Abstract: A lubricant delivery system for a dental handpiece, the dental handpiece having an air inlet tube having a predetermined internal shape in the vicinity of an open end portion thereof. The lubricant delivery system comprises a squeezable sealed capsule which includes a main body portion and a necked down portion extending from the main body portion. The necked down portion is smaller than the internal shape of the air inlet tube and is insertable into the open end of the air inlet tube. A passage is formed in the necked down portion extending from the main body portion to a tip end portion of the necked down portion. A lubricant fills at least a part of the squeezable main body portion. When the tip end portion of the necked down portion is opened, the opened necked down portion is inserted into the air inlet tube of the dental handpiece and the main body portion is squeezed to expel lubricant contained therein into the handpiece via the air inlet tube.

Abstract: A method and apparatus for checking the depth of cure of resins used to fill restorative cavities in teeth employs an opaque calibration box having two sections which can be placed adjacent each other to form, in the top of the apparatus, a plurality of holes of varying depths. A sample of a resin to be used in filling the restorative cavity is placed into a hole having a depth approximately the same as the depth of the restorative cavity in the tooth. The sample is then exposed to the curing light which will be used to cure the resin in the restorative cavity of the tooth. The sections of the calibration box are separated to determine the depth of cure at various points in time. The time required to cure the resin in the opaque calibration box determines the time required to cure the resin when it is inserted into a restorative cavity of approximately the same depth in the tooth.