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Soldering Materials

Soldering Materials. Prepared by: Dental Materials Department Yenepoya Dental College, Yenepoya University, Mangalore. Terminology. Welding two pieces of metal are joined together directly (generally without adding a third metal)

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Soldering Materials

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  1. Soldering Materials Prepared by: Dental Materials Department Yenepoya Dental College, Yenepoya University, Mangalore.

  2. Terminology • Welding • two pieces of metal are joined together directly (generally without adding a third metal) • The metal pieces are heated to a high enough temperature so they attach to each other. • Soldering and Brazing • two pieces of metal are joined by adding a third metal • Temp. < 425oC  Soldering • Temp. > 425oC  Brazing • In dentistry, it is most commonly called soldering although the temp. used is above 425oC.

  3. Types of Solders • Soft solder: lead-tin alloys, low melting range (< 260oC) • Known as “plumber’s” solder • Hard solder: high melting range, requires special melting methods • Gold-based solders: good tarnish and corrosion resistance, extensively used in crown and bridge applications • Silver-based solders: commonly used in orthodontic appliances

  4. Ideal solder • Ease of flow at relatively low temperature • Sufficient fluidity to freely flow when melted • Strength compatible with that of the structure being soldered • Acceptable color to give an inconspicuous joint • Resistance to tarnish and corrosion • Resistance to pitting during heating and application

  5. Composition of Dental Gold Solders *Fusion temp. should be at least 50oC below the solidus temp. of the parent (or substrate) alloys.

  6. Mechanical Properties of Dental Gold Solders

  7. Techniques of Dental Soldering • Free-hand soldering • Used in assembling orthodontic and other appliances • Investment soldering • Used in assembling bridges and similar restorations

  8. Soldering Torch

  9. Parent Alloy  granular structure Solder  granular structure Wire  fibrous structure

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