The purpose of this study was to evaluate the effect heat treatments on Vickers hardness commercially pure titanium and Ti-6Al-4V castalloys. Six-millimeter-diameter cylindrical specimens were cast in a Rematitan System. Commercially alloy randomly assigned 3 groups (n=10) that received following treatments: control (no treatment); treatment 1 (T1): heating at 750ºC for 2 h; (T2): annealing 955ºC h aging 620ºC h. After treatments, embedded acrylic resin their surface ground polished...

summary Surface roughness is extremely important as it influences micro‐organism accumulation and consequently oral health. The aim of the present study was to evaluate influence mechanical polishing (MP) chemical (CP) on surface four heat‐cured denture base acrylic resins. Twenty sample discs were prepared for each following resins: Clássico (CL), QC 20 (QC), Acron MC (AC) Onda Cryl (ON). first two are boiling cured resins latter microwave cured. After curing deflasking, samples ground...

This study evaluated the effects of axial and oblique occlusal loading on implant-supported partial dentures with different connection systems (external hexagon, internal Morse taper). Upon loading, all presented similar stress values. Stress values increased under loading. distribution changed for some structures. It can be concluded that load increases bone structures prosthetic components. Internal system implants present more favorable patterns than do external implants.

Abstract Purpose: This study investigated the effect of in vitro accelerated aging reproduced with thermocycling on bond strength three commercially available permanent denture soft liners (PermaSoft, Dentuflex, Ufi‐gel) one heat‐polymerized polymethyl methacrylate resin base (QC‐20) by tensile test. Material and Methods: Ten specimens were prepared for control test groups each material a total 60 specimens. All controls stored water (37°C) 24 hours before testing. received 3000 thermal...

Abstract Purpose: This study evaluated the abrasion resistance of acrylic resin to routine dental brushing procedures using different dentifrices after surface had been chemically or mechanically polished. Materials and Methods: Eighty specimens were prepared heat‐polymerizing (HP) autopolymerizing (AP) resin, immediately submitted grinding with abrasive stones disks. The divided into two groups: first group was polished (MP) pumice slurry, second (CP) heated monomer. After polishing, 30,000...

Objective The aim of this study was to evaluate the distribution generated stress around implants and adjacent bone tissue using different implant-retained overdenture designs through photoelastic analysis. Methods Over an edentulous human mandible, achieved from a model, 2 or 4 microunit analog abutments were embedded (Master; Conexao Systems Prosthodontics, São Paulo, Brazil), settled in interforaminal region. Three models resin (Araltec Chemicals Ltda, Hunstman, Guarulhos, with...

This study verified the surface microroughness of denture acrylic resins submitted to toothbrushing, chemical disinfection and thermocycling procedures.Samples were prepared according conventional, microwaved boiled measurements before after procedures using a profilometer (Ra). Data subjected anova Tukey's test (5%).Before thermocycling, difference was found among treatments for resins, with greater values toothbrushing lower Efferdent hypochlorite; control intermediate. Differences...

This study aimed to evaluate the influence of casting procedure and cyclic loading prosthetic frameworks on detorque screws marginal misfit single unit implant-supported prostheses.Twenty specimens were obtained, each one consisting a set an implant (external hexagon 3.75 × 13 mm - Branemark type), abutment (entirely calcinable or overcasted UCLA) screw. After tightened with 30 Ncm torque released 24 h later in order initial detorque. The retightened gaps assessed. All submitted 10(6)...

The purpose of this study was to test the effect brushing on surface roughness two resilient liners (Luci Sof and Sofreliner) compared with an acrylic resin (QC 20).Twenty specimens each material were prepared (25 mm x 14 3 mm). Ten served as controls stored in distilled water not brushed. remaining ten subjected mechanical brushing, using MSEt plus machine simulate at a rate 5.0 strokes per second (30,000 cycles). Surface measurements recorded before after brushing. Random samples analyzed...

Summary This study evaluated the precision of fit implant frameworks cast in titanium (cp Ti) and palladium–silver alloy (Pd‐Ag), made by one‐piece laser welding techniques. From a metal matrix with five implants, 20 master casts were obtained, to which replicas implants incorporated. On these masters 10 for each type material Ti Pd‐Ag alloy). Half technique other half technique. The implant/prosthesis interface was analysed measured vestibular lingual regions central distal help measuring...

The aim of this study was to evaluate the effect different accelerated aging times on permanent deformation and tensile bond strength two soft chairside liners, acrylic resin (T) silicone (MS) based.Different specimens were made for each test reliner. (n = 10) submitted 2, 4, 8, 16, 32, 64 cycles. Tensile testing performed at a crosshead speed 5 mm/min with compressive load 750 gf. Data Mann-Whitney compare materials times, Kruskal-Wallis Dunn tests used comparing intervals within given...