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Biomedical subjects

W A van der Kwast

Publications and source records attributed to W A van der Kwast.

At least 19 recordsLinked to original sources
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

Autogenous maxillary bone grafts in conjunction with placement of I.T.I. endosseous implants. A preliminary report.

Small bone defects due to atrophic, traumatic or periodontal bone loss can be grafted with autologous bone grafts taken from the maxillary tuberosity. This study presents a 1-3 years follow-up of 22 patients who were treated according to this technique. Thirty-two implants were placed 6 months after bone grafting. All implants were functioning well at the time of investigation.

Adult↗
PubMed1991

Palatal mucosa grafts for oral implant devices.

Oral implants placed in the atrophic mandible often lack sufficient surrounding attached keratinized gingiva. Although mobile mucosa surrounding the implant does not necessarily need to be replaced, many oral surgeons and dentists prefer attached, keratinized gingiva, especially in cases where oral hygiene is imperfect. This article discusses a method of palatal mucosa transplantation to improve the implant recipient site. The clinical results of this method used in 30 patients are reported.

Adult↗
PubMed1991

Intra- and early postoperative complications of the Le Fort I osteotomy. A retrospective study on 410 cases.

The results of a retrospective study of the complications that occurred in 410 Le Fort I osteotomies performed in the Department of Oral and Maxillofacial Surgery of the Free University Hospital, Amsterdam, the Netherlands, are presented. The complication rate was 9.0%. In the discussion, our results are compared with the literature.--Suggestions are made on how to avoid these complications.

Fistula↗
PubMed1991

[Ameloblastoma: a review].

A review of the ameloblastoma of the jaws is presented. The epidemiology and classification are dealt with, followed by a description of the clinical, radiographic, histopathologic and therapeutic aspects. The paper is partly based partly on personal experience and partly on data from the literature.

Aged↗
PubMed1990

Condylar atrophy and osteoarthrosis after bimaxillary surgery.

Radiographic evidence of condylar atrophy was seen in 12 patients out of 206 patients who underwent surgical orthodontic treatment. All 12 patients had the same dentofacial deformity, high-angle mandibular retrognathia (Class II open bite), and all but one had bimaxillary surgery. The etiologic factors are discussed. The dentofacial deformity is considered to be the main reason for condylar resorption, but orthognathic surgery is supposed to stimulate the progress of the disease by increased loading, disk displacement, and immobilization.

Atrophy↗
PubMed1990

[Simultaneous removal of lower wisdom teeth with local anaesthesia: a pilot study].

To determine whether it is justified to remove both mandibular third molars in one session, 69 patients were treated single-sided and 53 patients double-sided using local anaesthesia (Ultracain D-S forte). All patients were healthy. The mean age was 24.0 years. No significant differences in complaints were found. Therefore, it seems justified to remove mandibular third molars double-sided in one session in healthy young patients.

Adult↗
PubMed1990

The influence of the Le Fort I osteotomy on nasal airway resistance.

Pre- and postoperative rhinomanometric measurements were done on 13 patients by whom a Le Fort I osteotomy was performed. The claim that Le Fort I osteotomies may produce deleterious respiratory effects in the form of an increase in nasal airway resistance was investigated. The results are discussed.

Adult↗
PubMed1989

[Tumors of the accessory salivary glands of the mouth; a follow-up study of 101 patients].

In the period 1970-1987 101 patients were seen with a neoplasm of the intraoral accessory salivary glands. There was no sex preference; mean age of the patients was 51 years. The junction of the hard and soft palates is a site of predilection. Over 50 per cent of these tumours are malignant, the adenoid cystic carcinoma being the most notorious. Treatment consists primarily in surgical removal. In case of malignancy postoperative radiotherapy is often instituted, resulting in local cure in almost all cases. However, the prognosis of the malignant salivary gland tumours, especially of the adenoid cystic carcinoma, is rather unfavourable due to distant metastases.

Adolescent↗
PubMed1989

Magnetic resonance imaging of partial temporomandibular joint disc displacement.

Unilateral magnetic resonance imaging (MRI) of the symptomatic temporomandibular joint (TMJ) was performed on 55 patients. The position of the articular disc in relation to the condyle was established on sagittal images. Particular attention was paid to partial or complete anterior positioning of the disc. MRI was correlated with clinical and, in 33 cases, surgical findings. The concept of partial anterior displacement may be useful in relation to treatment planning.

Adolescent↗
PubMed1989

Eminectomy and discoplasty for correction of the displaced temporomandibular joint disc.

Eminectomy with or without a subsequent discoplasty was performed on 30 patients (36 joints) with internal derangement of the temporomandibular joint (TMJ) confirmed either arthrographically or with magnetic resonance imaging. The importance of the inclination of the TMJ eminence and the therapeutic value of eminectomy are discussed. The TMJs were clinically evaluated before and at least 1 year after surgery in respect to opening function and symptoms. The results were promising (86.8% of the patients felt better). In five patients with a preoperative diagnosis of anterior disc displacement with reduction, only an eminectomy was performed. In these five cases eminectomy alone was sufficient to restore normal TMJ function.

Adolescent↗
PubMed1989

Temporomandibular joint symptoms in orthognathic surgery.

Pre and postoperative TMJ-symptoms were observed in the various dentofacial deformities of 480 patients operated on because of a dysgnathia. Preoperative TMJ-symptoms were seen in 16.2% of the 480 patients. After surgery 66% of the preoperatively symptomatic patients reported fewer or no TMJ-symptoms. On the other hand 11.5% of preoperatively asymptomatic patients developed TMJ-symptoms after surgery. Although not statistically proven, a tendency was seen to more TMJ-symptoms in low and normal angle patients in comparison with high angle patients. The chance is high, however, that TMJ-symptoms in low and normal angle mandibular retrognathism patients will improve after surgery. The chance of developing TMJ-symptoms in high angle, absolute mandibular retrognathism patients, operated on by means of bimaxillary surgery, is considerable.

Cohort Studies↗
PubMed1989

Oral leukoplakia, with emphasis on malignant transformation. A follow-up study of 46 patients.

A review of oral leukoplakia, based on data from the literature and experience with 84 patients is presented. The leukoplakic lesions of 3 patients developed malignant transformation within an average period of 5 years. All three patients were elderly women with idiopathic leukoplakia, in two cases of the homogeneous and in one case of the non-homogeneous type. The initial biopsy of the former two patients showed only hyperorthokeratosis without epithelial dysplasia. In the first biopsy of the third patient epithelial dysplasia was recorded. One of the patients finally died of widespread metastases. The other two have been treated surgically and are still alive.

Adolescent↗