988 Wear abrasion testing methodology for denture teeth

Friday, March 23, 2012: 3:30 p.m. - 4:45 p.m.
Presentation Type: Poster Session
R.D. PERRY, M. HARSONO, A. BROWN, P. STARK, and G. KUGEL, Tufts University, Boston, MA

Objectives: To observe the wear of commercial available denture teeth using mouth motion simulator.

Methods: Four groups of 15 samples each of denture teeth were tested in this study. Prefabricated anterior denture teeth were embedded into composite with 9mm by diameter SEM stud. The flat surface of prefabricated tooth was obtained by grinding it up to 1200-grit silicon carbide paper. All samples were thermo-cycled for 5,000 cycles prior to testing. Samples were Hertzian contact loaded (4.75 mm diameter Al2O3-ball) using a mouth motion simulator (SD Mechatronik, Germany) with lift off from the specimen and 0.8 mm horizontal movement under 50N load inside a water chamber. Five samples were removed from each group at 50k, 100k and 200K chewing cycles and the depth and total volume lost were measure with 3D optical laser profilometers (UBM Corporation).

Statistically analysis was accomplished with two-way ANOVA. Significance was predetermined at p<.05.

Results: At 50K chewing cycles, group 1 showed the greatest mean of wear followed by group 4, 2 and 3, respectively. This pattern held for 100K chewing cycles but change slightly at 200K with Group 4 showed the greatest mean of wear followed by group1, 2, and 3.

 

 

Chewing cycles

50,000

100,000

200,000

Max Depth

(um±SD)

Vol Loss

(mm3±SD)

Max Depth

(um±SD)

Vol Loss

(mm3±SD)

Max Depth

(um±SD)

Vol Loss

(mm3±SD)

Group1

Potrait IPN (Dentsply)

52.68±16.99a

0.027±0.014a

69.68±18.07a

0.044+0.019a

90.67±18.98a

0.071+0.026a

Group2

Vita MFT (Vita Company)

31.05±3.69b

0.009±0.002b

53.46±6.41b

0.026+0.006b

85.07±8.34b

0.064+0.011b

Group3

Mondial 6i (Heraus)

24.13±4.07c

0.007+0.001c

42.85±6.44c

0.016+0.004c

68.51±11.46c

0.04+0.009c

Group4

Physiostar NFC (Condular USA)

39.04±3.16d

0.016+0.002d

62.63±4.81d

0.037+0.006d

98.13±8.61d

0.087+0.015d

Conclusions: Group 3 yield higher wear resistance in lower and higher chewing cycles compared with the other groups (P<0.001).

 

This abstract is based on research that was funded entirely or partially by an outside source: Heraeus Kulzer

Keywords: Denture, Prosthodontics, Teeth and Wear