The Effect of Elastomeric Impression Materials and Gingival Sulcus Widths on the Dimensional Accuracy of Stone Die
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Abstract
The aim of this study was to compare the dimensional accuracy of replicating stone dies poured from four elastomeric impression materials taken on three clinically simulated sulcular widths (0.1,0.2 and 0.4 mm). Four elastomeric impression materials [Vinylpolyethersiloxane (Identium®), Hydrophilic polyvinylsiloxane (Hydrorise), Hydrophobic polyvinylsiloxane (Variotime®) and Soft polyether (ImpregumTM Penta Soft)] were used to make 12 impressions of metal die of each sulcular widths by double-mix, single impression technique. Thus, a total of 144 impressions were made. The impressions were disinfected and left for 30 minutes. Then, Type IV dental stone (Vel-MixTM) were mixed and carefully vibrated into impressions. When dies stone completely set, the dies were removed and areas beyond finish line were trimmed. The diameter of gypsum dies at finish line were subjected to measurement in B-L as well M-D direction using measuring microscope with linear resolution 0.001 mm, 30X magnification. The mean diameter of dies stone were subtracted from metal die diameter. Subsequently, percent distortion of dies stone were calculated to represent an accuracy. The data was statistically analyzed by Two-way ANOVA and Tukey’s HSD test. The results showed that there was statistically significant interaction between sulcular widths and impression materials on accuracy of die stone (F=6.486, P<.01). Vinylpolyethersiloxane has been revealed the significantly lower distortion of die stone at 0.2 and 0.1 sulcus width. When considering the distortion among three sulcular widths, the wider sulcular width (0.4 mm) provides more accurate die stone than narrower sulcus. It could be concluded that Vinylpolyethersiloxane gave the most accurate die stone of all materials tested. This material may be alternative to the polyvinylsiloxane and polyether in impression making for definitive cast and dies.
Article Details
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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