Evaluation of marginal adaptation in three-unit frameworks fabricated with conventional and powder-free digital impression techniques.

Purpose: The purpose of this study was to evaluate the marginal misfits of three-unit frameworks fabricated with conventional and digital impressions techniques.

Materials And Methods: Thirty brass canine and second premolar abutment preparations were fabricated by using a computer numerical control machine and were randomly divided into 3 groups (n=10) as follows: conventional impression group (Group Ci), Cerec Omnicam (Group Cdi), and 3shape TRIOS-3 (Group Tdi) digital impression groups. The laser-sintered metal frameworks were designed and fabricated with conventional and digital impressions.

The comparison of the retention of an implant-supported stud attachment locator and straumann ball attachment at different angulations.

Aim: In this study, we investigated the retention of two attachment types, Straumann ball (SB) and Straumann Locator (SL) attachments, on different implant angulations and identified the most appropriate treatment type or attachment system for each angulation.

Materials And Methods: The attachments placed on angulation of 0°-, 10°-, and 20° implants were subjected to 1440 vertical insertion-separation cycles. The retention values of the attachments after 0, 720, and 1440 cycles were measured using the Instron machine.

Efficacy of polishing kits on the surface roughness and color stability of different composite resins.

Objective: Different polishing kits may have different effects on the composite resin surfaces. The aim of this study was to evaluate the surface roughness and color stability of four different composites which was applied different polishing technique.

Materials And Methods: Thirty specimens were made for each composite resin group (nanohybrid, GrandioSo-GS; nanohybrid, Clearfil Majesty Esthetic-CME; hybrid, Valux Plus-VP; micro-hybrid, Ruby Comp-RC; [15 mm in diameter and 2 mm height]), with the different monomer composition and particle size from a total of 120 specimens.

An assessment of shear bond strength between ceramic repair systems and different ceramic infrastructures.

The purpose of this study was to evaluate of shear bond strengths between two ceramic repair systems and different ceramic infrastructure materials. One hundred cylindrical specimens of ceramic infrastructure were fabricated with non precious metal alloy, zirconia, alumina, galvano, and glass ceramic: 20 non precious metal alloy (NP), 20 zirconia (Z), 20 alumina (A), 20 galvano (G), and 20 glass ceramic (GC). Specimens were divided into 2 subgroups.

Fatigue behavior of zirconia-ceramic, galvano-ceramic, and porcelain-fused-to-metal fixed partial dentures.

Purpose: This study evaluated the fatigue behavior of three fixed partial dentures (FPDs) before and after artificial fatigue testing.

Materials And Methods: Sixty, three-unit zirconia-ceramic (ZC), galvano-ceramic (GC), and porcelain-fused-to-metal (PFM) FPDs (N = 20) were fabricated. Ten specimens from each group were exposed to fatigue testing by being thermocycled (5 to 55°C, 10,000 cycles) and loaded (100,000 cycles, 50 N, 0.