チオコールラバー印象材のホログラフィーによる検討 : 環境, 操作条件の差がその精度に及ぼす影響について
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In the present study, the author addressed himself tothe elucidation of such factors as temperature change and constraint of impression trays on thiokol rubber impression by an application of laser holographic technique, including manipulative conditions such the thickness of the material, times of infusion and removal as well in relation to their possible effects on impression material surfaces that would correspond to the occlusal surfaces in clinical environment. As a result of this experimental study, the author obtained the conclusions as follows. 1. An internal temperature change of the material itself under different environmental factors registeredan increase of about 3.0〜4.0 degrees C in 10 minutes from the commencement of trituration at 23.0 degrees C. When the material was triturated at 37.0 degrees C and stored under this condition for 14 minutes and then exposed to ordinary room temperatuer (23.0 degrees C), an increase of temperature by 11.0 to 12.0 degrees C took place in about 15 minutes afterward. These maximum values showed gradual decreases and, in 80 to 100 minutes, they reverted to that of room temperature more or less. 2. Time-wise variations due to changes in environmental temperature were found to be twice as much when stored at 37.0 degrees C immediately after processing of the material as compared with room temperature environment of 23.0 degrees C. 3. Whon the presence and absence of a bonding material were compared, time-wise variations were anywhere from 7.9 to 23.9% less when a bonding material was employed. 4. Certain change was still observable in the material even after 360 minutes after the commencement of trituration. 5. Variations owing to differences in the thickness ofthe material and times of infusion and removal were confirmed to reveal different values respectively. 6. Within the scope of the present experimental study, the conditions that produced the minimum variations were that the thickness of the material was 1.0 mm, an infusion time of 2 minutes 30 seconds after the commencement of trituration and its subsequent removal in 26 minutes.
- 社団法人日本補綴歯科学会の論文
- 1982-04-01
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