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Microhardness and Ca:P ratio of carious and Carisolv™ treated caries‐affected dentine using an ultra‐micro‐indentation system and energy dispersive analysis of x‐rays — A pilot study
Author(s) -
Sakoolnamarka R.,
Burrow MF,
Swain M.,
Tyas MJ
Publication year - 2005
Publication title -
australian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.701
H-Index - 71
eISSN - 1834-7819
pISSN - 0045-0421
DOI - 10.1111/j.1834-7819.2005.tb00368.x
Subject(s) - indentation hardness , molar , dentistry , carious lesion , indentation , materials science , electron probe microanalysis , statistical analysis , dentin , scanning electron microscope , medicine , composite material , enamel paint , microstructure , mathematics , statistics
Background : This study aimed to evaluate microhardness and chemical analysis of carious and caries‐affected dentine. The hypothesis tested was that calcium:phosphorous (Ca:P) ratios correlate with microhardness values. Methods : Four carious human third molars were sectioned through the caries lesion in the mesiodistal longitudinal plane. One half of each lesion underwent carious dentine removal using Carisolv™ gel. The cut surfaces were polished, microhardness tested using an Ultra‐Micro‐Indentation System (UMIS) and elemental analysis performed using energy dispersive analysis of x‐rays (EDAX). Results : The microhardness of carious dentine decreased gradually towards the cavity floor, but that for caries‐affected dentine showed more variation with depth, having a mean hardness of (0.63±0.18) GPa. Ca:P ratios of carious dentine varied among the four specimens. The mean Ca:P ratio of caries‐affected dentine was 1:2.03±0.08. The hypothesis was accepted for active lesions. Conclusions : The use of Carisolv TM to excavate carious tissue can be as effective as rotary instrumentation.