東華大學圖書館 |

Stability of dentin bonding systems.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Stability of dentin bonding systems./
作者:	Lee, Sheng-Yang.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1994,
面頁冊數:	327 p.
附註:	Source: Dissertations Abstracts International, Volume: 56-06, Section: B.
Contained By:	Dissertations Abstracts International56-06B.
標題:	Materials science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9433882
ISBN:	9798208262627

Stability of dentin bonding systems.
Lee, Sheng-Yang.

Stability of dentin bonding systems. - Ann Arbor : ProQuest Dissertations & Theses, 1994 - 327 p.

Source: Dissertations Abstracts International, Volume: 56-06, Section: B.

Thesis (Ph.D.)--Northwestern University, 1994.

This item must not be sold to any third party vendors.

The increased use in dentistry of dentin bonding systems creates a need to understand the behavior of multi-material and multi-layer systems under conditions which simulate the weathering that occurs in the oral cavity. The experimental conditions chosen were up to 30 days immersion in a recommended food simulating fluid (75% ethanol solution) and in an artificial saliva (Moi-Stir) at 37$\\sp\\circ$C. Their effects on different material components and on a substrate (i.e., composite, bonding agent, dentin, or the whole system) were evaluated. Three distinct, representative commercial adhesive/composite systems (Tenure/Marathon One, Scotchbond Multi-purpose/Z100, and Optibond/Herculite) were examined. After experimental techniques were optimized for curing light excitation energy effects on the shear bond strength (SBS), the diametral tensile strength (DTS), and the compressive strength (CS) of the materials, the weathering effects were measured by SBS, DTS, SEM, and FTIR of exposed or fractured surfaces and by FTIR of leached resin components. These ethanol weathering results were compared to those from a novel laser acoustic emission thermal technique (LAETT) of the composites and model 50/50 wt% Bis-GMA/TEGDMA light-cured resins (either unfilled or 75 wt% filled with silanated glass). The 75% ethanol solution can initiate and sustain polymer degradation and diffusion-controlled behavior. Moi-Stir storage caused degradation of the mechanical properties but not chemical. Ethanol treatment caused the absorbance intensity (AI) of aliphatic C=C (1638.6 cm$\\sp{-1}$) and of O-H ($\\sim$3500 cm$\\sp{-1}$) bonds to significantly decrease while increasing the AI of C=O bonds (1730 cm$\\sp{-1}$). Polymer degradation depended on the composition and chemical structure of the system. The decrease in the number of aliphatic C=C bonds or O-H bonds correlated with an increase in the number of C=O groups. The increase in the number of C=O bonds was a power function of time, t$\\sp{\\rm x}$ (where x was between 0.12 to 0.23). This suggests a complex rate determining process, such as hydroperoxidation or transesterification. The SBS or DTS decrease also correlated with the increase in the AI of the (C=O) bonds. Structural changes in the polymer may explain the strength level changes. Leached resin components were found in the ethanol solution, but not in Moi-Stir, findings which support the suggested chemical changes and reactions. Higher average ethanol diffusivity in unfilled bonding agent (1.2 $\imes$ 10$\\sp{-5}$ cm$\\sp2$ s$\\sp{-1}$) was found than occurred in filled Optibond (0.5 $\imes$ 10$\\sp{-5}$ cm$\\sp2$ s$\\sp{-1}$) or in the more heavily filled composites (1.8 $\imes$ 10$\\sp{-6}$ cm$\\sp2$ s$\\sp{-1)}$. These findings suggest that solution up-take occurred through the resin matrix and that the filler particles may play an important role in weathering resistance to the oral environment. The chemical changes in dentin structure affected by the ethanol solution did not always result in decreased SBS. No denaturing was seen for Moi-Stir conditioned dentin surfaces. However, Moi-Stir pre-conditioned dentins always exhibited significantly reduced SBS. SEM results support the SBS and FTIR results. Changes in the LAETT emission spectra of the model systems relate to fractures in the resin matrix. With respect to initial ethanol damage, LAETT showed a similar type of change after ethanol storage as did SBS and DTS.

