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Pubmed for Handhelds

PUBMED FOR HANDHELDS

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  • Title: In vitro analysis of self-shearing retentive pins.
    Author: Collard EW, Caputo AA, Standlee JP, Duncanson MG.
    Journal: J Prosthet Dent; 1981 Feb; 45(2):156-9. PubMed ID: 6937657.
    Abstract:
    Combining stress, analysis, microscopic examination, mechanical testing of the shear mechanism, and retention of the Reten Pin leads to the following conclusions: 1. The suggested 0.006 inch pin-channel mismatch induces high lateral and apical stresses. Microscopically, this was seen to correlate with injury to the dentin. 2. The degree of retention was increased by using a smaller pin-channel mismatch. This correlates with smaller stresses and reduced dentinal damage. 3. The shear mechanism acts in a uniform manner, with a relatively small variation from the mean. It is suggested that for the best results the manufacturer should supply larger twist drills and pins with a somewhat deeper self-shearing groove to minimize apical involvement during shearing of the handle from the pin.
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