抄録
Although the risk to human health is a generally recognized to be a social problem, asbestos is still the base material of pulp devitalizer employed in the dental clinic. In the search for a substitute, this study examines the clinical and clinicopathological properties of polyethylene fibers used as a trial base material.
1) For the clinical study, 60 human, vital, permanent teeth were divided into 3 experimental groups and investigated.
(1) Group in which pulp procedures were perfomed with modified Neo-Arsen Black
Success evaluation: Successful 70 %, Fairly successful 30%, Unsuccessful 0% Clinical evaluation: Good 60 %, Fair 40% Poor 0%
(2) Group in which pulp procedures were perfomed with modified Neo-Paraform Paste Success evaluation: Successful 50%, Fairly successful 50 %, Unsuccessful 0 % Clinical evaluation : Good 60 %, Fair 40 %, Poor 0%
(3) Group in which modified Neo-Parafrom Paste was used in desensitizing dentin hyperaes-thesia
Success evaluation : Successful 80 %, Fairly successful 20%, Unsuccessful 0%
Clinical evaluation: Good 60 %, Fair 40 %, Poor 0 %
2) For clinicopathological study, 20 human, vital, permanent teeth were divided into 2 expe-rimental groups and investigated.
(1) Group in which modified Neo-Arsen Black was used
Clinical evaluation : Good 90 %, Fair 10 %, Poor 0 %
Histopathological findings : In many cases, hyperemia, hemorrhage, conglutination of blood corpuscles, atrophy, and vacuolar of the odotoblastic layer were observed. Necrosis was observed in all cases.
(2) Group in which modified Neo-Paraform Paste was used
Clinical evaluation: Good 70%, Fair 30%, Poor 0%
Histopathological findings: In many cases, hyperemia, conglutiation of blood corpuscles, atrophy, and vacuolar of the odotoblastic layer were observed. Necrosis was observed in all case.
The results of this investigation show that polyethylene fibers have the same clinical effects (application value) as asbestos when used as a base material of pulp devitalizer.