ISBN: 9798208262627Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

compression

Stability of dentin bonding systems.
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020 $a 9798208262627
035 $a (MiAaPQ)AAI9433882
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100 1 $a Lee, Sheng-Yang. $3 3680595
245 1 0 $a Stability of dentin bonding systems.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1994
300 $a 327 p.
500 $a Source: Dissertations Abstracts International, Volume: 56-06, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Greener, Evan H.
502 $a Thesis (Ph.D.)--Northwestern University, 1994.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The increased use in dentistry of dentin bonding systems creates a need to understand the behavior of multi-material and multi-layer systems under conditions which simulate the weathering that occurs in the oral cavity. The experimental conditions chosen were up to 30 days immersion in a recommended food simulating fluid (75% ethanol solution) and in an artificial saliva (Moi-Stir) at 37$\\sp\\circ$C. Their effects on different material components and on a substrate (i.e., composite, bonding agent, dentin, or the whole system) were evaluated. Three distinct, representative commercial adhesive/composite systems (Tenure/Marathon One, Scotchbond Multi-purpose/Z100, and Optibond/Herculite) were examined. After experimental techniques were optimized for curing light excitation energy effects on the shear bond strength (SBS), the diametral tensile strength (DTS), and the compressive strength (CS) of the materials, the weathering effects were measured by SBS, DTS, SEM, and FTIR of exposed or fractured surfaces and by FTIR of leached resin components. These ethanol weathering results were compared to those from a novel laser acoustic emission thermal technique (LAETT) of the composites and model 50/50 wt% Bis-GMA/TEGDMA light-cured resins (either unfilled or 75 wt% filled with silanated glass). The 75% ethanol solution can initiate and sustain polymer degradation and diffusion-controlled behavior. Moi-Stir storage caused degradation of the mechanical properties but not chemical. Ethanol treatment caused the absorbance intensity (AI) of aliphatic C=C (1638.6 cm$\\sp{-1}$) and of O-H ($\\sim$3500 cm$\\sp{-1}$) bonds to significantly decrease while increasing the AI of C=O bonds (1730 cm$\\sp{-1}$). Polymer degradation depended on the composition and chemical structure of the system. The decrease in the number of aliphatic C=C bonds or O-H bonds correlated with an increase in the number of C=O groups. The increase in the number of C=O bonds was a power function of time, t$\\sp{\\rm x}$ (where x was between 0.12 to 0.23). This suggests a complex rate determining process, such as hydroperoxidation or transesterification. The SBS or DTS decrease also correlated with the increase in the AI of the (C=O) bonds. Structural changes in the polymer may explain the strength level changes. Leached resin components were found in the ethanol solution, but not in Moi-Stir, findings which support the suggested chemical changes and reactions. Higher average ethanol diffusivity in unfilled bonding agent (1.2 $\imes$ 10$\\sp{-5}$ cm$\\sp2$ s$\\sp{-1}$) was found than occurred in filled Optibond (0.5 $\imes$ 10$\\sp{-5}$ cm$\\sp2$ s$\\sp{-1}$) or in the more heavily filled composites (1.8 $\imes$ 10$\\sp{-6}$ cm$\\sp2$ s$\\sp{-1)}$. These findings suggest that solution up-take occurred through the resin matrix and that the filler particles may play an important role in weathering resistance to the oral environment. The chemical changes in dentin structure affected by the ethanol solution did not always result in decreased SBS. No denaturing was seen for Moi-Stir conditioned dentin surfaces. However, Moi-Stir pre-conditioned dentins always exhibited significantly reduced SBS. SEM results support the SBS and FTIR results. Changes in the LAETT emission spectra of the model systems relate to fractures in the resin matrix. With respect to initial ethanol damage, LAETT showed a similar type of change after ethanol storage as did SBS and DTS.
590 $a School code: 0163.
650 4 $a Materials science. $3 543314
650 4 $a Dental care. $3 3399948
653 $a compression
653 $a tensile strength
653 $a weathering
690 $a 0794
690 $a 0567
710 2 $a Northwestern University. $3 1018161
773 0 $t Dissertations Abstracts International $g 56-06B.
790 $a 0163
791 $a Ph.D.
792 $a 1994
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9433882