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Minerva Dental and Oral Science 2021 August;70(4):147-54

DOI: 10.23736/S2724-6329.20.04354-X


lingua: Inglese

Effect of photo-polymerization mode on the degree of conversion of resin cement under different ceramic materials

Kamal EBEID 1 , Ahmed SABET 1, 2, Nancy RAFLA 1, Nadin AL-HAJ HUSAIN 3, Mutlu ÖZCAN 4

1 Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt; 2 Department of Fixed Prosthodontics, British University, Cairo, Egypt; 3 School of Dental Medicine, Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland; 4 Division of Dental Biomaterials, Center for Dental and Oral Medicine, Clinic for Reconstructive Dentistry, University of Zurich, Zurich, Switzerland

BACKGROUND: This study evaluated the effect of different polymerization modes and duration on the degree of conversion (DC) of resin cement under different types of ceramics.
METHODS: Ceramic materials were divided into 3 groups (N.=60): group 1, Cerasmart; group 2, Vita Enamic; and group 3, Vita Mark II. Each group was then divided into three subgroups (N.=20) according to the polymerization mode (A: low-intensity; B: high-intensity; and C: soft-start). Subgroups were then divided into two further groups according to the polymerization time (I: 10 s; and II: 20 s). DC of light-cured resin cement beneath different kinds of ceramics was tested using FTIR spectroscopy. Results were compared to a control group cured without overlying ceramic.
RESULTS: While the type of ceramic and mode of polymerization showed a significant effect on the DC of resin cement, polymerization duration did not. Vita Mark II group showed the highest DC of resin cement followed by Vita Enamic and Cerasmart. High- and low-intensity polymerization modes did not show significant difference, but both showed significantly lower DC when compared to soft start mode.
CONCLUSIONS: Type of ceramic and polymerization mode showed a direct effect on the DC of resin cement.

KEY WORDS: Ceramics; Resin cements; Polymers

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