The hardness and modulus of elasticity of primary molar teeth:an ultra-micro-indentation study
Objective: Baseline information on the mechanical properties of and the effect of load upon dental hard tissue is important in the development of successful dental materials. Existing methods of measuring such properties of tissue are subject to significant experimental error. This study reports on...
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| Veröffentlicht in: | Journal of dentistry Jg. 28; H. 8; S. 589 - 594 |
|---|---|
| Hauptverfasser: | , , , |
| Format: | Journal Article |
| Sprache: | Englisch |
| Veröffentlicht: |
England
Elsevier Ltd
01.11.2000
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| Schlagworte: | |
| ISSN: | 0300-5712, 1879-176X |
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| Abstract | Objective: Baseline information on the mechanical properties of and the effect of load upon dental hard tissue is important in the development of successful dental materials. Existing methods of measuring such properties of tissue are subject to significant experimental error. This study reports on the use of an Ultra-Micro-Indentation System (UMIS) to measure the hardness and elastic modulus of primary enamel and dentine.
Methods: Primary molar teeth were sectioned, set in resin and polished. Thirty indentations were made in enamel and dentine using a Berkovitch indentor, 15 of which were subject to a load of 50
mN and 15 to a load of 150
mN. An automated computerised system converted the force/penetration graph for each indentation in to a hardness vs depth graph from which values for the mean hardness and elastic modulus were calculated.
Results: Primary enamel had a mean hardness of
4.88±0.35
GPa
whilst the hardness of dentine was
0.92±0.11
GPa
The elastic modulus for enamel was
80.35±7.71
GPa
and that of dentine
19.89±1.92
GPa
. Using linear regression analysis a significant relationship could be shown between the hardness and the elastic modulus for both enamel and dentine when loaded to 150
mN but only for dentine at 50
mN (
P<0.05). In general the elasticity of tooth structure increased as the hardness increased.
Conclusion: The UMIS offers a simple and reproducible method of measuring basic mechanical properties of small samples of enamel and dentine. |
|---|---|
| AbstractList | Baseline information on the mechanical properties of and the effect of load upon dental hard tissue is important in the development of successful dental materials. Existing methods of measuring such properties of tissue are subject to significant experimental error. This study reports on the use of an Ultra-Micro-Indentation System (UMIS) to measure the hardness and elastic modulus of primary enamel and dentine.OBJECTIVEBaseline information on the mechanical properties of and the effect of load upon dental hard tissue is important in the development of successful dental materials. Existing methods of measuring such properties of tissue are subject to significant experimental error. This study reports on the use of an Ultra-Micro-Indentation System (UMIS) to measure the hardness and elastic modulus of primary enamel and dentine.Primary molar teeth were sectioned, set in resin and polished. Thirty indentations were made in enamel and dentine using a Berkovitch indentor, 15 of which were subject to a load of 50mN and 15 to a load of 150mN. An automated computerised system converted the force/penetration graph for each indentation in to a hardness vs depth graph from which values for the mean hardness and elastic modulus were calculated.METHODSPrimary molar teeth were sectioned, set in resin and polished. Thirty indentations were made in enamel and dentine using a Berkovitch indentor, 15 of which were subject to a load of 50mN and 15 to a load of 150mN. An automated computerised system converted the force/penetration graph for each indentation in to a hardness vs depth graph from which values for the mean hardness and elastic modulus were calculated.Primary enamel had a mean hardness of 4.88+/-0.35GPa whilst the hardness of dentine was 0.92+/-0.11GPa The elastic modulus for enamel was 80.35+/-7.71GPa and that of dentine 19.89+/-1.92GPa. Using linear regression analysis a significant relationship could be shown between the hardness and the elastic modulus for both enamel and dentine when loaded to 150mN but only for dentine at 50mN (P<0.05). In general the elasticity of tooth structure increased as the hardness increased.RESULTSPrimary enamel had a mean hardness of 4.88+/-0.35GPa whilst the hardness of dentine was 0.92+/-0.11GPa The elastic modulus for enamel was 80.35+/-7.71GPa and that of dentine 19.89+/-1.92GPa. Using linear regression analysis a significant relationship could be shown between the hardness and the elastic modulus for both enamel and dentine when loaded to 150mN but only for dentine at 50mN (P<0.05). In general the elasticity of tooth structure increased as the hardness increased.The UMIS offers a simple and reproducible method of measuring basic mechanical properties of small samples of enamel and