Porcelain-composite interface microleakage with various porcelain surface treatments.
This study evaluated the effects of various porcelain surface treatments on the microleakage of the porcelain-composite interface. The experimental model isolated and evaluated only the porcelain-composite interface without the presence of a bond to tooth structure. Four types of porcelain were fired into circular porcelain tabs 1.0 mm thick by 8.5 mm in diameter. The groups of porcelain were divided into subgroups for treatment with hydrofluoric acid-etching and silane. A jig standardizing composite thickness to 0.2 mm was used to photopolymerize composite to porcelain. The margins were finished and polished with burs and disks. Samples were stored in 37 degrees C water thermocycled 1000X, placed in AgNO3 solution, embedded in epoxy, and cross-sectioned every 90 degrees for measurement of stain penetration at the composite-porcelain interface. Occasional crazing of porcelain from composite polymerization shrinkage was observed. Porcelain surface treatment significantly increased the specimens' ability to withstand water storage and thermal-cycling procedures. Porcelain surface treatment with silane alone did not reduce microleakage, but, in combination with etching, reduced microleakage significantly.
Sorensen
J A
JA
School of Dentistry, University of California, Los Angeles.
Kang
S K
SK
Avera
S P
SP
D000134:Acid Etching, Dental; D000704:Analysis of Variance; D016009:Chi-Square Distribution; D001840:Dental Bonding; D003763:Dental Leakage; D003776:Dental Porcelain; D006858:Hydrofluoric Acid; D012821:Silanes; D013194:Staining and Labeling; D013499:Surface Properties; D016019:Survival Analysis; D013718:Tensile Strength
D012821:Silanes; D003776:Dental Porcelain; D006858:Hydrofluoric Acid