AIM Relating the marginal fit of the castings, to the accuracy of the impression produced using laminated hydrocolloid impression technique, alginate and double-mixed polyvinyl siloxane. Basic objective of the study is to check the feasibility of the use of laminated hydrocolloid impression technique in the fixed partial denture. MATERIALS AND METHODS The precisely machined metal die was desi...

OBJECTIVES The aim of this study was to compare the accuracy of dental implant impressions obtained by a combination of different impression techniques and viscosities of polyvinyl siloxane (PVS). MATERIALS AND METHODS Four parallel fixtures were placed between mental foramina in a master model of lower dental arch. Three different viscosities (putty/light body, medium body/light body, and mo...

BACKGROUND Autoclave sterilization and microwave sterilization has been suggested as the effective methods for the disinfection of elastomeric impressions, but subjecting elastomeric impressions to extreme temperature may have adverse effects on critical properties of the elastomers. AIM To evaluate the effect of chemical disinfection as well as autoclave and microwave sterilization on the su...

The dimensional stability of a thin intra sulcular impression material reproducing the preparation finish line was evaluated. Impressions were taken of a stainless-steel master model of a simulated abutment with a 'gingival sulcus' using Express regular, Express fast and Aquasil. The putty-wash two-step technique was applied with spacer thicknesses of 0.5, 1 and 1.5 mm. Mid mesiodistal and bucc...

Objectives: This study compares the linear dimensional accuracy between one step and two-step impression techniques using polyvinyl siloxane material. Methodology: The Randomized controlled trial was done in Department of Prosthodontics, FMH College Medicine Dentistry Lahore Pakistan Council for Science Industrial Research Lahore. All samples which fall under inclusion criteria were included. S...

A series of polyimidesiloxane (SIM) copolymers, based on a.co-aminopropylpoly(dimethylsiloxane)(PDMS),2,2-bis(4-[4-aminophenoxyl]phenyl)propane(BAPP)and 4,4'-oxydiphthalic-anhydride(ODPA) was synthesized in our laboratories. We investigated the effect of siloxane segment length on the surface composition of the SIM copolymers and its role in adhesion. The aim is to elucidate the correlation bet...

Background: Comparatively evaluate the accuracy of two different implant impression techniques. Materials & methods: For present study, reference models used were an edentulous mandibular cast with four analogues in anterior region and a metallic insert posterior. Two techniques studied as followed: Group 1: Polyvinyl siloxane impressions (putty light body) using stock metal tray, 2: Polyet...

In the present paper, we describe a new and original method to obtain transparent, siloxane-based composites, with high refractive index (up to 1.68). The method is based on the decomposition of Zn-siloxane, mixed with a poly-(dimethyl)-block-(phenyl)siloxane matrix in different ratios. It was found that after treatment of such mixed metal-containing polymer blend with H2S, the nanoparticles of...