Date of Award

Summer 2001

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Dental Hygiene

Program/Concentration

Dental Hygiene

Committee Director

Deborah Bauman

Committee Member

Lynn Tolle-Watts

Committee Member

Jerry Garnick

Call Number for Print

Special Collections LD4331.D46 R83 2001

Abstract

Purpose: The purpose of this study was to determine if there are statistically significant differences between the Arkansas sharpening stone and the Ida-Hone ceramic sharpening stone in producing a sharper cutting edge on dental curets, and to determine if there is a statistically significant difference between the degree of root smoothness achieved by the sharpened curet cutting edges on extracted human teeth.

Methods: A two-group, randomized subject (n=39), double blind, post-test only design was employed using 39 factory new Hu-Friedy 11/12 gracey curets. Curets in group one were sharpened using the Ida-Hone ceramic stone, curets in group two were sharpened using the Arkansas stone. All curets were used to root plane a 3 x 3-mm section of root surface of an extracted human tooth that was randomly assigned to each instrument. The curet cutting edges were examined under scanning electron microscopy (SEM) at 500x and 2000x magnification to measure the edge-width and evaluate the edge for irregularities, respectively. The corresponding root surfaces were examined under SEM at 500x magnification and graded using a modified version of Krupa-Lavigne's (1988) categories of root smoothness.

Results: The mean edge-width of the curet cutting edges sharpened by the Ida-Hone stone was 3.35 (s.d. 4.16) microns and the mean edge-width of the curet cutting edges sharpened by the Arkansas stone was 1.89 (s.d.1.26) microns evaluated under 500 magnification. Analysis of the mean edge-widths using Student's independent t-test revealed no statistically significant difference (p=0.05) between the two groups. The mean number of irregularities along a ten-micron segment under 2000x magnification of the cutting edges of curets sharpened with the Ida-Hone stone was 2.83 (s.d. 2.62). Curets sharpened with the Arkansas stone had a mean number of irregularities along a ten-micron segment under 2000x magnification of the cutting edges of 2.83 (s.d. 2.09). A Student's independent t-test revealed no statistically significant difference (p=0.05) in the mean number of irregularities between the two groups. Chi-square analysis (p=0.05) of root smoothness revealed no statistically significant difference between the groups.

Conclusions: The Ida-Hone ceramic stone is equally as effective as the Arkansas stone in achieving cutting edges with few irregularities on Hu-Friedy 11/12 gracey curets, and in achieving equally smooth root surfaces on extracted human teeth.

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DOI

10.25777/qa4d-3f64

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