Progression of osteogenic cell cultures grown on microtopographic titanium coated with calcium phosphate and functionalized with a type I collagen-derived peptide.

Background: The functionalization of metallic surfaces aims at promoting the cellular response at the biomaterial-tissue interface. This study investigates the effects of the functionalization of titanium (Ti) microtopography with a calcium phosphate (CaP) coating with and without peptide 15 (P-15), a synthetic peptide analog of the cell-binding domain of collagen I, on the in vitro progression of osteogenic cells.

Methods: Sandblasting and acid etching (SBAE; control) Ti microtopography was coated with CaP, enabling the loading of two concentrations of P-15: 20 or 200 μg/mL.

Assessment of flexural strength and color alteration of heat-polymerized acrylic resins after simulated use of denture cleansers.

The purpose of this study was to assess flexural strength and color alteration of acrylic resins immersed in denture cleansers for different periods of time. Rectangular specimens (65 x 10 x 3mm) made from three heat-polymerized acrylic resins (Lucitone 550, QC-20 and Triplex) were assigned to three denture cleansers groups (Bony Plus, Corega Tabs and Efferdent Plus) and a control group (immersion in water). Soaking trials of 15 min and 8 h simulated 30 days of use.

Evaluation of transfer impressions for osseointegrated implants at various angulations.

The accuracy of impressions that transfer the relationship of the implant to the metal framework of the prosthesis continues to be a problem. This study was designed to evaluate the accuracy of the transfer process under variable conditions with regard to implant analog angulations, impression materials, and techniques. Replicas (n = 60) of a metal matrix (control) containing four implants at 90 degrees , 80 degrees , 75 degrees , and 65 degrees in relation to the horizontal surface were obtained by using three impression techniques: T1-indirect technique with conical copings in closed trays; T2-direct technique with square copings in open trays; and T3-square copings splinted with autopolymerizing acrylic resin; and four elastomers: "P"-polysulfide; "I"-polyether; "A"-addition silicone; and "Z"-condensation silicone.

Effect of casting technique on surface roughness and consequent mass loss after polishing of NiCr and CoCr base metal alloys: a comparative study with titanium.

Statement Of Problem: Surface roughness of cast metal frameworks may lead to difficulties in finishing or polishing procedures and weaken the framework.

Purpose: The aim of this study was to assess the surface roughness of 2 base metal alloys, submitted to different casting techniques, to determine the influence of surface roughness on loss of mass after polishing compared to commercially pure titanium castings.

Material And Methods: Forty disk-shaped wax patterns (8 x 2 mm) were randomly assigned to 5 groups (n=8): (1) CoCr alloy (Wironit), acetylene-oxygen flame casting (WFC), (2) NiCr alloy (Verabond II), acetylene-oxygen flame casting (VFC), (3) CoCr alloy, vacuum casting (WVC), (4) NiCr alloy, vacuum casting (VVC), and (5) commercially pure Ti alloy (Ti) melted by electric arc in argon gas atmosphere.

[Analysis of the point-counting and planimetric methods in the quantification of denture biofilm--a methodological validation study].

Two methods of quantification of the biofilm (point-counting and planimetric) were tested and compared with the paper-weighing method and with the Prosthesis Hygiene Index. The internal surfaces of 62 complete dentures were stained and photographed. The slides were projected on a paper sheet.