Abstract
Results from a systematic study of damage in material structures representing the basic elements of dental crowns are reported. Tests are made on model flat-layer specimens fabricated from various dental ceramic combinations bonded to dentin-like polymer substrates, in bilayer (ceramic/polymer) and trilayer (ceramic/ceramic/polymer) configurations. The specimens are loaded at their top surfaces with spherical indenters, in simulation of occlusal function. The onset of fracture is observed in situ using a video camera system mounted beneath the transparent polymer substrate. Critical loads to induce fracture and deformation at the ceramic top and bottom surfaces are measured as functions of layer thickness and contact duration. Radial cracking at the ceramic undersurface occurs at relatively low loads, especially in thinner layers. Fracture mechanics relations are used to confirm the experimental data trends, and to provide explicit dependencies of critical loads in terms of key variables: material - elastic modulus, hardness, strength and toughness; geometric - layer thicknesses and contact radius. Tougher, harder and (especially) stronger materials show superior damage resistance. Critical loads depend strongly (quadratically) on crown net thickness. The analytic relations provide a sound basis for the materials design of next-generation dental crowns.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2885-2892 |
| Number of pages | 8 |
| Journal | Biomaterials |
| Volume | 25 |
| Issue number | 14 |
| DOIs | |
| State | Published - Jun 2004 |
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Keywords
- Crowns
- Dental ceramics
- Materials design
- Plasticity
- Radial cracks
ASJC Scopus subject areas
- Biotechnology
- Bioengineering
- Biomedical Engineering
Cite this
Materials design in the performance of all-ceramic crowns. / Lawn, Brian R.; Pajares, Antonia; Zhang, Yu; Deng, Yan; Polack, Mariano A.; Lloyd, Isabel K.; Rekow, E. Dianne; Thompson, Van P.
In: Biomaterials, Vol. 25, No. 14, 06.2004, p. 2885-2892.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Materials design in the performance of all-ceramic crowns
AU - Lawn, Brian R.
AU - Pajares, Antonia
AU - Zhang, Yu
AU - Deng, Yan
AU - Polack, Mariano A.
AU - Lloyd, Isabel K.
AU - Rekow, E. Dianne
AU - Thompson, Van P.
PY - 2004/6
Y1 - 2004/6
N2 - Results from a systematic study of damage in material structures representing the basic elements of dental crowns are reported. Tests are made on model flat-layer specimens fabricated from various dental ceramic combinations bonded to dentin-like polymer substrates, in bilayer (ceramic/polymer) and trilayer (ceramic/ceramic/polymer) configurations. The specimens are loaded at their top surfaces with spherical indenters, in simulation of occlusal function. The onset of fracture is observed in situ using a video camera system mounted beneath the transparent polymer substrate. Critical loads to induce fracture and deformation at the ceramic top and bottom surfaces are measured as functions of layer thickness and contact duration. Radial cracking at the ceramic undersurface occurs at relatively low loads, especially in thinner layers. Fracture mechanics relations are used to confirm the experimental data trends, and to provide explicit dependencies of critical loads in terms of key variables: material - elastic modulus, hardness, strength and toughness; geometric - layer thicknesses and contact radius. Tougher, harder and (especially) stronger materials show superior damage resistance. Critical loads depend strongly (quadratically) on crown net thickness. The analytic relations provide a sound basis for the materials design of next-generation dental crowns.
AB - Results from a systematic study of damage in material structures representing the basic elements of dental crowns are reported. Tests are made on model flat-layer specimens fabricated from various dental ceramic combinations bonded to dentin-like polymer substrates, in bilayer (ceramic/polymer) and trilayer (ceramic/ceramic/polymer) configurations. The specimens are loaded at their top surfaces with spherical indenters, in simulation of occlusal function. The onset of fracture is observed in situ using a video camera system mounted beneath the transparent polymer substrate. Critical loads to induce fracture and deformation at the ceramic top and bottom surfaces are measured as functions of layer thickness and contact duration. Radial cracking at the ceramic undersurface occurs at relatively low loads, especially in thinner layers. Fracture mechanics relations are used to confirm the experimental data trends, and to provide explicit dependencies of critical loads in terms of key variables: material - elastic modulus, hardness, strength and toughness; geometric - layer thicknesses and contact radius. Tougher, harder and (especially) stronger materials show superior damage resistance. Critical loads depend strongly (quadratically) on crown net thickness. The analytic relations provide a sound basis for the materials design of next-generation dental crowns.
KW - Crowns
KW - Dental ceramics
KW - Materials design
KW - Plasticity
KW - Radial cracks
UR - http://www.scopus.com/inward/record.url?scp=1042264203&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1042264203&partnerID=8YFLogxK
U2 - 10.1016/j.biomaterials.2003.09.050
DO - 10.1016/j.biomaterials.2003.09.050
M3 - Article
C2 - 14962567
AN - SCOPUS:1042264203
VL - 25
SP - 2885
EP - 2892
JO - Biomaterials
JF - Biomaterials
SN - 0142-9612
IS - 14
ER -