Biomedical subjects

L Tronstad

Publications and source records attributed to L Tronstad.

At least 109 records · Page 6Linked to original sources

PubMed1976

Biologic tests of a proposed pulp capping agent (Reocap).

A calcium hydroxide-containing cement (Reocap) was tested with regard to its suitability as a pulp capping agent. The pulp of 34 monkey teeth was exposed and Reocap was applied to the pulp wound and the cavity floor, after which the cavities were filled with amalgam. The observation periods were 8 days (10 teeth) and 80 days (24 teeth). After 8 days a necrotic area was seen in the pulp subjacent to the pulp capping agent and the surrounding tissue was inflamed to varying degree. After 80 days hard tissue formation was observed at the exposure site in 21 teeth. The hard tissue enclosed areas of necrotic and/or vital tissue and a complete bridge had not formed. In 7 teeth the pulp was necrotic whereas 3 teeth presented a pulp free of inflammation. In the remaining teeth the pulp showed a chronic inflammatory reaction. As judged by these results, Reocap does not appear to be as well suited as a pulp capping agent as pure calcium hydroxide.

Animals↗

PubMed1975

The use of transparent teeth in the teaching of preclinical endodontics.

Demineralized teeth, which were cleared and hardened in xylene, were used in the teaching of preclinical endodontics. The teeth appeared well suited for the purpose. Of 39 students attending the course, 30 students thought that the use of transparent teeth had facilitated the learning of endodontic techniques.

Decalcification Technique↗

PubMed1975

Biological tests of a silicophosphate cement.

The biological compatibility of a silicophosphate cement (Fluoro-Thin) and a zinc phosphate cement (de Trey's Improved) has been assessed in in vitro (cell culture) and in vivo (monkey teeth) tests. In the in vitro tests both materials were toxic when freshly prepared. In experiments with prolonged cell-material contact time, with set specimens of the materials, the zinc phosphate cement appeared to be non-toxic, whereas the silicophosphate cement was clearly toxic. The in vivo experiments confirmed that a possible pulp reaction cauded by zinc phosphate cement is of a mild nature. The silicophosphate cement, however, cauded a moderate or severe reaction in the pulp after 8 days of observation, and there was chronic inflammation in most teeth after 36 or 72 days. It was concluded, therefore, that Fluoro-Thin should not be used as a luting agent or for restorative purposes in direct contact with vital dentine.

Animals↗

PubMed1975

The use of dental services among Norwegian adults in 1973.

The dental treatment pattern and its determinants were surveyed in 1973 by interviews with a sample comprising 1,632 persons drawn to cover the total Norwegian population aged 15 and above. In all, 58% of the interviewees stated having visited a dentist during the year prior to the interview. In contrast, 16% had not consulted a dentist for at least 5 years. Fifty-five percent of the sample reported having received fillings at the last dental visit and 15% reported having received some periodontal and/or preventive treatment. Regular (at least annual) treatment attendance was claimed by 52% of the sample. However, some respondents had seemingly embellished their treatment behavior, and a relatively valid estimate for the current proportion of regular treatment attenders was considered to be 40% of the adult population in Norway. Sex and geographic region were found to be the most influential predictors of the recent treatment pattern, whereas school dental treatment had a major influence in youth. Dental conditions including the wearing of dentures was the reason most often given for not seeing a dentist on a regular basis.

Adolescent↗

PubMed1975