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Residual Stress in Composites with the Thin-ring-slitting Approach

J.W. Park1,*, and J.L. Ferracane2

1 Department of Conservative Dentistry, College of Dentistry, Yonsei University, 146-92, Dogok-dong, Gangnam-gu, Seoul, 135-720, Korea; and
2 Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health & Science University, Portland, OR, USA


Figure 1
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  		Figure 1. Geometry of composite ring before (left) and after (right) slitting. a = inner radius of composite ring, b = outer radius of composite ring, r = radius measured at a point of the ring thickness, t = thickness of the ring, P1 and P2 = reference point for measurement of distance change, {alpha}o = angle between the 2 points before cutting, {alpha}f = angle between the 2 points after cutting, {delta}o = distance between the 2 points before cutting, and {delta}f = distance between the 2 points after cutting.

 

Figure 2
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  		Figure 2. The change in the circumferential residual stress ({sigma}{theta}ave) for Z100, Herculite, and Heliomolar. The ring was cut at 10 min (solid line) and 24 hrs (dotted line) after final curing. Stress was measured at five-minute intervals until 60 min and then at 2 hrs and 24 hrs.

 

Figure 3
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  		Figure 3. Correlation of the circumferential residual stress between the thick- (n = 14) and thin-walled (n = 10) composite rings. The ring of each composite material (Z100, Herculite, Heliomolar) was cut at 1 hr and 24 hrs and measured 24 hrs later.

 




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