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KMID : 0354619930050010137
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Journal Dankook Dental Research Institute
1993 Volume.5 No. 1 p.137 ~ p.150
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Study of the Changes in Canal Wall Thickness and the Area of the Cross Section of the Root in the Mesial Root of the Mandibular Molar Canal Preparation
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Abstract
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Using a model system that can compare the before and after of canal preparation in same tooth, we measured the area of the cross section, and canal wall thickness of the distal portion of the mesial root of the mandibular molar, and compared the
amount
of reduction in the canalusing hand flared preparation and Gates-Glidden drill flared preparation according to the changes in the MAF.
@ES The results were as follows.
@EN 1. After canal preparation the canal wall thickness had no significant difference between the hand flared preparation and Gates-Glidden drill flared preparation.
2. The canal wall thickness, after canal preparation, there was no significant difference between the sizes of the MAF.
3. The area variation range of each cross section of root had no significant difference between MAF size and methods of canal preparation.
4. After canal preparation, the frequency of the canal wall thickness under 0.5mm showed 3.5mm below the furcation to the most frequent with statistical significance (p<0.05), 2mm below the furcation and 5mm below the furcation followed but
there
was
no statistical significance.
5. The danger zone of the mesial root of the mandibular molar seems to be around 3.5mm below the furcation.
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KEYWORD
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