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| 2. |
- Bäckman, B, et al.
(författare)
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The absence of correlations between a clinical classification and ultrastructural findings in amelogenesis imperfecta.
- 1993
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Ingår i: Acta odontologica Scandinavica. - 0001-6357. ; 51:2, s. 79-89
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Tidskriftsartikel (refereegranskat)abstract
- This study was performed to examine whether a clinical classification of different phenotypes of amelogenesis imperfecta could be discernible at the ultrastructural level. Seventeen primary teeth from 16 children with hypomineralization, hypomaturation, or hypoplastic variants of the disease were collected for histologic studies of the enamel by means of polarized light microscopy, scanning electron microscopy (SEM), and secondary ion mass spectrometry (SIMS). Polarization microscopy showed that the enamel was hypomineralized; in six teeth a wavy configuration of the enamel prisms also appeared. Three histomorphologic main types could be discerned. In 10 of the teeth extensive hypomineralization of the bulk of the enamel was found. One tooth had an unusually thick enamel with only a thin normally mineralized surface layer. SIMS images showed less pronounced signals from Ca2+ and Na+ but with stronger signals from Cl- and CN-, representing the organic component of enamel. The SEM images showed an irregular prism pattern with marked interprismatic areas. Irrespective of the clinical appearance or the hereditary pattern the main findings were hypomineralized enamel with or without wavy bands. Neither of the analytical methods used in this paper distinguishes between the clinical phenotypes of amelogenesis imperfecta.
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| 3. |
- Klingberg, Gunilla, 1960, et al.
(författare)
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Dental behavior management problems in Swedish children.
- 1994
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Ingår i: Community dentistry and oral epidemiology. - 0301-5661. ; 22:3, s. 201-5
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Tidskriftsartikel (refereegranskat)abstract
- 4505 Swedish children aged 4-11 yr were surveyed regarding dental behavior management problems (BMP) and dental health. Dental charts were retrieved from clinics in the Public Dental Service in Göteborg, and data were then compiled regarding BMP, action against BMP, caries, fillings, use of local anesthetics, and number of missed appointments. Behavior management problems were found in 10.5% of the children, and were more common in the younger children, among children who missed appointments, and in children who received restorative treatment without local anesthetics. The BMP children had more carious and fewer filled surfaces. In 43.4% of the cases with BMP the strategy chosen was postponement of dental treatment or no measure taken.
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| 4. |
- Norén, Jörgen G, 1947, et al.
(författare)
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Intubation and mineralization disturbances in the enamel of primary teeth.
- 1993
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Ingår i: Acta odontologica Scandinavica. - 0001-6357. ; 51:5, s. 271-5
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Tidskriftsartikel (refereegranskat)abstract
- This study was undertaken to examine the effects of intubation on the enamel development of primary teeth in children intubated during the first 3 months of life. The teeth of 35 children were examined clinically for signs of defects. Dental enamel defects were seen in 26 (74%) patients; enamel hypoplasia was seen in 15 and enamel hypomineralization in 19 cases. In eight patients both enamel hypoplasia and hypomineralization were found. There was a preponderance of enamel defects in the right maxilla, which supports the hypothesis that an early trauma to mineralizing primary teeth caused by laryngoscope may lead to dental enamel hypoplasia.
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| 5. |
- Ranggård, L, et al.
(författare)
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Clinical and histologic appearance in enamel of primary teeth in relation to neonatal blood ionized calcium values.
- 1994
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Ingår i: Scandinavian journal of dental research. - 0029-845X. ; 102:5, s. 254-9
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this investigation was to study the relationship between low values of blood ionized calcium measured in the first days of life postpartum and the clinical and histologic appearance of enamel of primary teeth. Twenty-five healthy children selected on the basis of optimality with known blood values of ionized calcium from the first days of life participated in a dental examination at the age of 5 yr. Twenty-four of the children contributed one exfoliated tooth each, which was histologically examined. The infants had lower mean values of ionized blood calcium on days 1 and 3 than day 5 postpartum. Thirteen of the 25 children had enamel aberrations, mainly on one tooth each. The histologic examination showed normal overall enamel morphology. The neonatal line was present in all teeth, and these lines were mostly thin. The registered findings about the enamel morphology could not, in any case, be correlated with the measured values of neonatal blood ionized calcium.
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| 6. |
- Ranggård, L, et al.
(författare)
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Effect of hypocalcemic state on enamel formation in rat maxillary incisors.
- 1994
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Ingår i: Scandinavian journal of dental research. - 0029-845X. ; 102:5, s. 249-53
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Tidskriftsartikel (refereegranskat)abstract
- Several authors have proposed that hypocalcemia can interfere with amelogenesis, resulting in enamel aberrations. Therefore, the purpose of this investigation was to study the effects of a diet-induced hypocalcemic state in young rats on enamel formation of the maxillary incisors. The experimental rats were fed a special diet, free from vitamin D and very low in calcium. The control rats were fed a normal diet. The experimental period was 3 wk. After termination, the blood analysis showed that the experimental rats had developed hypocalcemia with very low values of both total and ionized blood calcium. The experimental rats were smaller than their controls after 3 wk, with smaller skulls and teeth. At the light microscope level, the enamel and the ameloblasts did not seem to be affected, except in one rat, the smallest, which showed enamel hypoplasias in both maxillary incisors and a delayed increase of the mineral content during the maturation stage process. It is concluded that the hypocalcemic state induced did not greatly affect enamel formation. However, occasional enamel aberrations may occur.
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| 7. |
- Ranggård, L, et al.
(författare)
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Parathyroid hormone and enamel formation in rat maxillary incisors.
- 1991
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Ingår i: Scandinavian journal of dental research. - 0029-845X. ; 99:2, s. 90-5
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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.
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| 8. |
- Sjögren, K, et al.
(författare)
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Salivary fluoride clearance after a single intake of fluoride tablets and chewing gums in children, adults, and dry mouth patients.
- 1993
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Ingår i: Scandinavian journal of dental research. - 0029-845X. ; 101:5, s. 274-8
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the present investigation was to compare the clearance pattern in saliva and the salivary stimulating effect of a new fluoride (F) chewing gum (Fluorette) with three other F products used in Scandinavia for many years for caries prevention. Concentration of F was determined in whole saliva in three groups of subjects: 1) children, 10-12 yr of age (n = 20), 2) adults (n = 20), and 3) dry mouth patients (n = 15), after a single intake of the two tablets, Dentan and Fludent, and the two chewing gums, Fluomin and Fluorette, all containing 0.25 mg F as NaF. Sucking was allowed until the tablets had been completely dissolved in the mouth. The chewing gums were used for 15 min. Saliva samples were collected from subjects expectorating 0.3-0.5 ml at nine different time intervals up to 45 min after the intake. There were some significant differences in the maximum F concentration, the area under the salivary fluoride concentration curve (AUC) when plotted against time, and the salivary stimulating effect among the four products, but as a whole they were small and probably of minor clinical importance. Among the various groups, the dry mouth patients showed the highest salivary F concentration. Thus, the main conclusion from this study is that the F tablets and chewing gums studied, including the new product Fluorette, had approximately the same clearance pattern in saliva and the same salivary stimulating effect. However, there were great variations among the different subjects.
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