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Biomedical subjects

M Breivik

Publications and source records attributed to M Breivik.

6 recordsLinked to original sources
PubMed1990

Secondary dentin in replanted teeth--a histometric study.

To quantify the secondary dentin formation in replanted teeth, 16 human premolars with a postoperative observation period of 6, 12 and 24 weeks were studied histometrically. In spite of marked intra- and interindividual variations, a regression analysis revealed a significant correlation (r = 0.70) between observation time and the quantity of secondary dentin in the coronal pulp registered by histometry. A comparison with a previous semiquantitative interpretation of the same material showed that the histometric method was more accurate.

Dentin, Secondary↗
PubMed1987

Histometric study of root resorption on human premolars following experimental replantation.

A histometric method was applied for evaluation of root resorption in 57 experimentally replanted teeth and 22 controls. Representative axiobuccolingual sections were selected for measurement of resorptions at a magnification of x 40. The frequency of root resorption in the control teeth was low. In replanted teeth marked resorptive activity elicited by the trauma appeared after 2 wk. The extent of active resorptions increased until the third postoperative week. On an average 14% of the root periphery was affected at this stage. After the sixth postoperative week progressive cement deposition took place in the resorption lacunae. Incidental ankylosis of the periodontal membrane also occurred from this observation time but there was no increase among the long-term groups.

Adolescent↗
PubMed1977

Evaluation of histologic criteria applied for description of pulp reactions in replanted human premolars.

To test the reproducibility of a scoring system prepared for the study of the tissue changes in replanted teeth, 30 teeth were allocated at random from a material comprising 70 replanted and control teeth. The scoring system elaborated was applied for description of the odontoblast layer, predentin, secondary dentin, circulatory alterations, resorption, Weil's zone, cellular infiltration and calcification. The registrations were performed twice with a time interval of approximately 2 months. The scores were subsequently compared. Generally speaking, the double determinations were in good agreement as only 4.7% of the pairs of registrations failed to correspond. The agreement was particularly good for secondary dentin, cellular infiltration, resorption, Weil's zone and calcification scores. These criteria are accessible for group comparisons when differences in pulp tissue characteristics are small. The remaining three criteria may prove not to be useful unless the tissue response is substantial.

Bicuspid↗
PubMed1977

[Reimplantation and autotransplantation of teeth. Review of the literature].

The most important factor for a favorable long-time prognosis of replanted and autotransplanted teeth is a short extra-alveolar periode. Implanted teeth should be followed radiographically with special attention to external resorptions as these correspond well with the histological picture. Avulsed teeth replanted within 30 minutes have a fairly good long-time prognosis. A little less than half of the teeth are still in place after five years. In international replantation the procedure can be performed with a short extraalveolar periode. By using the methods giving the shortest extraalveolar periods during autotransplantation a favorable long-time prognosis is to be expected in most of the cases. Implantation can be performed with all teeth at any developmental stage. However, a favorable long-time prognosis can only be expected where the teeth are removed from their alveoli without severe damage to the periodontal membrane. Compared to the altenative treatments which often are removable or fixed appliances or artificial implants, the prognosis for implanted teeth is sufficient good to accept the treatment as lege artis.

Animals↗
PubMed1976

[Occurence of dens invaginatus among a group Norwegian children].

The aim of the present investigation was: 1) to determine radiographically the prevalence of maxillary incisors with invaginations, and of individuals with such teeth in a Norweigian population. 2) to classify the invaginations according to Hallett (1953), 3) to test the findings for sex differences, 4) to determine the concordance between a radiographical and a clinical method for identifying invaginations. Based upon a material of 415 school-children it was found radiographically that approximately 1/8 of the maxillary central incisors and nearly one half of the lateral incisors had invaginations. More than half of the children had one or more invaginated teeth (Table 2). The majority of the invaginations were of class I/III. Only a few were classified as class III (Table 2). The findings are comparable to those of Hallett (1953). Boys had a higher incidence than girls of class III invaginations in lateral incisors. The difference was statistically significant (5%). The girls had more class I/II invaginations in the central incisors than the boys, but the difference was not statistically significant. In the clinical examination three of four lateral incisors, one of four central incisors and four of five individuals were found to have invaginations. All invaginations found in the radiographic investigation were also registered in the clinical examination.

Adolescent↗