ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00655.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Marginal leakage in amalgam restorations often precedes the development of secondary caries. One potential way to improve the marginal seal of such restorations, and thus minimize the risk of carles development, is to apply a glassionomer base prior to amalgam placement.This study compared microleakage resistance among amalgam restorations placed with and without light‐cured glass‐ionomer base materials. Preparations were made in extracted human molar teeth. Four groups were studied, including copal varnish, which was used as a control. All specimens were restored with amalgam. Results indicated significantly greater leakage at the cavity wall/base interface for restorations with a copal varnish cavity liner than for those with a glass‐ionomer base. Leakage differences among bases were also found at the amalgam/base interface. Best results were obtained with a dual‐cure resin‐based system. These samples showed minimal leakage at both the cavity wall/base and the base/amalgam interfaces. These findings suggest that light‐cured glass‐ionomer bases can be effective in the prevention of microleakage in amalgam

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00656.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The purpose of thisin vitrostudy was to determine whether adhesive lining materials reduce microleakage in amalgam restorations, and to observe the degree of microleakage at the interface between freshly placed (new) and existing (old) amalgam. Forty‐eight specimens were used in the experimental groups. The materials used to study microleakage in this investigation were: copal varnish, a dentin bonding agent (Clearfil New Bond), and a 4‐META adhesive (Amalgambond). No significant difference in microleakage was found at the interfaces between freshly placed and existing amalgam. Significantly less microleakage was noted in specimens using the 4‐META adhesive and the dentin bonding agent as compared to specimens in which no lining material was placed. Significantly less microleakage was noted in specimens using the 4‐META adhesive compared to specimens using cavity

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00657.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The purpose of this study was to compare the shear and flexural strength obtained when various adhesives or liners were used to bond freshly placed amalgam to existing amalgam. The adhesives used in this study were the following: cavity varnish, 4‐META adhesive (Amalgambond), and a dentin bonding agent (Clearfil New Bond). After samples were fabricated, shear bond strengths were determined by using an Instron Testing Machine, and flexural strengths determined using a Material Test System (MTS) testing machine. All test groups produced shear and flexural strengths less than one half of the control group. The dentin bonding agent and the 4‐META adhesive produced significantly higher shear and flexural strengths than the test group in which no lining material was u

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00658.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The purpose of this study was to observe the interfaces between (1) dentin and amalgam and (2) freshly placed amalgam and existing amalgam using various adhesive liners. Specimens were randomly assigned to four equal groups for liner placement: Group I ‐ control, no liner used; Group II ‐ copal varnish; Group III ‐4‐META adhesive; Group IV ‐ dentin bonding agent. After liner placement and amalgam replacement, specimens set for 24 hours and were then thermocycled in 0.5% basic Fuchsin dye, sectioned, and SEM analyses performed. Microgaps appeared in a disjointed fashion at the interface between freshly placed and existing amalgam. The 4‐META adhesive appeared to establish a bond between amalgam and tooth structure and, thus, diminished the microgap between amalgam

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00659.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Although silver amalgam is a strong, stable, technique‐insensitive material, its use requires the removal of more intact tooth structure than adhesive materials in order to provide long‐term retention. Thus remaining tooth structure is weakened rather than strengthened. Bonded silver amalgam restorations, on the other hand, have excellent retention, don't require pins, strengthen remaining tooth structure, eliminate the likelihood of cuspal fracture, and eliminate postoperative sensitiv

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00660.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Recently, it has been erroneously reported that adhesive bonds to various substrates produced with 4‐META/MMA‐TBB type resins degrade by hydrolysis. This paper dispels this myth. The author cites a number of independent research studies indicating that bonds mediated by 4‐META/MMA‐TBB systems are extremely stable when subjected to extensive thermocycling in a wet envi

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00661.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The properties of a new, dispersed‐phase amalgam containing admixed indium (Indisperse) are reviewed. Laboratory tests show that the addition of indium significantly improves the strength and the resistance to creep and corrosion of the amalgam, and that mercury release from the amalgam is markedly reduced. A 5‐year clinical study shows a lower frequency for marginal breakdown for Indisperse compared to other dispersed‐phase amalgam containing no admixed i

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00662.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1992.tb00663.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY