European Journal of Prosthodontics and Restorative Dentistry

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September 2011
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The Effect on Cast Post Dimensions of Casting Investment and Airborne Particle Abrasion

Abstract - Cast posts can sometimes prove difficult to seat fully during fitting. This study compared two different liquid/water dilutions for phosphate bonded investment and the effect of controlled airborne particle abrasion on resulting post diameter. After measuring polymeric post patterns (n=18), 3 groups were invested using concentrated solution and 3 groups using dilute solution. After casting they were weighed and remeasured then exposed to airborne particle abrasion. Both solutions produced oversized cast posts. Mean diameter reduction during airborne particle abrasion was 8 μm/10s taking an average of 41s to reach precast size. Where a post pattern fits tightly, airborne particle abrasion for 70s should reduce the casting sufficiently to accommodate the cement lute.

KEY WORDS: Cast posts, Phosphate bonded investments, Airborne particle abrasion

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Danya Hashem, Matthew J. German, Robert W.Wassell

Articles from this issue

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  1. An Audit of Shade Reproduction of Fixed Metal Ceramic Prostheses
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  3. 98

  1. An Evidence Based Approach for the Provision of Resin-Bonded Bridgework
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  1. The Influence of Storage on Dimensional Changes in Maxillary Acrylic Denture Bases and the Effect on Tooth Displacement
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  1. In Vitro Failure of Crowns Produced by Two CAD/CAM Systems
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  1. Splinting Effect on Posterior Implants Under Various Loading Modes: A 3D Finite Element Analysis
  2. 117
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  1. The Effect on Cast Post Dimensions of Casting Investment and Airborne Particle Abrasion
  2. 123
  3. 130

  1. Immediate Replacement Complete Dentures: Pitfalls of Ignoring Traditional Teaching and Established Practice
  2. 131
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  1. Acrylic Strengthened Casts for Removable Partial Denture for Occlusion Equilibration
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  1. Erratum notice
  2. 137
  3. 137