Composite materials have become an integral part of the wide range of filling materials currently available. Conditioning is necessary to achieve adequate bonding of the composite material to enamel and dentin. Normally, this is done by applying acid preparations to the dental surfaces. These acids have an etching effect that causes surface roughening. The increasing application of lasers in dentistry has introduced another possibility. Laser irradiation can cause roughening of enamel and dentin surfaces. Another interesting alternative is the so‐called kinetic cavity preparation technique. This method also results in distinct surface roughening. The purpose of the present study, was to compare the described methods. Tensile bond strength tests and shear bond tests were carried out to examine the adhesion of a composite material to surfaces treated with these methods. Laser irradiation with certain devices and the air‐abrasive technique yielded results similar to those with acid etching.
For the three radioactive gases the use of the terms radon (Rn), thoron (Tn), and actinon (An) is recommended (Z. anorg. Chem., 103, 79 (1918)), and as general term for elements of atomic number 86 the retention of the word "emanations" (Em) for the three isotopes. The words emanate, emanating power, etc., are retained.1 To facilitate desirable changes and additions in subsequent years it is requested that data, notes and suggestions be sent to:
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