The Influence of Antagonist Standardization on Wear

Abstract

For differences among materials to be easily detected, low variation in in vitro wear tests is desirable. The working hypothesis of this paper was that antagonists standardized for shape and size and according to materials would show mean values similar to those found in natural, non-standardized cusps, and that standardization would lead to a reduction in mean variation. First, the shapes and sizes of palatal cusps of non-erupted human upper third molars were measured. The cusp cupola was best described by the formula y = 0.001 x2 and was symmetrical around the axis of rotation. Up to 200 μm of the y-axis, this parabola corresponded best to a ball radius of 0.6 mm. Based on this information, standardized antagonists were fabricated from both human enamel and steatite. Wear in the occlusal contact area and the wear of opposing conventional ceramic and fine hybrid composite, respectively, were quantified in a computerized chewing simulator. As a control, natural human enamel cusps were used. Standardization of enamel cusps did not reduce the variation of the resulting wear compared with that of non-standardized enamel antagonists. Furthermore, standardization led to significantly different results both in the antagonists and in the opposing restorative materials. Thus, natural enamel antagonists are preferable for the simulation of wear in the occlusal contact area.

Keywords

antagonist standardization wear in vitro test steatite enamel

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References

Bjorn H. , Lindhe J. (1966). On the mechanics of toothbrushing. Odontol Revy 17:916.

De Gee AJ , Pallav P. , Davidson CL (1986). Effect of abrasion medium on wear of stress-bearing composites and amalgam in vitro. J Dent Res 65:654-658.

DeLong R. , Douglas WH (1983). Development of an artificial oral environment for the testing of dental restoratives: bi-axial force and movement control . J Dent Res 62:32-36.

Fang H. , Kunzelmann K-H. , Hickel R. , Petchelt A. (1993). Standardisierung des Antagonisten bei 2-Körper-Abriebsimulatoren . Dtsch Zahnärztl Z 48:481-483.

Finger W. , Thiemann J. (1987). Correlation between in vitro and in vivo wear of posterior restorative materials. Dent Mater 3:280-286.

Krejci I. (1992). Zahnfarbene Restaurationen. Munich: Hanser Verlag.

Krejci I. , Reich T. , Lutz F. , Albertoni M. (1990). In-vitro-Testverfahren zur Evaluation dentaler Restaurations systeme. 1. Computergesteuerter Kausimulator [An in vitro test procedure for evaluating dental restoration systems. 1. A computer-controlled mastication simulator.] [in German]. Schweiz Monatsschr Zahnmed 100:953-960.

Krejci I. , Lutz F. , Zedler C. (1992). Effect of contact area size on enamel and composite wear. J Dent Res 71:1413-1416.

Krejci I. , Lutz F. , Reimer M. , Heinzmann JL (1993). Wear of ceramic inlays, their enamel antagonists, and luting cements. J Prosthet Dent 69:425-430.

10.

Krejci I. , Gautschi L. , Lutz F. ( 1994). Wear and marginal adaptation of composite resin inlays . J Prosthet Dent 72:233-244.

11.

Lutz F. , Krejci I. , Barbakow F. (1992). Chewing pressure versus wear of composites and opposing enamel cusps. J Dent Res 71:1525-1529.

12.

Lambrechts P. (1983). Basic properties of dental composites and their impact on clinical performance (thesis). Leuven, Belgium: Catholic University of Leuven.

13.

Lehmann KM , Hellwig E. (1993). Einfuhrung in die restaurative Zahnheilkunde. Munich: Urban & Schwarzenberg.

14.

Radlanski RJ (1997). Morphogenetic and morphological aspects of prism structure in human dental enamel. Acta Med Dent Helv 2:86-95.

15.

Rice SL , Bailey WF , Pacelli PF 3rd , Blanck WR (1982). Influence of enamel stylus stiffness on the sliding wear behavior of a composite restorative. J Dent Res 61:493-496.

16.

Roulet J. -F (1987). Degradation of dental polymers. Basel: Karger.

17.

Schroeder HE (1992). Orale Strukturbiologie. 4th rev. ed. Stuttgart: Thieme.

18.

Wassel RW , Walls Awg , McCabe JF (1991). Frictional wear test (abstract). J Dent Res 70(Spec Iss):479.

19.

Willems G. (1992). Multi standard criteria for the selection of potential posterior composites (thesis). Leuven, Belgium: Catholic Univesity of Leuven.