dentine.CONCLUSIONThe UMIS offers a simple and reproducible method of measuring basic mechanical properties of small samples of enamel and dentine. Baseline information on the mechanical properties of and the effect of load upon dental hard tissue is important in the development of successful dental materials. Existing methods of measuring such properties of tissue are subject to significant experimental error. This study reports on the use of an Ultra-Micro-Indentation System (UMIS) to measure the hardness and elastic modulus of primary enamel and dentine. Primary molar teeth were sectioned, set in resin and polished. Thirty indentations were made in enamel and dentine using a Berkovitch indentor, 15 of which were subject to a load of 50mN and 15 to a load of 150mN. An automated computerised system converted the force/penetration graph for each indentation in to a hardness vs depth graph from which values for the mean hardness and elastic modulus were calculated. Primary enamel had a mean hardness of 4.88+/-0.35GPa whilst the hardness of dentine was 0.92+/-0.11GPa The elastic modulus for enamel was 80.35+/-7.71GPa and that of dentine 19.89+/-1.92GPa. Using linear regression analysis a significant relationship could be shown between the hardness and the elastic modulus for both enamel and dentine when loaded to 150mN but only for dentine at 50mN (P<0.05). In general the elasticity of tooth structure increased as the hardness increased. The UMIS offers a simple and reproducible method of measuring basic mechanical properties of small samples of enamel and dentine. Objective: Baseline information on the mechanical properties of and the effect of load upon dental hard tissue is important in the development of successful dental materials. Existing methods of measuring such properties of tissue are subject to significant experimental error. This study reports on the use of an Ultra-Micro-Indentation System (UMIS) to measure the hardness and elastic modulus of primary enamel and dentine. Methods: Primary molar teeth were sectioned, set in resin and polished. Thirty indentations were made in enamel and dentine using a Berkovitch indentor, 15 of which were subject to a load of 50 mN and 15 to a load of 150 mN. An automated computerised system converted the force/penetration graph for each indentation in to a hardness vs depth graph from which values for the mean hardness and elastic modulus were calculated. Results: Primary enamel had a mean hardness of 4.88±0.35 GPa whilst the hardness of dentine was 0.92±0.11 GPa The elastic modulus for enamel was 80.35±7.71 GPa and that of dentine 19.89±1.92 GPa . Using linear regression analysis a significant relationship could be shown between the hardness and the elastic modulus for both enamel and dentine when loaded to 150 mN but only for dentine at 50 mN ( P<0.05). In general the elasticity of tooth structure increased as the hardness increased. Conclusion: The UMIS offers a simple and reproducible method of measuring basic mechanical properties of small samples of enamel and dentine. |
| Author | Swain, M Kilpatrick, N Mahoney, E Holt, A |
| Author_xml | – sequence: 1 givenname: E surname: Mahoney fullname: Mahoney, E organization: Department of Paediatric Dentistry, Westmead Centre of Oral Health, Westmead 2145, NSW, Australia – sequence: 2 givenname: A surname: Holt fullname: Holt, A organization: Biomaterials Research Unit, Faculty of Dentistry, The University of Sydney, Suite G11, National Innovation Centre, Australian Technology Park, Eveleigh 1430, NSW, Australia – sequence: 3 givenname: M surname: Swain fullname: Swain, M organization: Biomaterials Research Unit, Faculty of Dentistry, The University of Sydney, Suite G11, National Innovation Centre, Australian Technology Park, Eveleigh 1430, NSW, Australia – sequence: 4 givenname: N surname: Kilpatrick fullname: Kilpatrick, N email: nicky@bassdata.com.au organization: Department of Dentistry, Royal Children's Hospital, Flemington Road, Parkville, Vic. 3052, Australia |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/11082528$$D View this record in MEDLINE/PubMed |
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| Snippet | Objective: Baseline information on the mechanical properties of and the effect of load upon dental hard tissue is important in the development of successful... Baseline information on the mechanical properties of and the effect of load upon dental hard tissue is important in the development of successful dental... |
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| SubjectTerms | Berkovitch indentor Child, Preschool Dental Enamel - chemistry Dental Stress Analysis - instrumentation Dental Stress Analysis - methods Dentin - chemistry Elasticity Hardness Hardness Tests Humans Linear Models Molar - chemistry Primary molar teeth Reproducibility of Results Signal Processing, Computer-Assisted Tooth, Deciduous - chemistry Ultra-micro-indentation system |
| Title | The hardness and modulus of elasticity of primary molar teeth:an ultra-micro-indentation study |
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