International journal of oral surgery最新文献

Leiomyosarcomas are extremely rare in the oral region. A case of a malignant tumour of the smooth muscle of the mandible possibly originating from a pre-existent benign counterpart is reported and the literature briefly reviewed. The case presented suggested the possibility that leiomyosarcomas, whenever they originate as a result of malignant transformation in a leiomyoma, may grow to an enormous size and grow slowly.

56 patients were monitored for a period of 26 weeks following injury to one of the peripheral branches of the trigeminal nerve. A further 10 patients were followed up after periods of 1 to 9 years suffering impaired facial sensation. Tests showed that 50% of the patients returned to normal in 3 months and 60% in 6 months. The fine sensations of touch and temperature recovered first and the response to pricking and two-point discrimination occurred later. Not all patients recovered normal sensation. A small proportion continued to suffer disturbing sensations such as tingling, burning and formication.

The volume of the secretion of saliva is decreased in elderly people. The volume of salivary secretion varies directly with acid DNase activity. Neutral DNase activity, however, shows no significant variation.

22 edentulous women, 11 with and 11 without signs of metabolic bone loss were treated by a combined sandwich-visor osteotomy. Longitudinal studies showed a higher rate of resorption in women with radiographic signs of metabolic bone loss. The analysis was based upon lateral cephalometry.

A histoenzymological study was carried out on 41 tissue specimens removed at biopsy and for surgical operations of the following lesions: benign hyperkeratosis, lichen planus, severe epithelial dysplasia, carcinoma in situ, epidermoid carcinoma, radicular cyst, odontogenic keratocyst and ameloblastoma. The purpose of this study was to study some possibly significant variations in levels of activities of oxidative enzymes, diaphorases, acid phosphatases and Naphthol esterases in such lesions (normal oral mucosa and epidermis serving as controls). In the lesions of the oral mucosa, these histoenzymological variations were not sufficiently characteristic to contribute to histological diagnosis, (i) In lichen planus, some vacuolated or necrotic basal cells lacked enzyme activities, whereas in the upper layers, enzyme activities were irregularly present, (ii) Benign hyperkeratosis showed enzymatic activities similar to those of the normal epidermis, namely high oxidative activities particularly prominent in basal cells and in granular layer, and esterase activity beneath the keratinized layer, (iii) In severe epithelial dysplasia, carcinoma in situ and epidermoid carcinoma, numerous variations of activities of oxidative enzymes, esterases and acid phosphatase were seen from one cell to the other. In cystic diseases of jaws, enzymatic activities were equally nonspecific in the epithelial lining of the radicular cyst and the odontogenic keratocyst (activities similar to those of normal oral epithelium and epidermis, respectively). But in common ameloblastoma, there was diffuse uniformly low oxidative enzymatic activities in the epithelium and high widespread activity of alkaline phosphatase in the stroma. The latter may be useful in differentiating the cystic acanthomatous variety of ameloblastoma from odontogenic keratocysts of the jaws.

In a series of monkeys, titanium implants (Xenodent®) were installed in the sockets of mandibular incisors. The animals were sacrificed 7 and 12 weeks after the implantations. The healing was studied by histological and microradiographical techniques. A gradual osseointegra-tion free from adverse interference could be noticed.

Familial odontogenic keratocysts are described in this report. The Case 1 patient, who has 3 sisters, developed odontogenic keratocysts. The 2 younger sisters (Cases 2 and 3) also had odontogenic keratocysts, although the elder sister did not have any odontogenic cysts. The father of the patients had a history of removal of a jaw cyst, and the mother was found later to have malignant ameloblastoma. Besides the odontogenic keratocysts, the Case 1 patient had basal cell nevus, prominent frontal process, and ocular hypertelorism; the Case 2 patient had prominent frontal process; the Case 3 patient had prominent frontal process, ocular hypertelorism, and squint. All 3 sisters are suspected of being patients with the basal cell nevus syndrome. The Japanese dental literature concerning the basal cell nevus syndrome is reviewed.

A case of a cystic central mucoepidermoid tumor of the mandible is presented. The radiographic and histopathologic manifestations of the lesion bear some resemblance to the odontogenic cyst. Conservative treatment by simple enucliation resulted in 3 recurrences in a 7-year period. En block resection of such lesions is recommended.

As a late complication after radical neck dissection, this paper reports a bony mass at the sternal end of the clavicle associated with hypertrophy of the sternohyoid muscle. The bony mass and hypertrophy of the muscle were considered due to continuous mechanical strain by the drooping of the shoulder caused by injury of the accessary and cervical nerves, left-handed physical labour, and the lack of the sternocleidmastoid muscle in rotating the head.