Effects of repeated hand instrumentation on the marginal portion of a cast gold crown

Journal of Periodontology
H YagiS Murai

Abstract

A study was conducted to evaluate the effects of repeated hand instrumentation on the marginal portion of a cast gold crown. Seven extracted periodontally diseased premolars were used. The finishing line of the preparation was placed on the root surface and then the crown was cast and cemented in the usual manner. One proximal surface of each sample was divided into 2 areas: root planing (RP) area and RP plus polishing (RPP) area. The marginal portion of the crown was measured to give a baseline value using a surface roughness- and profile-analyzing system. Then, the marginal portion was painted with a waterproof pen. RP was performed to remove paint in the RP area with the curets. In the RPP area, RP followed by polishing was done by silicone polishing points and a rubber cup with polishing paste. The relevant procedures and measurements were repeated 3 times in each area. Changes in the sample roughness and profile were evaluated and compared between the 2 techniques. The results showed that repeated instrumentation altered the surface of the marginal portion of the cast gold crown, resulting in increased roughness in both areas (P < 0.01). However, the roughness of the RPP area was considerably restored to the baseline value...Continue Reading

References

May 1, 1979·Journal of Periodontology·J W KnowlesS P Ramfjord
Sep 1, 1977·Journal of Periodontology·B M Pennel, J G Keagle
Jun 1, 1976·British Dental Journal·A R Leon
Nov 1, 1976·The Journal of Prosthetic Dentistry·J C Metzler, H H Chandler
Apr 1, 1975·Journal of Clinical Periodontology·S NymanJ Lindhe
May 1, 1990·Journal of Periodontology·N B ColdironR F Caudill
Sep 1, 1973·Journal of Periodontology·R F Wilkinson, J E Maybury
Mar 1, 1966·The Journal of Prosthetic Dentistry·G J Christensen
Sep 1, 1966·Journal of Periodontology·E Green, S P Ramfjord
Oct 1, 1980·Journal of Periodontology·M K Jeffcoat, T H Howell
Aug 1, 1981·Journal of Clinical Periodontology·P Axelsson, J Lindhe
Jan 1, 1982·Journal of Periodontology·S P RamfjordJ W Knowles
May 1, 1964·The Journal of the American Dental Association·B S MOSKOW, E BRESSMAN

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