摘要:

The attitude to treatment of dental diseases under general anesthesia has been rather restricted in the dental profession in Scandinavia. Yet, some patients with certain medical conditions and patients haunted by anxiety may not be able to have conventional dental treatment. During the period 1975–1983, 1067 patients were treated in a group practice in Oslo. These patients are described with regard to gender, age, reasons for treatment, place of residence, source of referral, and type of treatment given. Some of the data are related to the year of treatment. The profile of patients changed during the observation period. At the beginning most of the patients came from Oslo and were less than 6 years old, whereas at the end most of the patients were more than 15 years old, lived outside Oslo, and had more conservative than radical treatment. It is concluded that there will probably always be a small group for whom dental treatment under general anesthesia will be necessary.

ISSN:0001-6357    

DOI:10.3109/00016358909004793

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

With foam components removed, mixed saliva from three donors were solidified in liquid nitrogen and sectioned, mounted, and fixed. Examination by transmission (TEM) and scanning (SEM) electron microscopy and energy-dispersive X-ray (EDAX) analysis were performed for paraformaldenyde-fixed sections, some of which were OsO4-postfixed. The TEM and certain SEM examinations showed the presence of fine and dense salivary network structures, seemingly originating from the major fibrous components. In OsO4-treated sections, TEM pictures showed reticulated arrangements with open cellular diameters down to 0.2μm. The EDAX analyses particularly showed the presence of Ca, Fe, K, P, and S, with increased Ca readings in major components. Untreated sections showed that strands, with diameters of more than 1–2μrn, had more electron-dense central portions than peripheries and sometimes had interior, very electron-dense, granules. The observed features indicate that saliva has internal structures consistent with its colloid chemical characteristics.

ISSN:0001-6357    

DOI:10.3109/00016358909004794

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

Samples of mixed saliva and of parotid and sublingual/submandibular saliva fractions from four donors were subjected to instantaneous solidification in liquid nitrogen followed by sectioning in a microtome/cryostat. The sections were stained with hematoxylin-eosin, periodic acid-Schiff, Alcian blue, Oil-red-O, or Sudan Black B and then examined at the light-microscopic level. In all the sectioned samples several previously never described features were observed, the most pronounced of which were a loose overall network structure and collections of lipoid droplets often in a loose arrangement. In the mixed saliva sample sections many of the microorganism-like structures were observed in large bunches associated with epithelial cells and densely staining saliva components. The present method was tested in a series of experiments for possible errors.

ISSN:0001-6357    

DOI:10.3109/00016358909004795

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

Topical application of aqueous solutions of TiF4to root surfaces has been shown to result in a rapid uptake of fluoride. The purpose of this study was to assess whether the application period and/or the ionic strength of the TiF4solution can be reduced without a corresponding reduction in the fluoride uptake. Root halves from human teeth were exposed to (a) 1% TiF4for 10 sec and 1, 2, and 4min, and (b) 3.4% TiF4for the same application periods. Root surface areas protected by nail polish served as controls. Transverse ground sections through the treated root surface areas were then prepared and analyzed for F by electron microprobe analysis. Most treated specimens showed F concentrations in the 0.60–1.94% range, whereas control surfaces contained less than 0.30%. Similar F concentrations were found in the surfaces treated with the two solutions. Reducing the application period resulted in a shallower penetration of F into the hard tissue but only a slight reduction of the F concentration in the surface layer. High concentrations of Ti were found on the surface of all treated specimens. This shows that both the application period and the ionic strength of TiF4solutions can be considerably reduced and still enable a high uptake of fluoride. The results indicate that TiF4may be an efficacious agent for F application to root surfaces under clinical conditions.

ISSN:0001-6357    

DOI:10.3109/00016358909004796

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

Radical polymerization of composite resins is inhibited by oxygen. For Microfill Pontic, a self-and photo-curing resin cement, irradiation is proposed as a means to reduce the thickness of the oxygen-inhibited surface layer. The thickness of the layer was measured by a dial gauge technique on irradiated and non-irradiated specimens, to determine a possible effect of irradiation. The results indicate that the depth of inhibition is reduced by irradiation and that an irradiation time of 20 sec is sufficient to give the maximum reduction.

ISSN:0001-6357    

DOI:10.3109/00016358909004797

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

Fifty-one individuals (28 girls and 23 boys) who had received orthodontic treatment were compared with 47 subjects (19 girls and 28 boys) without such treatment as to maximal mandibular mobility, chewing muscle tenderness, morphologic occlusion, occlusal/incisal state, and degree of tooth wear. All were 19 years old. There were no statistically significant differences between the groups except for the number of teeth present and maximal mouth opening, which were both smallest in those who had received treatment. The first finding is evident, extraction of premolars being an accepted mode of orthodontic treatment. The reduced mouth opening capacity was related to an increased number of individuals with four or more palpably tender muscle sites in that group of individuals.

ISSN:0001-6357    

DOI:10.3109/00016358909004798

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

The reestablishment and rate of osteodentin and dentin matrix formation in 27 apicoectomized replanted and 20 control incisors in cats were studied after Procion H8-BS vital staining. In control teeth the pattern of matrix formation differed in the various pulpal zones, with a higher rate of matrix formed toward apical areas, most dominantly in maxillary incisors. Osteodentin formation could be traced after a lag period of more than 10 days after replantation. Thirty and 60 days postoperatively osteodentin matrix was found in the total pulpal length in 83% and 73% of the teeth, respectively. A common finding was a tubular osteodentin matrix in the pulpal apical third in the replanted teeth. Tubular osteodentin matrix was, however, present most incisally in some teeth 60 days postoperatively. Internal resorption corresponding to outer cervical lesions dominated the pulpal reactions in the maxillary replanted teeth after 60 days. It is concluded that under the present experimental conditions the pulp tissue possesses a high healing potential and that the osteodentin formation reflects the pulpal healing pattern after replantation traumas. The results also indicate that successful pulpal healing depends on unexposed dentinal tubules.

ISSN:0001-6357    

DOI:10.3109/00016358909004799

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

In spite of many improvements in operative dentistry, the incidence of replacements of amalgam restorations remains high. It is possible that specific cavity features are important for the longevity of the restorations. Six hundred and ten epoxy plastic models, made from impressions of permanent teeth in which class II cavities had been prepared by eight Scandinavian dentists, were examined. The examination showed prevalent imperfect external and internal cavity features. These may reflect the operators' opinion of adequate operative dentistry, neglect to control design features, or lack of training in examining a cavity critically.

ISSN:0001-6357    

DOI:10.3109/00016358909004800

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor