| 1. |
- Bjarnason, Sibilia, et al.
(författare)
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Enamel fluoride and caries in Icelandic children and a comparison of enamel fluoride in Swedish and Icelandic children.
- 1989
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Ingår i: Caries research. - 0008-6568. ; 23:2, s. 87-91
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Tidskriftsartikel (refereegranskat)abstract
- The fluoride content in surface enamel and its relationship to caries experience was studied in a group of Icelandic schoolchildren living in a low-fluoride area. Fluoride content was assessed by means of in vivo enamel biopsies sampled from 248 subjects aged 11 and 12 years. Dental examinations were performed in conjunction with the biopsy sampling and by the same examiner 1 year later. The prevalence and incidence of initial (DSI) and manifest (DFS) caries lesions were recorded separately. A median fluoride concentration of 610 ppm at a median biopsy depth of 4.2 microns was observed. A significant positive correlation was found between DSI and enamel fluoride content in girls and all older children. Additionally, surface enamel fluoride was measured in 72 Swedish children from a low-fluoride area but exposed to regular topical fluoride treatments. The difference in mean fluoride concentrations between the Icelandic and Swedish study populations was highly significant. From the measured fluoride concentrations the enamel fluoride profiles for both study populations were constructed. The differences in fluoride content were most pronounced in the outermost layer, apparently reflecting the higher exposure to and acquisition of topical fluoride in the Swedish children.
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| 2. |
- Bjarnason, Sibilia, et al.
(författare)
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Sugar consumption and caries experience in 12- and 13-year-old Icelandic children.
- 1989
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Ingår i: Acta odontologica Scandinavica. - 0001-6357. ; 47:5, s. 315-21
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Tidskriftsartikel (refereegranskat)abstract
- Dietary habits with regard to sugar consumption and caries experience were studied in a group of 275 Icelandic children aged 12 and 13 years. The pattern of meals and sugar-containing food intake frequency were assessed by means of a dietary questionnaire. All dental examinations were performed by one examiner, using standardized methods and diagnostic criteria. Only 75% of the children had three regular meals daily. Breakfast and lunch were the most frequently omitted meals. Sweet buns were consumed by 32% of the children with meals and by 58% between meals, whereas soft drinks were consumed by 42% and 46%, respectively. Eighty-three per cent of the children reported eating sweets daily. The most popular products included confectionery, buns, cakes, and soft drinks, which constituted 53% of the intake with meals and 68% of that between meals. A higher caries incidence was associated with frequent intake of buns and cakes with meals and confectionery.
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| 3. |
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| 4. |
- Chabala, J M, et al.
(författare)
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Elemental imaging of dental hard tissues by secondary ion mass spectrometry.
- 1988
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Ingår i: Swedish dental journal. - 0347-9994. ; 12:5, s. 201-12
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Tidskriftsartikel (refereegranskat)abstract
- High resolution imaging by secondary ion mass spectrometry (SIMS) has been employed in a chemical-microstructural pilot study of different classes of hard tissues from human and rat. The special scanning ion microprobe instrumentation permitted the recording of element-resolved images with a lateral resolution of about 50 nm. Sharp distribution micrographs were obtained for Ca+, F- and CN-, and in selected specimens for Na+, K+, Mg+, O-, Cl-, C- and PO-. Several trends in the elemental kinetics of mineralization were comprehensively illustrated and new aspects were indicated. The paper points out the broad scope of interest, and the potentialities of unique applications, in SIMS imaging of biomineralized tissues, the conditions for efficient employment of the recently developed technique are briefly discussed and demonstrated.
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| 5. |
- Crona-Larsson, G, et al.
(författare)
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Luxation injuries to permanent teeth -- a retrospective study of etiological factors.
