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:: Volume 21, Issue 4 (Winter (Special Issue) 2004) ::
J Dent Sch GYEAR__, 21(4): 701-713 Back to browse issues page
Effect of dry and wet ring liners on marginal gap of casting crowns
Abolfazl Sabouri Corresponding Author: Dr. * 1, Maziyar Sheikholeslami Dr.
Abstract:   (5202 Views)

Aim: Due to the importance of marginal adaptationf casting restorations on prepared teeth and the effect of investing methods over it and the contradictions found in the results of the studies, this study evaluated the marginal gap of full casting crowns fabricated with “one layer dry ring liner” and “one layer wet ring liner”.

Method & Materials: The study conducted experimentally. 10 of the same wax patterns, immediately after refining margin on the metal die, were invested under each foretold investing method, using phosphate-bonded investment (Accufit). Casting were produced using base metal alloy (Verabond). Marginal gap of each casting, along four predetermined reference marks on the die, under stereoscopic microscope, were photographed by digital camera. Then a “blind” operator performed the measurements in micron using scale of photoshop. Data were analyzed with Univariate ANOVA at P=0.05.

Results: Marginal gap (Mean±SD) of castings fabricated with the “one layer wet ring liner” was (86±33μm) and with the “one layer wet ring liner ” was (46±32μm). One layer wet ring liner produced statistically significant (P<0.001) smaller marginal gap than “one layer dry ring liner”. Marginal gap showed no statistically significant (P>0.05) difference among along four reference marks in each investing method. Distribution of dispersion and inconsistency of casting fit showed no statistically significant (P=0.524) difference between investing methods.

Conclusion: “One layer wet ring liner” is more desirable method to fabricate dental castings with clinically acceptable marginal gap than “one layer dry ring liner”.

J Dent Sch 2004 21(Special Issue): 701

Keywords: Marginal gap, Dry ring liner, Wet ring liner, Fitness, Ring liner, Casting
Full-Text [PDF 551 kb]   (1224 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2006/09/6
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Sabouri A, Sheikholeslami M. Effect of dry and wet ring liners on marginal gap of casting crowns. J Dent Sch. 2004; 21 (4) :701-713
URL: http://jds.sbmu.ac.ir/article-1-629-en.html


Volume 21, Issue 4 (Winter (Special Issue) 2004) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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