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Biomedical subjects

D B Tuinzing

Publications and source records attributed to D B Tuinzing.

At least 55 records · Page 3Linked to original sources
PubMed1996

Occlusal and functional conditions after surgical correction of anterior open bite deformities.

The dental occlusion and alterations in orofacial muscles were studied in 267 patients whose severe anterior open bite had been treated with a Le Fort 1 intrusion osteotomy with or without an advancement sagittal split osteotomy about 6 years ago. Only 17% of those patients showed anterior contact, and 20% had no vertical overlap of mandibular and maxillary central incisors at all. Tongue position, activity of masticatory muscles, lip competence, lip-incisor relationship, and breathing mode were assessed. Statistically significant correlations were found between tongue positions and occlusion in both the anterior and the posterior regions. In addition, the activity of the masticatory muscles, habitual mouth posture, and interlabial distance were each significantly correlated to overbite, open bite, and overjet. The interlabial distance was also significantly correlated with both breathing mode and mentalis muscle activity. The activity of the masticatory muscles was negatively correlated with tongue position.

Adaptation, Physiological↗
PubMed1995

Screw fixation following bilateral sagittal ramus osteotomy for mandibular advancement--complications in 700 consecutive cases.

The use of transbuccal positional screws for stabilisation of bony segments following bilateral sagittal split osteotomy for mandibular advancement was assessed in 700 consecutive cases. In 19 patients (2.7% of cases) screw fixation was not used as the method of fixation. Screw removal was performed in 20 patients (2.8% of cases), in 15 cases due to infection and 5 cases for diverse reasons. The incidence of inferior alveolar nerve damage was increased when compared to a group of patients managed with intermaxillary fixation following advancement BSSO treated in the same unit. In 4 patients (0.6%) a lingual nerve dysaesthesia occurred. Screw loosening in the first postoperative week occurred in 4 patients and in 3 of these re-operation was necessary. Extra oral scar formation did not give rise to any significant problems.

Bone Screws↗
PubMed1994

Condylar resorption in orthognathic surgery. The role of intermaxillary fixation.

Condylar resorption that occurs after orthognathic surgery was investigated in a large sample of patients treated in the Department of Oral and Maxillofacial Surgery of the Free University in Amsterdam, the Netherlands. The findings correspond with previous publications on this subject. In a 1-year follow-up study the role of intermaxillary fixation was investigated radiologically. In a group of 158 patients prone to show occurrence of condylar resorption, 24 (26.4%) of the 91 patients treated with intermaxillary fixation showed signs of condylar resorption. In the group of 67 patients treated without intermaxillary fixation only eight (11.9%) of the patients showed signs of reduced volume of the condyle. Avoidance of intermaxillary fixation seems to reduce the incidence of condylar resorption after orthognathic surgery in patients with a mandibular deficiency with high mandibular plane angle.

Adolescent↗
PubMed1994

Computed tomography in evaluation of early secondary bone grafting.

Computed tomography (CT) was used to determine the fate of the bone graft in cleft lip and palate patients. Eight right-sided unilateral cleft lip and palate patients from the Free University Hospital in Amsterdam, treated with early, secondary bone grafting, were evaluated immediately after the operation and 1 year postoperatively. Approximately 70% of the volume of transplanted iliac crest bone was still present in the cleft area after 1 year.

Bone Resorption↗
PubMed1994

A comparative in vitro study on fixation of sagittal split osteotomies with Würzburg screws, Champy miniplates, and Biofix (biodegradable) rods.

A bilateral sagittal split osteotomy was performed on seven fresh cadaver mandibles. Three different systems of fixation were mechanically tested on 14 sites. Tensile diagrams were obtained in which the (offset-) yield point was measured. This resulted in mean yield stresses of 199 N for bi-cortical self-tapping screws (n = 6), 49 N for miniplates with monocortical screws (n = 5), and 113 N for bi-cortical biodegradable rods (n = 3).

Analysis of Variance↗
PubMed1993

Stability of the osteotomy site following bilateral sagittal split osteotomy: screw fixation v IMF.

In a group of patients with mandibular deficiency with a low to normal mandibular plane angle (mean 20.7 degrees, range 10-28 degrees) and deep bite, the position of the condylar segment relative to the mandibular body, following bilateral sagittal split osteotomy (BSSO) for mandibular advancement was assessed. Ten patients in whom intermaxillary fixation (IMF) was used for a 5-week period were compared to 10 patients where 2 mm diameter Wurzburg positional screws were used as internal fixation. Six patients who were known bruxists and underwent BSSO were also reviewed. No clinically significant changes were seen in any patient group and no significant differences were found in the relationship with time between the condylar and body segments, irrespective of the fixation method used.

Adolescent↗
PubMed1993

TMJ performance and behaviour in patients more than 6 years after Le Fort I osteotomy.

Sixteen non cleft patients treated by one piece Le Fort I osteotomy were investigated for TMJ symptoms. Clinical examination and subjective assessment by the patients was used over a 6-year period. No increase in symptoms was recorded in the osteotomy group as compared to the general population, however, condylar atrophy was seen in two patients. Both of these patients were classified as high mandibular plane angle, with absolute mandibular retrognathism. This suggests that this group may be at greater risk of condylar atrophy.

Adult↗
PubMed1992

[Pericoronitis].

Explore the source record for details and available documents.

Humans↗
PubMed1991

Orthognathic surgery for mentally retarded patients.

The surgical treatment of mentally retarded children for esthetic reasons is discussed. In mentally retarded adults a facial deformity can give rise to functional problems; in some cases a facial deformity can stigmatize the mental state. In selected cases orthognathic surgery may offer a solution for either problem. Two cases are reported.

Adult↗