Curing characteristics of a composite - Part 1: Cure depth relationship to conversion, hardness and radiant exposure

Robert L. Erickson, Wayne W. Barkmeier, Rolf H. Halvorson

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Abstract

Objective As the first part of a larger study on curing characteristics of a resin-based composite (RBC), the major objectives were to create an energy-hardness relationship (EHR) that relates Knoop hardness (KHN) with radiant exposure (H), and to do the same for degree of conversion (DC) in the form of an energy-conversion relationship (ECR). Both of these are meant to be universal relationships that satisfy reciprocity between irradiance and time for a given H value. Methods RBC specimens were made by curing the material in 6 mm diameter, stainless steel molds for 10-40 s and allowing the material to cure for 24 h. Cure depths were determined by a scrape-back method. KHN and DC values were determined along the central axis of the specimens, and these values were related to the internal H values using a measured transmission relationship, T(d), for the RBC. Results Suitable EHR and ECR relationships were developed for the RBC material that can be used to describe the curing characteristics under various curing conditions. However, predictive accuracy is affected for incident radiant exposures below about 12 J/cm2 to some extent. A relationship between KHN and DC was established. Significance For the RBC examined, KHN measurements can be used as an alternate method or in conjunction with DC for describing the curing characteristics.

Original languageEnglish (US)
Pages (from-to)e125-e133
JournalDental Materials
Volume30
Issue number6
DOIs
StatePublished - Jun 2014

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials

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