Although generic medical materials are often used, limited information is available. Aim of this study is to evaluate safety and economy of absorbable synthetic suture with needle B (B) as generic medical materials. Sample evaluation showed that average scores of B is located in the middle of good and accepted and B was adopted. Absorbable synthetic suture with needle A (A) which started previously was reduced the price and became the continuation adoption. Estimated reduction was 11 million yen. Reduction = ∑ - (∑ A + ∑ B) ;∑ = original price of A x (use number of A + B), ∑ A= price of A x (use number of A), ∑ B = price of B x (use number of B). From the hospital incident reporting system, 18 cases which related needle or thread were extracted. There were two incident reports about A, and no report about B. There was much number of the use of heavy thread B in abdominal closure. Our results show that it is possible to evaluate safety and economy of generic medical materials by analyzing the user’s sample check and actual use in absorbable synthetic suture with needle.

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The purpose of this study is to examine the effect of the lubrication on the autoclaving (132°C, 6min) of the dental air-turbine hand-pieces (THP). Using new 15 THPs, were sucked intentionally dye solution or blood or alcohol, we examined the emission effect by lubrication and the change of rotation speed. The results were as follows:
1) The amount of dye solution remaining in the bearing, was quantified by spectrophotometry (539nm). The average emission rate calculated for the THPs without lubrication, was 92.0% in the hand-spray lubrication followed by non-load rotation, and was 93.5% in the lubrication apparatus, no significant difference was observed between the two methods.
2) In THPs sucked alcohol with lubrication and autoclaving, rotation speed decreased because of the oil layer’s loss.
3) THPs sucked blood, which treated with lubrication prior to autoclaving, was maintained in rotation speed, and their bearing were almost cleaned.
However the THPs without lubrication couldn’t be rotated, and their bearing were contaminated heavily with blood coagulum.
In conclusion, this study clarified that lubrication had emission effect more than 90%, and lubrication prior to autoclaving is useful to prevent the shortening the life-cycle of THPs by autoclaving.

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