Tandlaegebladet最新文献

A patient with a cavernous hemangioma of the maxilla is presented. The tumor had caused resorption of the roots af adjacent teeth. After enucleation, the area healed without complications, and the pulpal tissues of the teeth remained vital.

Insertion of osseointegrated implants in the anterior mandibular region for retaining a removable denture represents a treatment, which is cheap for the patient and surgically uncomplicated. Bone height measures from two radiographic examinations 1) panoramic radiographs and 2) lateral tangential views, were compared. Radiographs from 20 patients were analyzed. The vertical height of the mandible was measured in the midline as well as in the cuspid region on the panoramic radiographs and the tangential views ("maximum" bone heights). The mean maximum bone heights were higher on tangential views in both regions. On the tangential views the inclinations of the future implants were estimated and the part of the alveolar ridge having a width less than 5 mm, which is the minimum width for housing an implant, was compiled. The resulting height ("effective bone height") was calculated. In 10% of the cases the effective bone height was equal to the maximum height, and in 90% it was smaller. The over-estimation varied between 0 mm and 15.3 mm. It is concluded that panoramic radiographs are unreliable for evaluating bone height in planning insertion of oral implants in the anterior mandibular region. They give no information about form and width of the bone. Tangential views reveal the true morphology of the mandible as seen in a cross-section, and offer an opportunity for calculating the effective bone height at disposal for oral implants.

A case of lymphangioma in the tongue is discussed with special reference to diagnosis, treatment and prognosis. The patient is a boy, aged 13, with a congenital malformation in the right half of the tongue. The lesion was removed by surgery. Histologic examination showed lymphangioma. In cases of minor, localized lymphangiomas the clinical diagnosis may be difficult. A past history information of recurring swellings can be regarded as almost diagnostic. The treatment of choice is surgery, if necessary in several settings. Recurrences are often seen.

Light polymerized composite resin materials are now widely used in dentistry. Most resins are polymerized by light sources which have a powerful emission of visible light and a small emission in the ultraviolet light A spectrum (UV-A 320-400 mm). Possible eye damage, induced by such light, has been investigated, but the effects on the oral mucosa, which is directly exposed to the light, have been examined in only one animal study. Langerhans cells (LC) are dendritic non-epithelial cells which form a network within stratified epithelia. LC have features of macrophages, functions as antigen-presenting cells, and play an important role in the immune system associated with skin and oral mucosa. Pilot studies on human skin transplanted to nude mice showed that radiation with small therapeutic doses from a dental light curing unit (DLU) having only a small fraction of UV-light can reduce or deplete the OKT6 surface marker of LC in human epithelium. Further investigation of the photobiologic mechanisms involved spectral analyses of the emmission from the lamps and construction of a suitable light source for establishing an action spectrum for LC in the UV-A range. The action spectrum for LC in the UV-A range was obtained by exposing human skin, grafted to nude mice, to monochromatic light with a band pass of 5-10 nm. Criterion for threshold doses was total depletion of LC, visualized by staining with known LC-markers, monoclonal antibodies OKT6, DAKO-Vimentin, DAKO-HLA-DR and DAKO-S-100. The action spectrum for LC consisted of a biphasic curve, with a non-linear, strong wave-length dependency.(ABSTRACT TRUNCATED AT 250 WORDS)

The effect of autologue bone transplantation to 26 vertical, marginal bone defects has been investigated on a long-term scale ranging from 2 to 26 years. The operation technique included excision of gingival pocket epithelium, removal of granulation tissue, and cleansing of the root surface with scalers. The bone cavities were filled preferably with cancellous bone chips, usually from the patients' upper third molar region. After suturing, the area was covered with a wound paste for 12-14 days. Loosened teeth were splinted for at least 2 months. In 25 of 26 teeth (96%) a bone regeneration was observed radiographically. The maximum healing of 22 cases occurred 2-12 months (median 6 months) postoperatively (Table 1). The maximum healing was maintained for more than half of the teeth (56%) at the last control, median 16 years (range 2-26 years), and none of these teeth were extracted of periodontal causes. They might therefore be expected to function for still a long time. Eight teeth (32%) showed more or less recurrence when controlled 5 to 15 years (median 10 years) after operation and 6 of the 8 teeth with recurrence were extracted. Three teeth (12%) developed root resorption and were extracted 6, 10 and 14 years postoperatively. As most of the complications occurred after extended observation periods, this factor has to be taken into account when prognosis of periodontal treatment procedure is considered.