Abstract
The aim of this study was to evaluate the depth of cure and Knoop hardness in the P60 composite resin photo-activated using different methods. A bipartite brass matrix (3 mm in diameter X 11 mm in height) was filled with the composite and photo-activation was performed using continuous light, exponential light, intermittent light, plasma arc curing (PAC) or light-emitting diodes (LED). After opening the matrix, the uncured material was removed with a steel spatula and the polymerized composite was measured using a pachymeter. The specimens were then included in self-curing acrylic resin and worn longitudinally and the hardness was measured on the surface and at depths of 1, 2, 3, 4 and 5 mm. The data were analyzed by ANOVA and Tukey's test (5%). The results showed that the depth of cure was higher with the intermittent light, followed by continuous light, exponential light, PAC and LED methods. Up to a depth of 2 mm, all methods revealed similar hardness values, but there were differences between them at other depths, at which LED demonstrated the lowest values followed by PAC.
Highlights
The light-activated composite resins, brought into practice in the 1970’s, introduced expressive changes that made their satisfactory application in posterior teeth possible
Photoactivation was performed with a) continuous light, b) exponential light, c) intermittent light, d) plasma arc curing (PAC), or e) light-emitting diodes (LED)
The results of the depth of cure and the Knoop hardness are presented in Tables 2 and 3, respectively
Summary
The light-activated composite resins, brought into practice in the 1970’s, introduced expressive changes that made their satisfactory application in posterior teeth possible Characteristics such as composition, light intensity and exposure time can modify the final properties of the material and, restrict the clinical applications. Since the introduction of this method, other photo-activation methods have been suggested including intermittent light [9,10], plasma arc curing (PAC) [11] and, more recently, a new technology employing light-emitting diodes (LED) [12,13] These innovative techniques require further investigation before they can be effectively applied in dental practice
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
