Comparison of wear resistance and hardness among different resin teeth

Xueying WU; Jiao SUN

ABSTRACT

BACKGROUND:

The wear resistance and hardness of artificial tooth would affect repairing effects in clinic. However, there is lack of professional standard for resin teeth in China.

OBJECTIVE:

To provide a theoretic foundation for the choosing of the resin teeth in clinic via comparing the wear resistance and hardness among 7 different resin teeth.DESIGN, TIME AND

SETTING:

A contrast observation. The experiment was performed at the laboratory of Mechanical Engineering College, Shanghai Jiao Tong University from November 2003 to May 2004.MATERIALS A total of 7 kinds of different resin teeth were selected, namely, hard multi-layer synthetic resin teeth (A); multi-layer synthetic resin teeth (B); synthetic resin teeth (C); EMDURA resin teeth (D); three-layer synthetic resin teeth (E); optostar four-layer synthetic resin teeth (F); and Cosmo HXL (G).

METHODS:

The wear test was processed by a pin-plate wear machine. The result was measured by the weight loss through wearing and the surfaces of the wear scar were observed by a scanning electronic microscope (SEM); hardness was measured by Knoop hardness. Meanwhile, the relativity between the hardness and wear resistance of resin teeth was analyzed.MAIN OUTCOME

MEASURES:

The wear resistance and hardness of resin teeth.

RESULTS:

According to the weight loss and SEM examination, the wear resistance of the different resin teeth was D>A>G>E>B>F>C; and the hardness of different resin teeth was D>A>G>E>F>B>C. The correlation coefficient between the weight loss and hardness was -0.888 (P < 0.01).

CONCLUSION:

The variation of the wear resistance of the resin teeth may influenced by their different components, molecular weight and manufacturel methods. There are positive correlation between the hardness and wear resistance of resin teeth.