作者：
Leonard, DLCharlton, DGUSAF
Dent Corps Washington DC 20330 USA USAF
Sch Aerosp Med AFD Dent Invest Serv Brooks AFB TX 78235 USA
Background. The authors investigated the performance of nine commercially available highspeed air-turbine dental handpieces subjected to 1,000 simulated clinical uses and sterilizations. Methods. Six new handpieces fr...
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Background. The authors investigated the performance of nine commercially available highspeed air-turbine dental handpieces subjected to 1,000 simulated clinical uses and sterilizations. Methods. Six new handpieces from each of nine different models were subjected to simulated clinical use with a custom-made handpiece wear tester and then autoclaved. Ten parameters related to clinical performance (longevity, power, turbine speed, fiberoptic transmission, eccentricity, noise, chuck performance, visibility angle, interocclusal clearance and water coolant spray pattern) were measured at baseline and after 250, 500, 750 and 1,000 use/sterilization cycles. Results. Power, turbine speed, eccentricity and noise performance were statistically analyzed using one-way analysis of variance and Tukey post hoc pairwise comparison tests at the .05 significance level. At baseline, significant differences were found between models for all of these parameters. In general, from baseline to 1,000 cycles, the handpieces exhibited greater eccentricity and reduced fiberoptic performance. Longevity data analyzed by using Geban's generalized Wilcoxon test for comparison of survival distributions (alpha=.05) revealed significant differences between the handpiece models. Conclusions. The results of this study indicate that no handpiece model is superior to the others in all parameters evaluated. All models evaluated can be expected to perform for at least 500 clinical use/sterilizations, or approximately one year, if properly maintained. Clinical Implications. Clinicians need to be able to identify handpieces that can withstand repeated heat sterilization without loss of performance or longevity. The results of this study will aid clinicians in selecting handpiece models that meet their needs.
The treatment of some maxillofacial fractures has an incidence of glove perforation as high as 50%, with over 80% going unnoticed at the time of operation. We investigated double gloving and a glove perforation indica...
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The treatment of some maxillofacial fractures has an incidence of glove perforation as high as 50%, with over 80% going unnoticed at the time of operation. We investigated double gloving and a glove perforation indication system to ascertain whether the latter offered any additional protection. 1061 gloves used for 113 patients were examined, The outer glove perforation rate was significantly higher than the inner glove (0.48 compared with 0.10, P<0.0001). There were fewer unnoticed perforations in the glove perforation indication group than the standard surgical glove group (19% compared with 79%, P<0.0001). The indication system was most effective in wet operating fields. The perforation rate varied with the type of fracture and treatment. Mandibular fractures that were "hand-held', while bone-plated had a lower mean number of outer glove perforations/operation than fractures treated with temporary intermaxillary fixation (0.43 compared with 4.62, P<0.0001).
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