geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

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


, : Effects of repeated hand instrumentation on the marginal portion of a cast gold crown. Journal of Periodontology 69(1): 41-46

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 by polishing after RP. Therefore, it is suggested that polishing after RP smoothes the marginal portion of the cast gold crowns and appears to be an efficient prophylactic system.

US$19.90

PMID: 9527560

DOI: 10.1902/jop.1998.69.1.41


Other references

Sevilla M.J.; Gonzalez Camacho A., 1982: Rotational deformation of an elastic earth. Revista de Geofisica (Madrid) 38(2): 179-187

Marshall, B.G.; Shaw, R.J., 1996: New technology in the diagnosis of tuberculosis. British Journal of Hospital Medicine 55(8): 491-434

Tsai I H.; Chuang K L.; Chuang J.L., 1986: Chymotrypsins in digestive tracts of crustacean decapods shrimps. 1. Both chymotrypsin and trypsin activities were abundant in different parts of the digestive tracts of Penaeus monodon, Penaeus japonicus, Penaeus penicillatus and less in those of Metapenaeus monoceros or Macrobrachium rosenbergii. 2. The digest...

Widdowson, E., 1958: Potato root diffusate production. This paper deals with some aspects of the root diffusate output of Arran Banner potatoes grown in 6 1/2-inch pots of coarse sand. The age of the plants affected the potency of the diffusate. Leachings taken about four weeks after the emergence of...

Blache, Céline.A.; Manuel, E.R.; Kaltcheva, T.I.; Wong, A.N.; Ellenhorn, J.D.I.; Blazar, B.R.; Diamond, D.J., 2013: Systemic delivery of Salmonella typhimurium transformed with IDO shRNA enhances intratumoral vector colonization and suppresses tumor growth. Generating antitumor responses through the inhibition of tumor-derived immune suppression represents a promising strategy in the development of cancer immunotherapeutics. Here, we present a strategy incorporating delivery of the bacterium Salmonel...

Sorokin, D.Y.; Muyzer, G., 2010: Haloalkaliphilic spore-forming sulfidogens from soda lake sediments and description of Desulfitispora alkaliphila gen. nov., sp. nov. An anaerobic enrichment with pyruvate as electron donor and thiosulfate at pH 10 and 0.6 M Na(+) inoculated with pasteurized soda lake sediments resulted in a sulfidogenic coculture of two morphotypes of obligately anaerobic haloalkaliphilic endos...

Kircher James E.; Gilliom Robert J.; Hickman R.E.ward, 1985: Loads and concentrations of dissolved solids, phosphorus, and inorganic nitrogen at U.S. Geological Survey National Stream Quality Accounting Network stations. U S

Newman-Morris, J., 1957: Sir John Newman-Morris. Medical Journal of Australia 44(18): 621-624

Aleshin, B., 1935: Investigations sur la metamorphose des Amphibiens. (French summ.). Journal de Biologie Moscou, 43: 461-487

Yashkov, Y.I.; Movchun, A.A.; Oppel, T.A.; Palman, A.D., 1999: Successful bariatric surgery in a patient who underwent more than 100 various operations. A 44-year-old woman who weighed 130 kg (height 158 cm, BMI 52) with a complicated psychiatric history was referred for obesity surgery because of severe sleep apnea, obesity hypoventilation syndrome with frequent pneumonias, arterial hypertension,...