The Histopathology of Enamel Caries in Fluorosed Deciduous Teeth

Currently, dental caries is the main reason of patient visits to dentists. A great deal of scientific work is dedicated to the study of enamel caries. The reason for this is the necessity for more detailed study of the pathogenesis of dental caries and other pathological processes occurring in tooth enamel. The application of modern high-technological methods of research has made it possible to study enamel structure in detail. Hard dental tissues are composed of organic and inorganic components and water. The organic substance consists of proteins, lipids, and carbohydrates. At different ages, caries intensity may vary. The carious process often develops during the first months after the tooth eruption but much less in adulthood and old age. These processes are mainly associated with the mechanisms of ionic exchange between the oral cavity and hard dental tissues. Different groups of teeth are differently affected by the carious process. Previous studies have revealed that age is an important factor influencing on the structure and chemical composition of hard dental tissues. Various recent works at the Department of Therapeutic Dentistry of Voronezh N.N. Burdenko State Medical Academy (VSMA) have studied not only the structural-morphological features of the enamel in children and adults but also the level of metabolic processes inside it. As a result of aging, teeth change both the enamel structure and the level of its ionic processes, but unfortunately, these changes have not been well characterized in teeth with conventional age-specific differences.

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“…They extend from the enamel-dentine junction and penetrate into about one-third of the enamel thickness [21]. …”

Section: Introductionmentioning

confidence: 99%

Age-related differences of tooth enamel morphochemistry in health and dental caries

2015

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“…The laminated zones as observed by polarized light tnicroseopy (1,3,(5)(6)(7) and niicroradiography (1,(4)(5)(6)(7) were considered to be better mineralized than the surrounding carious enamel of the body of the lesion. Such better mineralized laminations have also been observed in artificially produced lesions in vivo (8), in vitro (9)(10)(11)(12) and in enamel caries in fluorosed teeth (13). Since the ultrastrueture of the laminated zones with respect to the state of mineralization has not been re-ported possibly due to the difficulties in tnaking ultrathin samples from these zones, their investigation was undertaken using the improved seleeted area argon-ion-beam thinning technique whieh produees only minimal artifactual damage in specimens.…”

mentioning

confidence: 65%

Laminated zones in carious human dental enamel

Palamara

Phakey

Rachinger

et al. 1986

J Oral Pathology Medicine

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Palamara J, Phakey PP, Rachinger WA, Orams HJ. Laminated zones in carious human dental enamel. J Oral Pathol 1986: 15: 109-114. Abstract -Laminated zones within the body of carious lesions were studied by polarized light microscopy and ttansmission eleetron microscopy. Areas from within and surrounding the laminated zones, precisely selected using light microscopy, were argon-ion-beam thinned and examined by transmission electron microscopy. Laminated zones were present in ~7% of the samples studied. Polarized light mieroseopy showed variation in mineralization from zone to zone and the enamel surrounding the zones in the body of the lesion. Laminated zones whose central region showed -1% of spaee when examined in air and whose boundaries showed -2-4% of space when itnbibed in quinolinc were selected for ultrastruetural studies. Eleetron microscopy showed the laminated zone to be less demineralized than the surrounding enamel in the body of the lesion. The ultrastructure of their central regions was similar to healthy enamel but their boutidaries showed demineralization which inereased into the body of the lesion. Within the central region of lamination there was greater evidenee of resistance to demineralization rather than the presence of remineralization.

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“…The primary pathological fi nding of fl uorosed enamel is a subsurface porosity, along with hyper-and hypomineralized bands within the forming enamel (Fejerskov et al 1974(Fejerskov et al , 1975(Fejerskov et al , 1977(Fejerskov et al , 1979(Fejerskov et al , 1991Kidd et al 1981 ;Kierdorf et al 1993 ). Clinically, mild cases of dental fl uorosis are characterized by a white opaque appearance of the enamel, caused by increased subsurface porosity.…”

Section: Dental Fluorosismentioning

confidence: 99%