Abstract
We compared the structure, composition, and crystal between subgigival dental calculus and dental calculus of periodontal lesion combined with endodontic lesion. In the dental calculus of periodontal lesion combined with endodontic lesion, spherical structures were commonly observed. EPMA analysis revealed calculus composition to be, in decreasing amounts, Ca, P, Na and Mg. The dental calculus of periodontal lesion combined with endodontic lesion contained S and Al, with Si and Fe detected as trace element. The Ca/P molar ratio was 1.52 on average in the dental calculus of periodontal lesion combined with endodontic lesion and its value was similar to W. The Ca/P molar ratio was 1.50 on average in the older group and its value was similar to W. The Ca/P molar ratio was 1.75 on average in the younger group and its value was similar to HA. HA was detected in the younger group, and W was detected in both the dental calculus of periodontal lesion combined with endodontic lesion and the older group by X-ray diffraction method.
