OBJECTIVES The purpose of this in vitro study was to evaluate the microleakage and penetration of fissure sealant in permanent molar teeth with fluorosis after pretreatment of the occlusal surface. MATERIALS AND METHODS A total of 120 third molars with mild dental fluorosis were randomly divided into 6 groups (n = 20). The tooth surfaces were sealed with an unfilled resin fissure sealant (FS)...

PURPOSE To search if the shear bond strengths of brackets would change after two different base-cleaning procedures such as sandblasting or carbide bur cleaning, and to determine if a previously bonded tooth surface had any effect on bond strength. MATERIALS AND METHODS A total of 120 new brackets were first bonded to 120 extracted premolars and then debonded and bond strength was recorded. T...

The purpose of this study is to evaluate effect a) Self glaze b) Over and c) Polishing on porcelain surface which subjected grinding with a diamond rotary instrument. To test theory 40 ceramic fused metal disc samples were fabricated. material used was Ivoclar Dsign. discs 10mm X 3mm 2mm substructure 1mm porcelain. specimens divided into four groups 10 each. first group left as fired or unglaze...

background: at the end of fi xed orthodontic treatment, the remnant of adhesive should be eliminated from the tooth surface. the purpose of this study was to compare the effect of three methods of removing adhesive on enamel surface roughness, dental pulp t emperature, and also on the time spent. materials and methods: the brackets on 90 extracted teeth were debonded using bracket removal plier...

Introduction: Emergency conditions of ingestion foreign objects in dental practice may occasionally occur, one which is burs. In most cases, the object passes through digestive tract without difficulty, but some require surgery. Immediate removal be necessary because long-term retention leads to complications and even death. Case Management: 21 years old man underwent procedures, five minutes a...

Solar energy is highly appreciated among different renewable sources due to its limitless potential and affordable conversion technologies. Conventionally, solar has multiple thermal applications, but now with the onset of photovoltaics (PV), there massive momentum for electricity generation. However, PV module faces a major challenge efficiency decrement an increased working temperature. Hence...

We report a systematic comparison of the steric properties of different stereoselective olefin polymerization catalysts using the percentage of buried volume, %V(Bur), as a molecular descriptor. For the first time, isoselective and syndioselective group 4 metallocenes are compared with group 4 isoselective phenoxy-amine and group 4 syndioselective phenoxy-imine catalysts using the same molecula...