the aim of this study was to assess the effect of 30% hydrogen peroxide on the microleakage of class v cavities restored with either a silorane-based composite or two methacrylate-based composites.a total of 96 standard class v cavities (1.5 × 2 × 3 mm) were prepared on the buccal surface of sound extracted human premolars with both enamel and dentin margins and randomly assigned into three gro...

microleakage is a main cause of restorative treatment failure. in this study, we compared occlusal and cervical microleakage of two self-adhesive cements after 24 hours and two months.in this in-vitro experimental study, class ii inlay cavities were prepared on 60 sound human third molars. composite inlays were fabricated with z100 composite resin. the teeth were randomly assigned to six groups...

backgrounds the degree of microleakage is one of the main criteria in evaluating the restorative materials such as glass ionomer (gi) restoratives, which are available in two forms: loose powder and liquid form to be hand-mixed or pre-proportioned in a capsule to be mixed mechanically. objectives this study was conducted to compare the microleakage of encapsulated gi restoratives with their han...

background and aims. newer curing units such as plasma arc can polymerize the sealants in much shorter curing times. the aim of this study was to compare the effect of two different curing units on the micro-leakage of a fissure sealant material. materials and methods. sixty two extracted premolars without caries were randomly divided into two groups of 31 samples. occlusal surfaces of all teet...

objectives : the aim of this in-vitro experimental study was to assess the effect of application of a desensitizing varnish on the enamel and dentin marginal seal. materials and methods: seventy-two freshly extracted, intact human premolar teeth were divided into four groups (n=18). class v cavities (3mm in length, 2mm in width and 2mm in depth) were prepared on the buccal surface of each tooth...

introduction: the purpose of this study was to evaluate the sealing ability of dentin bonding agents in root canals obturated with gutta-percha and mta. methods: forty-five single rooted human premolar teeth were decoronated so that remaining root portions were 12 mm in length. the samples were divided randomly into three experimental (n=13) and two control groups (n=3). all teeth were instrume...

To address the drawback of low thermal conductivity conventional organic phase change materials (PCMs), a paraffin-wax-based composite (PCC) was assembled via vacuum impregnation method, using new type carbon fiber network material as supporting matrix. The sheet (CFS) exhibited structure comprising high-thermal-conductivity fibers, beneficial for enhancing heat transfer properties PCC. sheet-s...

The present experimental study reports the thermal performance analysis of a phase change material (PCM)-basedfinned heat sink placed on silicone rubber heater which mimics CPU chip and is cooled by natural forced convection. subjected to constant cyclic loading for five input power values (4, 6, 8, 10, 12 W). Paraffin wax 1-hexadecanol are selected as PCM this study, have melting points in ran...

in this study, medium density fiberboard (mdf), was produced by dry process using refined fibers from choob khazare caspian amol factory, with 3 levels of urea formaldehyde adhesive at 8, 10, and 12 percent, and 3 levels of paraffin at 0.5, 1, and 1.5 percent. from every treatment, cylindrical samples for permeability measurement with 13 mm in diameter, and 30 mm of height were cut using hole-s...