Date of Award

2015

Document Type

Thesis

Degree Name

Bachelor of Science (B.S.) in Biochemistry and University Honors

Department

Chemistry

First Advisor

Jack Ferracane

Subjects

Dental resins -- Spectra, Dental resins -- Analysis, Gums and resins, Synthetic -- Curing -- Evaluation

DOI

10.15760/honors.173

Abstract

Objective: To compare the light-transmission and spectral output of a polywave and monowave LCU thru two different composites at varying thicknesses.

Methods: For irradiance measurements two bulk fill composites (n=3) containing different photoinitiators: CQ-based (SonicFill, Kerr) and TPO and CQ-based (Tetric EvoCeram, Ivoclar Vivadent) were prepared in Delrin molds of varying thicknesses (1mm, 2mm, and 3mm). A Resin Calibrator (MARC Resin Calibrator, BlueLight Analytics) was used to determine irradiance and spectrum of two different curing lights as the samples were cured for 20 seconds: a polywave (Bluephase G2, Ivoclar Vivadent) and a monowave (SmartLite Focus, DENTSPLY) LCUs.

Results: The polywave LCU had two peaks at about 407nm (violet) and at 455.58nm (blue) and the monowave had one peak at 473.04nm (blue). For both LCUs, the TPO- and CQ-based composite had a higher percentage of irradiance transmitted thru all three thicknesses when compared to the CQ-based composite. When comparing curing lights the monowave had a higher percent transmittance thru both of the composites compared to the polywave unit.

Persistent Identifier

http://archives.pdx.edu/ds/psu/15560

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