Acid Etching Time Research Articles

Surface treatment studies aimed at streamlining fissure sealant application.

Three laboratory studies were carried out with the aim of improving or streamlining enamel surface treatment procedures in fissure sealing. In Study 1, the effect of reducing acid etch time from 60 s to 10 s was assessed by SEM and tensile bond strength measurements. Reduction in etch time produced a finer etch pattern, gave a reduced but still high, bond-strength, albeit with slightly poorer long-term adhesion. Study 2 showed that a conventional acid etch treatment could completely remove acquired pellicle, without prior prophylaxis. SEM studies and bond-strength measurements corroborated this view. In Study 3, compressed air and chemical drying agents were compared for drying speed and efficiency. Compressed air gave more rapid, thorough drying, and greater resultant bond strengths.

The prebond surface preparation of 301 stainless steel alloy

It was demonstrated that an acid etch increased the bond strength and environmental durability of 301 stainless steel bond joints. During the course of the acid etch, it was noted that a silicon rich smut was deposited on the adherend surface. Experimentation verified that a sodium dichromate/sulphuric acid solution removed the smut.It was noted that if the smut was not removed, the resulting bond joint was environmentally less stable than one which had been desmutted. Environmentally stable bond joints were obtained with an etch time of five minutes, acid concentration of twenty percent, and a temperature of 61°C, followed with a sodium dichromate/sulphuric acid desmut. From the etch data obtained, an empirical relationship relating weight loss to acid concentration, etch time, and temperature was established. SEM and Auger analysis characterized the surface characteristics of smutted and desmutted bonding surfaces.

A histologic comparison of pulpal response to varying the acid etching time of tooth enamel in the direct bonded bracket technique

A histologic comparison of pulpal response to varying the acid etching time of tooth enamel in the direct bonded bracket technique