摘要:

Abstract.Cross‐sections of bovine incisor root dentin, 0.2 mm thick, were decalcified by ethylenediaminetetracetate at pH 7.4. After 2‐day immersion in recalcifying solution (3.75 mM Ca, 1.67 mM P, 22 mM CO3, 155–160 mM NaCl, pH 7.2, and 28°C) the previously decalcified dentin contained 32 % of the calcium phosphate of natural adult bovine dentin. Electron micrographs showed the deposition of minerals in the previously decalcified dentin matrix after immersion in the recalcifying solution. The matrix near the cemental surface appeared recalcified. Globular appearing mineral deposits occurred in the uncalcified matrix. The mineral deposits in the intertubular matrix apparently indicate sites of nucl

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01702.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Abstract.The chemical treatment of tooth surfaces to improve bonding of dental materials to enamel and dentin is one of the approaches in overcoming the lack of adhesion of the available restorative materials to tooth structure. The acid etch technique is now an accepted procedure in restorative and preventive dentistry and for the direct bonding of orthodontic attachments. The pulpal response elicited by one of the conditioning agents, 50 % H3PO4applied for 1 minute, was investigated in the teeth of the vervet monkey. The differences between most of the criteria used to evaluate the pulpal responses in acid‐treated and control teeth at three time intervals, namely 4, 14 and 42 days, were statistically significant. These results suggest that a protective lining should be used to cover exposed dentin before etching adjacent enamel surfaces with 50 % H3PO

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01703.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Abstract.White enamel patches on approximal surfaces of human teeth were examined with a scanning electron microscope following the removal of plaque. The affected areas disclosed a honeycomb‐like structure constructed of enamel prisms, the cores of which were preferentially dissolved. The defects resembled those due to acid decalcificatio

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01704.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Abstract.Hyalin bodies, present in a proportion of 427 jaw cysts, were examined by histological, histochemical and electron microscopical methods. Their overall prevalence in odontogenic cysts was 11 % and all the bodies were confined to the cyst epithelium. The histochemical results were generally in agreement with existing reports of reactions in both hyalin bodies and dental cuticle. An ultrastructural examination of 10 specimens revealed a close relationship of epithelial cells to at least one surface of each body, an attachment being mediated by hemidesmosomes and a basal lamina. The circular bodies surrounded so‐called “granular material” which appeared to be composed of degenerating cellular debris and which was sometimes calcified. Curved, elongate bodies bordered cholesterol clefts in the epithelium or showed evidence of having done so at an early stage in their formation. Existing concepts which attribute the origin of hyalin bodies to thrombosed blood vessels or to keratinizing epithelium are refuted, mainly on ultrastructural grounds. It is proposed that hyalin bodies are a secretion from odontogenic epithelium stimulated by cholesterol or cellular d

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01705.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01706.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY