Effect of ring liner and type of investment on the diameter changes of cast posts

ABSTRACT

This study was directed to evaluate the influence of 1-a cellulose ring liner, and 2-the type of investment [conventional and shock heat phosphate bonded investment] on the diameter change of posts casts with two different alloys [Nickel Chromium and Silver Palladium]. The results revealed that, no significant differences in diameter change between the alloys tested when casted with or without ring liner in the two different investment materials used in this study. From the result of this study we concluded that, the use of unlined casting ring produced undersize cast post, which may be easier to fit and cemented in the prepared root canal, thus decrease chairside time. Under the condition of this study, it is better to cast post with nickel-chromium alloy. The accelerated casting technique offers a cost-effective and time-saving method: