Characteristics of some air-turbine handpieces

Taylor, D.F.; Perkins, Robert; Kumpula, John W.

doi:10.14219/jada.archive.1962.0173

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…The rpm of the air-turbine hand-piece might change during preparation. 4 22 26 27 However, Ercoli et al 31 reported that there was no significant change in the rpm values of the different rotary cutting instruments even if the same air-turbine handpiece was used. For this reason, the same handpiece was used and torque values were not monitored.…”

Section: Discussionmentioning

confidence: 99%

“…However, the cutting efficiency and durability of single-use diamond burs especially during full mouth preparations were not evaluated or specified in the literature either. 1 21 Previous studies were based on investigating cutting efficiency, 4 5 12 22 23 24 performance, 25 characteristics, 26 27 28 heat generation, 29 30 31 and abrasive properties 32 of various burs only. The purpose of this study was to identify the changing frequency, by determining the alterations on the surface of the diamond burs when used on different surfaces.…”

Section: Introductionmentioning

confidence: 99%

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What is the changing frequency of diamond burs?

2018

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PURPOSEThe purpose of this study was to determine the changing frequency of a diamond bur after multiple usages on 3 different surfaces.MATERIALS AND METHODSHuman premolar teeth (N = 26), disc shaped direct metal laser sintered CoCr (N = 3) and zirconia specimens (N = 3) were used in this study. Groups named basically as Group T for teeth, Group M for CoCr, and Group Z for zirconia. Round tapered black-band diamond bur was used. The specimens were randomly divided into three groups and placed with a special assembly onto the surveyor. 1, 5, and 10 preparation protocols were performed to the first, second, and third sub-groups, respectively. The subgroups were named according to preparation numbers (1, 5, 10). The mentioned bur of each group was then used at another horizontal preparation on a new tooth sample. The same procedure was used for CoCr and zirconia disc specimens. All of the bur surfaces were evaluated using roughness analysis. Then, horizontal tooth preparation surfaces were examined under both stereomicroscope and SEM. The depth maps of tooth surfaces were also obtained from digital stereomicroscopic images. The results were statistically analyzed using One-Way ANOVA, and the Tukey HSD post-hoc tests (α=.05).RESULTSAll of the groups were significantly different from the control group (P<.001). There was no significant difference between groups Z5 and Z10 (P=.928). Significant differences were found among groups T5, M5, and Z5 (P<.001).CONCLUSIONDiamond burs wear after multiple use and they should be changed after 5 teeth preparations at most. A diamond bur should not be used for teeth preparation after try-in procedures of metal or zirconia substructures.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

What is the changing frequency of diamond burs?

2018

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“…In view of the steep declining pattern of the cutting speed and the change in cutting effectiveness of bovine enamel with the increase in apphed load, it would be advisable to conduct the 5-s bovine enamel cut with a light force of less than 60 g, so that the cutting power of the rotating device, presumably defined by the product of the reduced handpiece speed and the torque of the driving mechanism under pressure (Taylor, Perkins & Kumpula, 1962), could be maximized. The light force cutting of natural tooth enamel will also have beneficial effects on the control of the cutting heat.…”

Section: Discussionmentioning

confidence: 99%

Dental cutting behaviour of mica‐based and apatite‐based machinable glass‐ceramics

Taira

Wakasa

Yamaki

et al. 1990

J of Oral Rehabilitation

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Some recently developed industrial ceramics have excellent machinability properties. The objective of this study was to evaluate the dental cutting behaviour of two machinable glass-ceramics, mica-containing Macor-M and apatite- and diopside-containing Bioram-M, and to compare them with the cutting behaviour of a composite resin typodont tooth enamel and bovine enamel. Weight-load cutting tests were conducted, using a diamond point driven by an air-turbine handpiece, While the transverse load applied on the point was varied, the handpiece speed during cutting and the volume of removal upon cutting were measured. In general, an increase in the applied load caused a decrease in cutting speed and an increase in cutting volume. However, the intensity of this trend was found to differ between four workpieces. Cutting Macor-M resulted in the second-most reduced cutting speed and the maximum cutting volume. Cutting Bioram-M gave the least reduced cutting speed and the minimum cutting volume. It was suggested that two machinable glass-ceramics could be employed as typodont teeth. This study may also contribute to the development of new restorative dental ceramic materials, prepared by machining.

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