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J Dent Res 36(3): 479-491, 1957
© 1957 International and American Associations for Dental Research
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AN EVALUATION OF LUBRICANTS FOR DENTAL HANDPIECES AND CONTRA-ANGLES

G. T. CHARBENEAU D.D.S., M.S.1 and F. A. PEYTON D.SC.1

1 The School of Dentistry, University of Michigan, Ann Arbor, Mich.

This report has presented an evaluation of a representative group of lubricants for the dental handpiece and contra-angle. The viscosities of the liquid petroleum lubricants range from very light oils to heavy oils at 70° F., but become much less widely dispersed as their temperature approaches the operating temperature of the bearings. The greases react as a medium viscosity oil.

The fluids for use as sterilization media, thus far investigated, are either not stable or are of too great viscosity to provide good lubrication. A few of these synthetic fluids have some favorable characteristics and should be investigated more thoroughly.

Some factors to consider in the selection of a proper cleaner for the handpiece and contra-angle are discussed. The effect of belt tension on the speed of the handpiece and operating temperature of the bearings is pointed out.

It appears that from the evidence presented in this report, certain suggestions could be made for the proper day-to-day care of the handpieces and contra-angles, which are to be used at speeds up to 15,500 r.p.m. For operating speeds in excess of 15,500 r.p.m. further investigation should be accomplished.

1. Stoddard Solvent readily removes the petroleum and synthetic lubricants used in this study from the disassembled handpiece and contra-angle. This solvent is of relatively low toxicity, and with reasonable precautions it should present no great fire hazard. Ethyl alcohol might profitably be used as a secondary cleaner to remove moisture from gears and bearings.

2. Highly refined oils of a viscosity less than 150 Saybolt Universal Seconds appeared to provide acceptable lubrication in the 3 handpieces tested when applied sparingly to the disassembled instrument. Molybdenum disulfide appears to lubricate stainless steel on Pyrex sleeve bearings when used according to manufacturer's instructions.

3. The light oils provide adequate lubrication for the gears and bearings of 3 contra-angles tested when sparingly applied directly to these parts.

Submitted on March 6, 1956






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