Title: 0896 - Wear Simulator to Evaluate Wear Characteristics of Dental Restorative Materials


Saloni Kachhara (Presenter)
Saveetha Dental College

Aravind Kalambettu, Saveetha Dental College
Abby Abraham, Saveetha Dental College


Objectives: To design an instrument that incorporates the to and fro motion.
To evaluate and compare the wear properties of metal, ceramic and acrylic crowns.
To demonstrate the effectiveness of the instrument in evaluating wear properties of different restorative materials.

Methods: Effectiveness of wear simulator was evaluated by comparing the wear properties of 3 different materials against natural teeth namely, heat cure acrylic (Group I); Cobalt chromium (Co-Cr) alloy (Group II) and Porcelain fused to metal (PFM) (Group III) with the sample size of 16 in each group. These samples were fastened onto the upper jig while natural tooth in the lower jig.
The wear test was performed under a load of 5Kg, and 25 cycles/minute. The test was done for 1200-1400 cycles with lubricant flow rate of 5 ml/min. After the end of wear cycles, tooth samples were removed and their surface roughness was analysed using the non-contact profilometer. Loss in volume was estimated using the TalyMap software.

Results: The values of surface roughness and volume loss estimated were statistically analysed using SPSS software to a test significance of 5%. One way ANOVA was used to compare the mean values between the 3 groups at 5% significance (α=0.05%), followed by Tukey HSD POST HOC test for multiple comparison.
The surface roughness of acrylic samples was the least (mean 0.14938 ± 0.05969) while that of Co-Cr samples (mean 0.2888 ± 0.06428) was slightly lower than that of PFM samples (mean 0.4031 ± 0.10051).
ANOVA test showed that there was significant difference in the amount of volume loss of the teeth between the three groups. F = 37.857
and P< 0.001. In the Tukey HSD Post Hoc test it was observed that there was statistically significant difference in the wear of antagonistic tooth between Group I samples and the other two groups. Interestingly, no statistically significant difference was found in the wear of antagonistic tooth between Groups II and III.

Conclusions: This study concluded that heat cured acrylic has the least wear potential amongst the 3 groups. It demonstrated that the prototype of the wear simulator developed in-house could be used for studying the wear potential of restorative materials used in dentistry. However, further modifications in design of the instrument is warranted before it could be validated and commercialized.


Download Image 1
Download Image 2


Mean 0.14938 0.24025 0.26938
N 16 16
Std. Deviation 0.025216 0.070648 0.033702
Mean 0.1663 0.2888 0.4031
N 16 16 16
Std. Deviation 0.05965 0.06428 0.10051

Student Presenter

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE