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ndltd-OhioLink-oai-etd.ohiolink.edu-osu12732493132021-08-03T05:59:14Z Effect of cooling rate and thermal expansion mismatch on the apparent interfacial toughness of core-veneer lithium-disilicate dental ceramics Satoris, Brock Alan <p>With sustained interest in esthetic dental restorations, research in all-ceramic technology has led to continued development and improvement. However, the nature of the adherence between a core ceramic and its veneer has proven difficult to measure through traditional methods. Indentation techniques have been proposed to qualitatively evaluate the coating adhesion and apparent interfacial toughness between brittle bilayers. The purpose of the present study is to evaluate the effectiveness of a Vickers indentation technique to assess apparent interfacial toughness of core-veneer dental ceramic bilayers subjected to various cooling rates and exhibiting various thermal expansion mismatches.</p><p>A core material of lithium disilicate-based pressable ceramic was veneered with experimental ceramic of high, low or matched coefficient of thermal expansion. The High, Low and Matched groups were sorted into 3 subgroups and subjected to fast, medium or slow cooling rates. Vickers indentation along the interface was conducted to induce interface cracking for each group (<i>n</i>=30). The mean apparent interfacial toughness was then calculated and analyzed statistically with one-way ANOVA and regression analysis.</p><p>The apparent interfacial toughness values ranged from 1.21-1.70 MPa·m<sup>05</sup>. Apparent interfacial toughness was affected by both cooling rate and coefficient of thermal expansion mismatch. A Fast cooling rate led to significantly higher apparent interfacial toughness than Medium or Slow cooling rates. A Matched CTE led to increased apparent interfacial toughness, while a High CTE mismatch led to significantly lowered toughness. The Fast cooled-Matched CTE group was significantly higher than the other groups (p ≤0.001), except for the Fast cooled-Low CTE group (p=0.355). However, the cooling rate had a greater effect on the apparent interfacial toughness than thermal expansion mismatch.</p><p>This Vickers indentation test was an effective method for determining statistically significant differences in apparent interfacial toughness values of bilayered dental ceramics.</p> 2004 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1273249313 http://rave.ohiolink.edu/etdc/view?acc_num=osu1273249313 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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English
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NDLTD
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| author |
Satoris, Brock Alan
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Satoris, Brock Alan
Effect of cooling rate and thermal expansion mismatch on the apparent interfacial toughness of core-veneer lithium-disilicate dental ceramics
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Satoris, Brock Alan
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| author_sort |
Satoris, Brock Alan
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| title |
Effect of cooling rate and thermal expansion mismatch on the apparent interfacial toughness of core-veneer lithium-disilicate dental ceramics
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| title_short |
Effect of cooling rate and thermal expansion mismatch on the apparent interfacial toughness of core-veneer lithium-disilicate dental ceramics
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| title_full |
Effect of cooling rate and thermal expansion mismatch on the apparent interfacial toughness of core-veneer lithium-disilicate dental ceramics
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| title_fullStr |
Effect of cooling rate and thermal expansion mismatch on the apparent interfacial toughness of core-veneer lithium-disilicate dental ceramics
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| title_full_unstemmed |
Effect of cooling rate and thermal expansion mismatch on the apparent interfacial toughness of core-veneer lithium-disilicate dental ceramics
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| title_sort |
effect of cooling rate and thermal expansion mismatch on the apparent interfacial toughness of core-veneer lithium-disilicate dental ceramics
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The Ohio State University / OhioLINK
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2004
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| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1273249313
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| work_keys_str_mv |
AT satorisbrockalan effectofcoolingrateandthermalexpansionmismatchontheapparentinterfacialtoughnessofcoreveneerlithiumdisilicatedentalceramics
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| _version_ |
1719428978861670400
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