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J Dent Res 45(4): 1033-1046, 1966
© 1966 International and American Associations for Dental Research
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Relationship between Hardness, Discoloration, and Microbial Invasion in Carious Dentin

TAKAO FUSAYAMA 1, KOICIHI OKUSE 1, and HIROYASU HOSODA 1

1 Tokyo Medical and Dental University Department of Operative Dentistry, Bunkyo-ku, Tokyo, Japan

For investigating the relationship between hardness, discoloration, and microbial invasion, freshly extracted teeth were vertically bisected, and the Knoop hardness and discoloration were examined on the section surfaces of one side; the microbiota were detected on the histologic sections from the other half. Findings were as follows: (1) the hardness of dentin of intact teeth was highest at approximately 450 µ from the enamel-dentin junction (K.H.N. 70 in average) and very low at the innermost layer (K. H. N. around 20), which was lower even than some infected soft dentin; (2) the hardness of dentin did not change due to the presence of enamel caries; ( 3) sclerotic or secondary dentins were more frequently and more apparently found with chronic decays than with acute decays; (4) softening was always first, discoloration next, and microbial invasion last; (5) the hardness of dentin at the discoloration front was lower in acute cases and higher in chronic cases. The distance from there to the softening front was greater in acute cases; (6) the hardness of dentin at the microbial front was lower in acute cases (minimum K.H.N. 4.4) and higher in chronic cases (maximum K.H.N. 61). The distance from there to the softening front was greater in acute cases (maximum 1,750 µ) and smaller in chronic cases (minimum 50 µ); (7) the same relationship between softening, discoloration, and microbial invasion was found in smooth surface caries as in fissure caries; and (8) the distances between the three fronts observed obliquely to dentinal tubules were generally smaller than those parallel to tubules.

Submitted on April 27, 1965




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