Diametral tensile strength and film thickness of an experimental dental luting agent derived from castor oil.

Unlabelled: The need to develop new dental luting agents in order to improve the success of treatments has greatly motivated research.

Objective: The aim of this study was to evaluate the diametral tensile strength (DTS) and film thickness (FT) of an experimental dental luting agent derived from castor oil (COP) with or without addition of different quantities of filler (calcium carbonate - CaCO3).

Material And Methods: Eighty specimens were manufactured (DTS N=40; FT N=40) and divided into 4 groups: Pure COP; COP 10%; COP 50% and zinc phosphate (control).

Influence of microwave sterilization on the cutting capacity of carbide burs.

Objective: This study compared the cutting capacity of carbide burs sterilized with microwaves and traditional sterilization methods.

Material And Methods: Sixty burs were divided into 5 groups according to the sterilization methods: dry heat (G1), autoclave (G2), microwave irradiation (G3), glutaraldehyde (G4) or control - no sterilization (G5). The burs were used to cut glass plates in a cutting machine set for twelve 2.

Partial purification and characterization of pectin methylesterase from acerola (Malpighia glabra L.).

The enzyme pectin methylesterase (PME) is present in acerola fruit and was partially purified by gel filtration on Sephadex G-100. The results of gel filtration showed different PME isoforms. The total PME (precipitated by 70% salt saturation) and one of these isoforms (fraction from Sephadex G-100 elution) that showed a molecular mass of 15.