Spectrophotometric evaluation of color match of three different porcelain systems for all-ceramic zirconia-based restorations.

Purpose: To determine by a spectrophotometric analysis the variations in color between the intended and the fabricated shades of three different porcelain systems when applied in a standardized thickness on a zirconia core.

Methods: Three porcelain systems for zirconia based restorations, Ivoclar IPS e.max Ceram, VITA VM9, and Creation Zi-F were tested.

Influence of surface pretreatment on the short-term bond strength of resin composite to a zirconia-based material.

Purpose: To evaluate the influence of airborne-particle abrasion of zirconia before and after sintering, on the bond strength between a zirconia core and an indirect resin composite material.

Methods: 9 disks of Y-TZP zirconia core were prepared and divided into three equal groups. In Group 1 pre-sintered Y-TZP zirconia was airborne-particle abraded with 120 microm alumina oxide.

Three-dimensional finite element analysis of different implant configurations for a mandibular fixed prosthesis.

Purpose: The distribution of stresses in bone, implants, and prosthesis were analyzed via three-dimensional finite element modeling in different implant configurations for a fixed implant-supported prosthesis in an edentulous mandible.

Materials And Methods: A finite element model was created with data obtained from computed tomographic scans of a human mandible. Anisotropic characteristics for cortical and cancellous bone were incorporated into the model.

Microtensile bond strength of three different veneering porcelain systems to a zirconia core for all ceramic restorations.

Purpose: 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.

Resistance to wear of four matrices with ball attachments for implant overdentures: a fatigue study.

Purpose: The study evaluated in vitro the retention force and the wear resistance over simulated function of four matrix components of ball attachments for implant-retained overdentures.

Materials And Methods: Four types of matrices for ball attachments were evaluated in a fatigue study simulating 5500 cycles of insertion and removal. The matrices used were (1) a Teflon matrix supported by a metal housing, (2) a titanium matrix, (3) a gold alloy matrix, (4) an O-ring matrix using the red color ring for medium retention.

Spectrophotometric evaluation of color match to VITA classical shade guide of four different veneering porcelain systems for metal ceramic restorations.

Purpose: 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.

Immediate loading of two implants supporting a ball attachment-retained mandibular overdenture: a prospective clinical study.

Background: A prospective clinical study was conducted to evaluate clinically and radiographically the performance of two implants immediately loaded supporting a ball attachment-retained mandibular overdenture.

Materials And Methods: Seventeen completely edentulous patients were included in the study. Each patient received two implants inserted after a minimal flap reflection and no vestibular extension in order to reduce the postoperative swelling and facilitate immediate prosthesis connection.