Evaluation of microleakage in vitro of conventional and modified Class III restorations with and without the use of an intemediary bonding agent
Date
1980
DOI
Authors
Ashayeri, Nargess
Version
OA Version
Citation
Abstract
The use of composite resins in dentistry has become a widely accepted modality of treatment. Composite resins are presently being used in Class III, IV and V cavity preparations and sometimes, whenever esthetics is demanding, in Class II cavities. These restorations are usually inserted into cavities that are prepared according to the basic guidelines established by Black around the turn of the century. Even though these composite resins are an improvement over unfilled resins and silicate cements, they still suffer from marginal leakage, amongst other shortcomings. Over a period of time, which differs from patient to patient, the restoration may exhibit a darkening and discoloration at the margins. Recently some investigators have recommended the use of an intermediary bonding agent to act as a seal between composite resin and cavity wall. The basic principle of this treatment is as follows. The cavity preparation is treated with a conditioner (usually 50% phosphoric acid) following which an unfilled resin of the BIS-GMA type is applied. The resin is of a low viscosity and bonds to the conditioned enamel. The composite resin which is then inserted will chemically bond to the intermediary resin. Thus an effective seal has been accomplished. It was felt by many investigators that this type of approach, purely based on adhesion, did not require the standardized cavity preparation. Multiple variations were attempted, which is the reason of this project.
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Description
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Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry (Prosthodontics), 1980.
Bibliography: leaves 70-80.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry (Prosthodontics), 1980.
Bibliography: leaves 70-80.
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This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.