Aims: evaluate the differences of infiltration by apical surface after apicoectomy and different kinds root finishing. Materials method: Sixty human cuspids were endodontically treated received apicoectomy, divided in three alleatory groups. Group I no finishing apicoectomy. II standard multifluted bur III same group II, plus brunishing bur. Root surfaces canal coated with nail polishing except...

microleakage can be responsible for tooth hypersensitivity, secondary caries, and the possibility of pathological pulp alterations in restored teeth. recently, alternative methods for tooth preparation such as laser irradiation have been studied; but there are limited studies on primary teeth. the aim of this in vitro study was to compare the degree of microleakage of composite restorations pre...

introduction: surface roughness can increase the retention of castings by ridges and grooves that are microretentive. this study compared the retention of implant-supported crowns when used with 3 different surface roughness abutments and one temporary cement. methods: thirty solid abutments (iti), 4 mm high, were divided into three groups randomly. in the first group, 10 abutments were roughen...

o bjectives: bond strength of composite resin to enamel and dentin of primary teeth is lower than that to permanent teeth; therefore, it may compromise the ad- hesive bonding. new methods, such as laser application have been recently intro- duced for tooth preparation. the purpose of this study was to evaluate the effect of tooth preparation with bur and er:yag laser on shear bond strength of c...

statement of problem: in some clinical situations, repair of composite restorations is treatment of choice. improving the bond strength between one new and old composite usually requires increased surface roughness to promote mechanical interlocking since chemical bonding might not be adequate. similarly, the treatment of a laboratory fabricated resin composite restoration involves the same pro...

Genomic sequences with a cluster of ATC sequence stretches where one strand consists exclusively of well mixed As, Ts, and Cs confer high base unpairing propensity under negative superhelical strain. Such base unpairing regions (BURs) are typically found in scaffold or matrix attachment regions (SARs/MARs) that are thought to contribute to the formation of the loop domain structure of chromatin...

Bur. Stand. J . Res., Wash., 7, 329. Rossini, F. D. 1934a Bur. Stand. J . Res., Wash., 12, 735. Rossini, F. D. 19346 Bur. Stand. J . Res., Wash., 13, 21. Rossini, F. D. 1940 Chem. Rev. 27, 1. Savard, J. 1937 Rev. faculte sci. univ. Istanbul, New Ser. 2, 235. Schmid, R. 1936 Z. Phys. 99, 274. Schmid, R., Gerd, L. & Zemplen, J. 1938 Proc. Phys. Soc. 50, 283. Shidei, T. 1936 Jap. J . Phys. 11, 23....

OBJECTIVES The purpose of this in vitro study was to evaluate whether mechanical alteration of the enamel surfaces with air abrasion and bur abrasion techniques could enhance the bonding performance of a three step and a self etching adhesive resin systems to enamel. METHODS 126 extracted lower human incisor teeth were used. The teeth were divided into three groups including 40 teeth each. Fi...