle size of allogeneic bone grafts was investigated to determine its effect on revascularization and healing. Freeze-dried chips of different sizes were placed on the monkey lateral mandibular cortex, and the subsequent healing and revascularization were studied by histologic, autoradiographic, and microangiographic techniques. It appears that allogeneic bone is a reasonable substitute for autologous bone in mandibular ridge augmentation procedures.

Animals↗
PubMed1983

Comparison of the healing and revascularization of onlayed autologous and lyophilized allogeneic rib grafts to the edentulous maxilla.

The healing and revascularization of onlayed autologous and lyophilized allogeneic rib grafts to the edentulous maxilla in the Macaca fascicularis monkey were studied using clinical, histologic, and microangiographic methods at varying intervals of up to eight months. Results indicated that healing and revascularization were similar but resorption of the allografts occurred approximately three months later than resorption of the autografts. Both grafting systems appeared to have minimal osteogenic potential. Osteoinduction and the final bony augmentation obtained were less than were seen with comparable autologous and allogeneic interpositional grafts.

Alveolar Ridge Augmentation↗
PubMed1982

A retrospective study of alveolar cleft grafting.

A surgical technique for the bone graft repair of alveolar clefts is described, and an evaluation of the conditions of 30 patients who have undergone that procedure is reported. Evaluation was made specifically for the preoperative and postoperative presence of oronasal fistula, postoperative eruption of previously unerupted teeth into the graft, soft and hard tissue periodontal status, and radiographic evidence of bone fill in the previous cleft defect resulting in alveolar segmental stabilization.

Adolescent↗
PubMed1982

Healing of interpositional allogeneic lyophilized bone grafts following total maxillary osteotomy.

Healing of allogeneic lyophilized bone grafted to total maxillary osteotomy sites was studied in Macaca fasciularis monkeys using histologic, microangiographic, and autoradiographic methods. Results of the study indicate that allogeneic lyophilized grafts are slowly replaced by host bone. Revascularization around the margins of the graft becomes evident at two weeks and increases until eight weeks; a hypervascular response is still present at six months. The palatal mucosa and facial gingiva provide an adequate nutrient pedicle for interpositional allogeneic grafts.

Alveolar Ridge Augmentation↗