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Journal of Dental Research
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Does Layering Minimize Shrinkage Stresses in Composite Restorations?

R.H. Kuijs1,*, W.M.M. Fennis2, C.M. Kreulen2, M. Barink3 and N. Verdonschot3

1 (PCT 117) Department of Preventive and Community Dentistry and Pedodontology, University Medical Centre Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands;
2 Department of Oral Function and Prosthetic Dentistry, University Medical Centre Nijmegen, The Netherlands; and
3 Orthopaedic Research Laboratory, University Medical Centre Nijmegen, The Netherlands;


Figure 1
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  		Figure 1. The different restorative techniques. Each color represents a new composite layer. (A) Bulk chemically cured and bulk light-cured. (B) Central-periphery sequence. (C) Central-periphery sequence, adapted. (D) Periphery-central sequence. (E) Periphery-central sequence, adapted.

 

Figure 2
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  		Figure 2. A representative distribution and location of diverse stresses (MPa). (A) Maximal principal stress in the tooth. (B) Maximal principal stress in the tooth-restoration complex. (C) Shear stress at the interface.

 

Figure 3
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  		Figure 3. Shear stresses (MPa) in the tooth tissues and composite for each restorative technique. (A) Enamel, (B) dentin, and (C) composite.

 

Figure 4
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  		Figure 4. Interface surface area (%) with shear stresses (MPa) for the different restorative procedures. Dotted lines mark the 2- and 12-MPa cut-off values.

 

Journal of Dental Research, Vol. 82, No. 12, 967-971 (2003)
DOI: 10.1177/154405910308201206
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