| 1. |
- Crona-Larsson, G, et al.
(författare)
-
Effect of luxation injuries on permanent teeth.
- 1991
-
Ingår i: Endodontics & dental traumatology. - 0109-2502. ; 7:5, s. 199-206
-
Tidskriftsartikel (refereegranskat)abstract
- Trauma to the supporting tissues of the teeth are among the most common dental injuries, leading to such complications as pulp canal obliteration, necrosis and root resorption. The aim of this investigation was to study the outcome for young permanent teeth subjected to luxation injuries. From 108 dental records 171 teeth with injuries to the supporting tissue were selected. The material comprised 130 subluxated, 15 extruded, 9 intruded, 15 exarticulated and 6 laterally luxated teeth in children aged 6-19 years. Apart from luxation, 59 teeth (35%) had additional crown and root fractures. 65% of the teeth recovered without complications. 78% of the subluxated teeth and 24% of the luxated teeth showed uneventful posttraumatic healing. Concomitant uncomplicated crown fractures or root fractures without displacement of the coronal fragment did not interfere with the healing. Of 60 teeth with healing complications, 52 (87%) were subsequently recorded as healed, the remaining 8 were extracted or had progressive root resorption. Loss of pulp vitality and external root resorptions were the most often recorded complications (28% and 17% of the total material respectively). Pulp canal obliteration was noted in 3% of the cases. Extent of injury and degree of tooth maturity were found to be related to healing complications.
|
|
| 2. |
- Hirsch, Jan M, et al.
(författare)
-
Tobacco habits among teenagers in the city of Göteborg, Sweden, and possible association with dental caries.
- 1991
-
Ingår i: Swedish dental journal. - 0347-9994. ; 15:3, s. 117-23
-
Tidskriftsartikel (refereegranskat)abstract
- Frome nine dental clinics within the Public Dental Service in the City of Göteborg, 2145 patients aged 14 to 19 answered a questionnaire concerning their tobacco habits. Tobacco was used in some form by 27 per cent of the patients and use increased with age. Smoking was more common among girls than among boys: 24 and 12 per cent, respectively. The statistical analyses showed that smoking as a habit and an increased number of cigarettes smoked per day are positively correlated with increases in the number of decayed, missing and filled teeth and the number of initially decayed proximal surfaces. Further, all caries epidemiological data were significantly higher among patients with tobacco habits compared to non-users. It can be concluded that there is a correlation between the tobacco habit and increased caries prevalence. However, dietary and oral habits have to be further elucidated before any definite conclusions can be made regarding the effect of the tobacco habit per se on the development of caries.
|
|
| 3. |
- Lundgren, Ted, 1959, et al.
(författare)
-
Retrospective study of children with hypophosphatasia with reference to dental changes.
- 1991
-
Ingår i: Scandinavian journal of dental research. - 0029-845X. ; 99:5, s. 357-64
-
Tidskriftsartikel (refereegranskat)abstract
- In the present retrospective study different dental and medical parameters have been analyzed in 17 Swedish children with established hypophosphatasia (HP). It was demonstrated that the basis for the establishment of the diagnosis varied among different dentists and physicians, and that the diagnostic parameters studied among the children varied. The most reliable parameters for HP included raised levels of phosphoethanolamine in urine, and clinical and radiologic findings associated with the legs. These findings were found among the children more often than lowered values of alkaline phosphatase in serum. Histologic analysis of an extracted tooth made a valuable diagnostic complement. It is concluded that a better diagnostic uniformity is recommended. In a well functioning collaboration with well defined tasks, both dentists and physicians can contribute to a reliable diagnosis.
|
|
| 4. |
- Lundin, S A, et al.
(författare)
-
Marginal leakage in occlusally loaded, etched, class-II composite resin restorations.
- 1991
-
Ingår i: Acta odontologica Scandinavica. - 0001-6357. ; 49:4, s. 247-54
-
Tidskriftsartikel (refereegranskat)abstract
- Microleakage was studied in class-II cavities restored with a calcium hydroxide liner and an adhesive system combined with two different posterior composite resins. The restorations were exposed to repeated loading when immersed in dye solution. The teeth were cut, and microleakage along the cavity walls and into dentin was evaluated by light microscopy. Dye penetration at the interface between the cavity and the restoration was recorded in 61% of the loaded and in 30% of the unloaded teeth. The difference between loaded and unloaded was greater for the teeth lined with Life than with Gluma dentin bonding.
|
|
| 5. |
- Ranggård, L, et al.
(författare)
-
Parathyroid hormone and enamel formation in rat maxillary incisors.
- 1991
-
Ingår i: Scandinavian journal of dental research. - 0029-845X. ; 99:2, s. 90-5
-
Tidskriftsartikel (refereegranskat)abstract
- Parathyroid hormone (PTH) plays an important role in regulating calcium in serum. It is also known to affect bone and dentin formation. The purpose of this investigation was to evaluate enamel formation in normal rats receiving added PTH. It is in two parts: a pilot study where a known method was tested, followed by the main study where the rats were given different doses of PTH. The enamel was examined in both studies and in the main study the ameloblasts were also investigated. Contradictory results were seen. In the pilot study, severe enamel aberrations occurred, while no divergence from normal amelogenesis was noted in the main study. A factor causing the disparate results was the use of a hard tissue marker (oxytetracycline) in the pilot study. It can be concluded that injections of PTH in doses that affect bone and dentin did not cause any changes in normal enamel formation.
|
|
