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

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

View larger version (15K): [in this window] [in a new window]   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, o = angle between the 2 points before cutting, f = angle between the 2 points after cutting, o = distance between the 2 points before cutting, and f = distance between the 2 points after cutting.

View larger version (11K): [in this window] [in a new window]   Figure 2. The change in the circumferential residual stress (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.

View larger version (7K): [in this window] [in a new window]   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.

Journal of Dental Research, Vol. 85, No. 10, 945-949 (2006)
DOI: 10.1177/154405910608501015


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