Analysis of enamel microhardness at various hard tissue states and depth of the microfissures
| Autor: | S. P. Yarova, I. I. Zabolonaya |
|---|---|
| Jazyk: | English<br />Russian<br />Ukrainian |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Zaporožskij Medicinskij Žurnal, Iss 4, Pp 117-120 (2013) |
| Druh dokumentu: | article |
| ISSN: | 2310-1210 2306-4145 |
| DOI: | 10.14739/2310-1210.2013.4.16916 |
| Popis: | In clinical practice are often diagnosed precervical lesions: wedge-shaped defects and cracks. Long phases of the confrontation of the body as a damaging influence in the formation of thicker tissue sections of higher salinity, density and sustainability occur prior to the integrity of the enamel. Micro-hardness is one of the important characteristics of the micro-mechanical strength of the tooth-related physical and chemical changes that occur in the enamel as a result of external and internal influences. The purpose of the study was to identify possible differences in the micro-hardness of enamel, depending on the depth of fissures and pathology of hard tissues of the teeth. We investigated the longitudinal sections of 27 teeth (18 - intact, 5 - with wedge-shaped defect, 4 - with cervical caries) of both jaws removed for clinical indications in patients aged 25-54 years, who were diagnosed three types of fractures (SB Ivanov, 1984). Hardness was determined in the outer, middle, inner layers of enamel in three topographical locations: in the cusp tip (cutting edge) of the tooth equator and neck as in previously described technique (S. Remizov, 1965). The obtained results showed decrease in strength with micro-cracks enamel, compared with apparently intact ones, on the average 10% more in the incisal areas (tuber), less - in the equatorial zone. In intact teeth with micro-cracks and having a wedge-shaped defect the indices differed significantly depending on the depth of the defects of the cutting edge (tuber) and the equator: they were the smallest in the deep type III micro-cracks (p |
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