- 1989
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Ingår i: Endodontics & dental traumatology. - 0109-2502. ; 5:4, s. 176-9
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Tidskriftsartikel (refereegranskat)abstract
- Trauma to permanent teeth with luxation injuries often leads to clinical treatment problems. Traumatic injury patients in local clinics are often limited in number. The aim of this investigation was to retrospectively study the etiological factors in luxation injuries to permanent teeth in relation to sex, age, time of year and diagnosis. A total of 108 files from patients, aged 6 to 19 years, with 196 teeth with luxation injuries, were collected. The maxillary central incisors represented 70% of all teeth injured and 70% of the teeth belonged to children between 8 and 12 years of age. Falls (34%) and bicycle-riding (30%) were the most frequent reasons for trauma, followed by sports (14%) and assaults (13%). Boys were more often involved in trauma. Girls were as often involved in sports accidents as boys. Subluxation was the most frequent diagnosis (77%), followed by extrusion, intrusion, exarticulation and lateral luxation. Accidents were reported most frequently during spring and early summer. A slight increase was also noted during autumn.
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| 6. |
- Engstrom, C, et al.
(författare)
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Effects of orthodontic force on enamel formation in normal and hypocalcemic rats.
- 1986
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Ingår i: Journal of oral pathology. - 0300-9777. ; 15:2, s. 78-82
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Tidskriftsartikel (refereegranskat)abstract
- Maxillary incisors of young rats fed a diet deficient in calcium and vitamin D for 4 weeks developed hypoplastic enamel surfaces. In the enamel of maxillary incisors of deficiently fed rats as well as in normal rats, an orthodontic force (50 gm) acting on their incisors for 3-7 days induced foldings in the enamel, globular projections from the surface and marked hypoplastic defects. However, the orthodontic force produced clusters of free-lying enamel matrix only in the nutritionally deficient rats. In view of these observations, it might be concluded that disturbances in enamel formation which cause hypoplasias can be caused both by mechanical trauma and hypocalcemia. Furthermore, it seems that hypocalcemia increases the susceptibility to mechanical trauma of ameloblasts in their secretory stage. Whether the changes in enamel formation noted in the hypocalcemic rats is a direct effect of lowered serum calcium or due to the increase in parathyroid hormone is not known at present.
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| 7. |
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| 8. |
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| 9. |
- Malmberg, E, et al.
(författare)
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Fluorine uptake in bovine enamel from various treatment agents.
- 1987
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Ingår i: Swedish dental journal. - 0347-9994. ; 11:6, s. 263-71
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Tidskriftsartikel (refereegranskat)abstract
- Bovine tooth enamel with a low and uniform fluorine content was used for the study of fluorine uptake by the Micro-Acid-Drop enamel biopsy technique from different treatment agents commonly used in Sweden. The fluorine concentration in the enamel was also measured after an exposure of the treated test surfaces in artificial saliva for 90 minutes. Sodium fluoride 0.2% and 2%, ferric aluminum fluoride solution and Duraphat varnish showed a high uptake of fluorine in the enamel with the highest concentration in the surface layer. Fluor Protector and the toothpastes showed a considerably lower fluorine uptake. After immersion in artificial saliva of the specimens, the concentration of fluorine in the enamel decreased.
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| 10. |
- Mellander, Mats, 1947, et al.
(författare)
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Mineralization defects in deciduous teeth of low birthweight infants.
- 1982
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Ingår i: Acta paediatrica Scandinavica. - 0001-656X. ; 71:5, s. 727-33
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Tidskriftsartikel (refereegranskat)abstract
- A group of 91 children with birthweights below 2000 g and 48 healthy full-term children, reference group, were examined for mineralization disturbances of the enamel of deciduous teeth. Perinatal data were collected retrospectively from obstetric and neonatal records. Within the low birthweight group, children with enamel hypoplasia had on the 5% level a significantly lower intake of breast milk during the first week of life than children without disturbances. The only perinatal complication associated with development of mineralization defects was IRDS. Infants with IRDS, however, had a significantly lower intake of breast milk during the first week of life than low birthweight without IRDS. A low frequency of enamel defects was found in the growth-retarded sub-group of the low birthweight infants. These infants had a significantly higher intake of breast milk during the first week compared to the AGA-group. A seasonal variation was found, with the highest prevalence of mineralization disturbances in infants born during winter months. It is concluded that the occurrence of mineralization defects of the deciduous teeth in LBW infants seems to be dependent upon the amount of breast milk given during the early neonatal period and also possibly in which season of the year they are born.
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