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Journal of Dental Research
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A Metal Halide Light Source for Laboratory Curing of Prosthetic Composite Materials

H. Matsumura

Department of Fixed Prosthodontics, Nagasaki University School of Dentistry, 1-7-1, Sakamoto, Nagasaki 852, Japan

N. Tanoue

Department of Fixed Prosthodontics, Nagasaki University School of Dentistry, 1-7-1, Sakamoto, Nagasaki 852, Japan

M. Atsuta

Department of Fixed Prosthodontics, Nagasaki University School of Dentistry, 1-7-1, Sakamoto, Nagasaki 852, Japan

S. Kitazawa

Toho Dental Products Co., Ltd., 2-10-2, Uchiya, Urawa 336, Japan

A high-intensity laboratory photo-curing unit has been developed with the aim of improving the post-curing properties of composite veneering materials. This study introduces the structure of the curing unit and examines the resulting properties of a representative composite material. The curing unit is equipped with two metal halide lamps that radiate both ultraviolet and visible light. Unlike conventional metal halide lamps for industrial use, these metal halide lamps radiate an increased intensity of visible radiation. Properties of a microfilled composite veneering material cured with the new metal halide unit were ascertained. A xenon photo-curing unit was also used as a control. The specimens cured with the metal halide unit exhibited greater Knoop hardness numbers and flexural moduli as compared with those cured with the xenon unit, and also showed reduced water solubility values. These results suggest that the metal halide light source is effective in curing composite materials within a shorter period of time and with improved conversion.

Key Words: photo-curing unit • light source • composite veneer.

Journal of Dental Research, Vol. 76, No. 2, 688-693 (1997)
DOI: 10.1177/00220345970760021001
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