PubMed Health⌕ Search

Biomedical subjects

G Keszthelyi

Publications and source records attributed to G Keszthelyi.

At least 19 recordsLinked to original sources
PubMed1992

[Chemical plaque control].

Most of the diseases with which dentists must deal with are related to microbial plaque and bacterial infection. The mechanical removal of supra- and subgingival plaque by the patient and by the dentist respectively, is time consuming and exacting, furthermore it is not one hundred per cent successful. There has been extensive search for many years for chemical agents that could supplement or even substitute mechanical plaque removal. Many chemical agents delivered in different ways were tested. Chemotherapeutics of various modes of action have to meet pharmacokinetic and biological requirements. Apparently the ideal anti-plaque agent is not yet available, so that they should be reserved for well defined clinical situations and short--or medium--term application.

Anti-Bacterial Agents↗
PubMed1992

[Comparative study of the rheological properties of artificial saliva types based on hydroxy-propyl-methyl-cellulose (methocel) and carboxy-methyl-cellulose (CMC)].

Apparent viscosity at different shear rates was measured for two types of saliva substitutes based on methocel and CMC, and was compared with that of human whole saliva. Results indicate, that fresh mixed human saliva is viscoelastic, exhibiting pseudoplasticity. Methocel containing artificial saliva and human whole saliva are similar in their rheological properties, while the preparation based on CMC is almost a Newtonian liquid. From the results it can be concluded that the saliva substitute containing 0.5% of methocel appears to be a better substitute for natural saliva than of containing CMC as far as rheological properties are concerned.

Carboxymethylcellulose Sodium↗
PubMed1991

The width of plaque-free zones on primary molars with attachment loss.

The width of plaque-free zones on stained surfaces of extracted primary molars showing attachment loss was measured. The teeth were divided into 4 groups: maxillary first and second molars, mandibular first and second molars. 30 measurements were made under a stereomicroscope on each of the 4 surfaces in every group. The plaque-free zone had a mean width of 1.75 +/- 0.49 mm and a range of 1.0-4.3 mm. The plaque-free zone was significantly (P less than 0.001) wider on the proximal surfaces (1.94 +/- 0.56 mm) than on the combined buccal and lingual surfaces (1.56 +/- 0.32 mm). There was no difference between the 2 proximal surfaces while the lingual surfaces gave higher values than the buccal ones. On the second and on the lower primary molars, the plaque-free zones were wider than on the first and on the upper molars.

Dental Plaque↗
PubMed1991

[Probing and occlusal caries].

Occlusal fissures are one of the most frequent locations for dental caries. In order to detect early caries lesions in terms of "sticky fissures" tactile examinations with a sharp explorer are important parts of a classical clinical examination. The aim of the present investigation was to study whether probing with an explorer contributed to the development of occlusal caries in permanent of first molars. The study was carried out in 101 children (56 girls and 45 boys) who had intact pairs of first molars. Altogether 104 first molar pairs were studied. One and two years later both of the pairs were probed, but there was no significant correlation found between previous probing and occlusal caries.

Child↗
PubMed1989

[Contributions to the history of Hungarian periodontology].

The author reviews the highlights of the work and thoughts of those Hungarian dentists, such as Arkövy, J., Robicsek, S., Károlyi, M., Orbán, B. and Morelli, G. who contributed the most to the development of the practice and science of periodontology.

History, 20th Century↗
PubMed1989

[Periodontal effects of the bridge and neighboring anchors, based on follow up studies].

Two weeks after cementing in the dentures there is no evaluable difference in the Tm., the Pl. I. and the G. I. between the check-up examined surfaces on the approximal surfaces close to the bridge. Generally 8 months later a higher G. I. points on the approximal surfaces of neighbouring anchors by the employed periodontological examining methods. It means an unfavourable prognostic that the inflammation symptoms on the surfaces the second and third rate abutment teeth remained also after the prosthetic treatment to a similar degree.

Dental Abutments↗
PubMed1989

[The size of the overlapping of the gingival margin in Class II amalgam fillings examined in the teeth and their radiographic images].

200 Class II extracted teeth provided with amalgam filling were examined. The size of the overlapping of the fillings were measured on the X-ray pictures and in the transverse section of the teeth embedded in self-cementing plastic under a stereomicroscopy by means of an ocular micrometer. The mean overlapping of the fillings was 0.52 +/- 0.44 millimeters on the teeth and 0.48 +/- 0.43 millimeters on the X-ray pictures. There was no significant difference between the values obtained by both methods. On the upper teeth [teeth: 0.64 +/- 0.50 millimeter, X-ray: 0.59 +/- 0.48 millimeters (significantly) P less than 0.001] the overlapping of the fillings was greater than on the lower ones (teeth: 0.39 +/- 0.49 millimeters, X-ray: 0.36 +/- 0.33 millimeters). The other comparisons did not show any significant difference by either method. The oro-vestibular extension of the overlapping gingival filling borders was, on the average 3.45 +/- 1.25 millimeters and amounted to 46.25 +/- 15.94% of the width of the surfaces. The percentual oro-vestibular extension of the gingival filling borders was significantly greater (p less than 0.05) on the premolars than on the molars. The gingivally overlapping filling showed also an oral and/or vestibular overlapping.

