What is it about?
The aim of this study was to develop a new method to evaluate the consistency of resin cements by modeling the operation of setting a crown. First, the weight of the resin cements and the inner surface area of the crown were measured to configure the conditions for consistency evaluation using a model abutment tooth and a model crown. As the evaluation method, a 200 mm² contact surface area of a glass plate was placed on top of 30.0 mg of resin cement paste, and a pressure of 10.0 N was applied to the glass plate. When the paste was spread over the entire bottom surface of the glass plate, it was designated a “Pass”. A “Pass” result was obtained for all resin cements tested and a “Fail” result for all resin composites, indicating the usefulness of the new method for assessing cement flowability when setting a crown.
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Why is it important?
The new method to evaluate consistency developed in this study gave a “Pass” result for all resin cements and a “Fail” result for the resin composite. This indicates that the developed method can be used to determine whether a resin cement has appropriate flowability for setting a crown.
Perspectives
This study proposed a new test method to evaluate the consistency of resin cements. We consider that it is preferable to increase the number of commercially available product tests to verify the usefulness of this consistency evaluation method. In addition, the clinical handling properties of the resin cement should not be determined by this method alone, but should be comprehensively evaluated in combination with the results of other tests such as film thickness and curing time. The results of this study indicate that the consistency evaluation method using this model has potential as a method to determine whether a resin cement to be tested has appropriate flowability for the setting of prosthetic appliances.
Dr Satoshi Yamaguchi
Osaka University Graduate School of Dentistry
Read the Original
This page is a summary of: Development of novel measurement method for consistency of resin cements, Dental Materials Journal, January 2021, Japanese Society for Dental Materials and Devices,
DOI: 10.4012/dmj.2020-396.
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