:: Volume 21, Issue 1 (Spring 2003) ::
J Dent Sch GYEAR__, 21(1): 52-60 Back to browse issues page
A comparison of two soldering techniqueon pre and post curing bond strength of procelain
Mahasti Sahabi Corresponding Author: Dr. * , Hassan Sazgara Dr.
Assistant Prof.
Abstract:   (7525 Views)

Aim: The aim of this study was to compare tensile strength of pre-solder and post-solder joints for three dental alloys. 45 rods, 32 mm in length and 25mm in diameter were made from degubond 4 (Au-Pd-Ag), person 4 (Pd-Ag) and verabond (ni-Cr-Be).

Methods & Materials: 15 rods for each alloy randomly divided in to three groups of control, presolder and postsolder. 10 rods of each alloy were cut in half with a custom made cutting Jig and then positioned and stabilized at 13 mm gap distance in an indexing Jig. Rods of deubond 4 and porson 4 were given a heat treatment to simulate porcelain firing. Specimens were soldered with manufacturers recommended solder with gas-oxygentorch (pre-soldering). Verabond speciments were soldered with gold and base-metal solder.Tensile testing was done on an instron machine. Model AB 725-AM.SM.At cross head speed of 2mm/min and result were recorded in kilogram.

Results: 1- For degubond 4, techniques of soldering has no significant effect on tensile strength of solder joints.

            2- For porson 4, tensile strength of presolder joints are significantly stronger than post-solder joints.

            3- The tensile strength of presolder joints for degubond 4 and porson 4 are significantly stronger than verabond.

Conclusion: Tensile strength of solder joints depends on different factors such as type of alloy and soldering technique however this is not dearly predictable.

J Dent Sch 2003 21(1)52   

Keywords: dental alloys, solder, pre-soldering, post-soldering, tensile strength
     
Type of Study: Original Article | Subject: Special
Received: 2006/09/6


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Volume 21, Issue 1 (Spring 2003) Back to browse issues page