Bicuspid↗
PubMed1989

[The attrition of deciduous teeth].

The aim of the present investigation was to study tooth wear in extracted primary teeth. Altogether 992 deciduous teeth were examined under a stereomicroscope with a magnification of 25X. The amount of attrition (former name abrasion) was scored according to the Tooth Wear Index published by Smith and Knight (1984). On the basis of the present study the following conclusions can be drown: 1. Attrition was found in more than three-quarter of the examined teeth which shows that children with all certainty chew more than it is assumed. 2. Attrition could be assigned mainly in the class 1. and dentin was exposed in 12% of the cases. 3. Attrition of molar teeth is higher than that of the anterior teeth. 4. Attrition of the first molars is higher than that of the second molars.

Child↗
PubMed1989

[DMF study on extracted deciduous teeth].

The aim of the present investigation was to study the number of the carious surfaces of extracted primary teeth in order to determine component m in the dmf-s index. Altogether 903 deciduous teeth were examined under artificial light with a dental probe. The surfaces were evaluated separately. The examined teeth were divided into two groups according to the amount of root resorption. On the basis of the present study the following conclusion can be drawn: 1. The average of df surfaces of molars was 2.34, whereas it was 0.74 at the front teeth. The df number shows practically only caries, because filled surfaces were found in only 1.99% of the cases. 2. In any type of the teeth df lesions were the rarest on the vestibular and oral surfaces. 3. Caries (filling) was found most frequently on the occlusal surfaces of the upper and lower 1st molars. Caries (filling was the rarest on the vestibular surfaces of the upper 1st and 2nd molars. 4. The amount of root resorption did not show much influence on the df score. 5. During the calculation of the dmf-s average of the primary teeth the m value can be substituted for 2.0.

Child↗
PubMed1987

Attachment loss in primary molars.

The view that primary teeth are only rarely affected by periodontitis has been generally adopted. The aim of the present work was to measure attachment loss and to establish its prevalence, severity and distribution in stained, extracted primary molars. The material consisted of 4 groups of 50 teeth each: first and second upper and first and second lower primary molars. Teeth were selected to fulfil 2 criteria: (1) a carious cavity not extending beyond the cemento-enamel junction and involving only 1 of the proximal surfaces, the other 3 surfaces being sound; (2) root resorption, if present, not affecting more than the apical third of the roots. The teeth were stained in 1% aqueous crystal violet and examined under a stereomicroscope fitted with an ocular micrometer. The distance between the cemento-enamel junction and the most coronal attachment fibres was measured in the mid-line of each surface. Attachment loss was found in 94% of the teeth and on 2/3 of the surfaces. This indicates that periodontitis in primary teeth is not a rare phenomenon. The mean loss of attachment was 0.26 +/- 0.32 mm, which cannot be regarded as clinically important. The maxillary molars and the first molars, and, the proximal surfaces showed more loss of attachment than did the mandibular molars and the second molars, and the buccal and lingual surfaces taken together. This pattern of attachment loss is similar to that seen in permanent molars. On the carious proximal surfaces, significantly more attachment loss was noted than on the sound proximal surfaces.

Connective Tissue↗
PubMed1985

Loss of attachment adjacent to class II carious lesions.

The present study was designed to investigate the relationship between large open class II carious lesions and loss of periodontal attachment in 224 extracted teeth. Each tooth had a carious and a sound approximal surface. The teeth were divided into 4 groups: upper premolars, upper molars, lower premolars and lower molars each consisting of 56 teeth. Within each group, the carious lesions were divided equally between the mesial and distal surfaces. The teeth were stained and loss of attachment was measured under a stereomicroscope fitted with an ocularmicrometer. The difference in loss of attachment between carious (0.79 +/- 0.05 mm) and sound (0.76 +/- 0.04 mm) surfaces was not statistically significant. Loss of attachment was greater on the carious surface of 98 teeth, equal to in 40 teeth and less in 86 teeth than the sound surface. Mesial and distal surfaces with and without carious lesions exhibited essentially the same degree of loss of periodontal support. Upper molars and lower premolars tended towards more loss of attachment when compared with upper premolars and lower molars. The results indicate that large open class II carious lesions cannot be regarded as an important factor in the progression of attachment loss.

Bicuspid↗