Porcelain veneer bonding to dentin and the curing performance of plasma-arc light with respect to porcelain thickness.
Plasma and halogen lamp units were used to photo-cure a composite resin for porcelain bonding. Mean shear bond strengths to dentin after light curing through porcelain of 1 and 2 mm thickness ranged from 20 to 27 MPa before and after thermocycling, indicating no significant effects due to porcelain thickness, curing method, or thermocycling, except for plasma curing for 3 s through porcelain of 2 mm thickness that overcame thermocycling. The mean bond strength in this group was significantly lower than both that before thermocycling and that of the porcelain of 1 mm thickness. Knoop hardness values for plasma curing for 3 s through porcelain of 2 mm thickness were significantly lower than the others. These results suggest that plasma light for 3 s is not sufficient to cure composite resin cement through porcelain of 2 mm thickness.
Okamoto
Mitsuharu
M
Department of Oral and Maxillofacial Rehabilitation, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama 700-8525, Japan.
Mine
Atsushi
A
Watanabe
Kazumi
K
Kawahara
Daizo
D
Yatani
Hirofumi
H
D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects; D001840:Dental Bonding; D003776:Dental Porcelain / Q000737:chemistry* / Q000528:radiation effects; D019232:Dental Restoration Failure; D003801:Dental Veneers; D003804:Dentin / Q000648:ultrastructure*; D006244:Hardness; D008027:Light; D008422:Materials Testing; D044367:Phase Transition; D019279:Resin Cements / Q000737:chemistry* / Q000528:radiation effects; D013314:Stress, Mechanical; D013499:Surface Properties; D013816:Thermodynamics; D013997:Time Factors
D003188:Composite Resins; D019279:Resin Cements; D003776:Dental Porcelain