7 research outputs found
Microtensile bond strength of three different veneering porcelain systems to a zirconia core for all ceramic restorations.
No full textPURPOSE:
This study investigated the microtensile bond strength of three different ceramic veneering systems to one type of zirconia substrate.
METHODS:
Bilayered zirconia veneer discs were fabricated of a LAVA zirconia core and three different veneering ceramics (VITA VM9, Lava Ceram, Creation ZI) using a conventional layering technique. Discs were cut into microbars of 6 mm x 1 mm x 1 mm. Microtensile bond strength between veneer and core was measured. Surfaces of fractured specimens were examined with scanning electron microscopy (SEM).
RESULTS:
The mean microtensile bond strengths were respectively VITA VM9 23.52 MPa (8.33), Creation ZI 18.35 MPa (6.40), and Lava Ceram 14.76 MPa (4.00). The differences were statistically significant. Failures were mainly interfacial in all tested group
Influence of four different cements on the colour of Zirconia structures of varying ceramic thickness.
No full textInfluence of surface pretreatment on the short term bond strength of composite resin to a zirconia-based material. A microtensile bond strength test.
No full textSpectrophotometric evaluation of color match to VITA classical shade guide of four different veneering porcelain systems for metal ceramic restorations.
No full textPURPOSE:
To determine by a spectrophotometric analysis the variations in color between the fabricated shade of four different porcelain systems and the intended shade when applied in a set thickness.
METHODS:
Four porcelain systems (Duceram Kiss, VITA Omega, Wieland Reflex, Ivoclar IPS d.SIGN) for metal ceramic restorations were selected. Three disk-shaped (15 mm diameter, 0.3 mm thickness) specimens per group were made for three different shades of the A color scale of the Vitapan classical shade guide. On a Cr-Co alloy, 0.15 mm of porcelain opaque and 1.0 mm of translucent porcelain was applied. The porcelain stratification was executed according to the manufacturers' indications. The color measures were made by the clinical spectrophotometer Easyshade.
RESULTS:
No statistically significant differences were found among the ceramic systems examined. The recorded differences in color between A2 porcelain disks and corresponding VITA shade tabs were closer (mean delta E = 2.50) than those recorded for shade A3 (mean delta E = 3.84) and shade A3.5 (mean delta E= 3.94) (P<0.05)
