An experiment on the attrition of acid demineralized dentine in vitro

Abstract

Background: A laboratory investigation was designed to test the hypothesis that acids increase the rate of wear caused by attrition on dentine. Methods: Dentine sections from 10 teeth were polished, cleaned in an ultrasonic bath and divided into 8 equally sized areas. The occlusal tip of a tooth, placed vertically in a wear machine and loaded at 150 N, was moved against each dentine section for 5000 return strokes with artificial saliva acting as a lubricant. Each dentine section was divided into 8 sections and half randomly immersed in a 1% citric acid solution (pH 2.3) for 20 minutes. The wear regime produced 8 wear scars in total per dentine sample. The volume of each wear scar was measured using a contacting digitizing profilometer. Results: A total of 80 wear scars were produced with 40 treated with acid and 40 acting as controls. The mean for wear volume of the dentine scars with acid was 4.84 lm 3 (1.38) and for the non-acid surface 2.95 lm 3 (0.86). This difference was statistically significant (p < 0.05). Conclusions: These results support the hypothesis that acids increase the rate of wear caused by attrition on dentine.

Effect of <i>Galla сhinensis</i> on the Wear Resistance of Dentine

“…Frictional pairs were created using sectioned and polished dentine specimens and a cusp of an opposing tooth to represent clenching and grinding action which is very common clinically. [1,2] The result (Table 1) indicated that the mean of wear depth of the dentine scars with GEC treatment was significant smaller than that of the control (p < 0.05). The smaller scars in GEC group suggested that GEC -treated surfaces had a lower wear rate than the control.…”

“…After specimen preparation the samples were cleaned in an ultrasonic bath for 2 minutes at room temperature. Then the tip of a bovine enamel cusp was placed vertically in a Enduratec wear machine (Bose 3100, USA) and positioned so that it moved against the dentine sections using the protocols described in our earlier study [1,2]. Each stroke of the Enduratec machine comprised a load of 150N, a frequency of 10Hz, stroke length 1mm and the regime continued for a total of 5000 return strokes with artificial saliva acting as a lubricant.…”

“…Each stroke of the Enduratec machine comprised a load of 150N, a frequency of 10Hz, stroke length 1mm and the regime continued for a total of 5000 return strokes with artificial saliva acting as a lubricant. The samples were remounted and moved to produce a new wear scar [1,2]. The wear regime produced 40 wear scars in total, 20 for experiment and 20 for control.…”

“…Wear of teeth texture is a natural and unavoidable process. Excessive wear may lead to a lack of perfect contact between opposite teeth, obliteration of chewing surfaces and even disturbance in the efficiency of the masticatory system [1][2]. Thus, how to improve the wear resistance of teeth has received much attention in the medical field [1][2][3][4][5][6][7][8][9][10].…”

New Directions in Dental Anthropology

“…Wear facets formed by attrition are different from those of abrasion in that attrition displays parallel striations during micrographic examination (Kaidonis et al, 1992). However, information on micrographic assessment of worn surfaces of attrition and erosion is scarce in the literature, and our understanding in this area is mainly based on experimental findings (Eisenburger and Addy, 2002;Eisenburger et al, 2004;Li et al, 2011;Manton et al, 2010;Meurman et al, 1991;Ranjitkar et al, 2008;Ranjitkar et al, 2009a;Ranjitkar et al, 2009b).…”