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Effect of denture wax-pattern position on radial setting expansion
D R Davis1, J L Watters, J H Nguyen
1University of California, San Francisco, Department of Restorative Dentistry 94143.
Clinical Materials
|December 9, 1992
Summary
The setting expansion of gypsum-bonded investment, crucial for dental castings, was studied. Findings suggest its expansion behaves like a viscous fluid
Area of Science:
- Materials Science
- Fluid Mechanics
- Dental Materials
Background:
- The setting expansion of gypsum-bonded investment is complex and not fully understood.
- Accurate expansion is critical for precise dental restorations.
Purpose of the Study:
- To investigate the fluid mechanics of gypsum-bonded investment during setting.
- To determine if wax patterns affect the investment's setting expansion.
Main Methods:
- Mesial-occlusal-distal (MOD) wax patterns were placed at various positions in casting rings.
- Xeroradiography was used to measure total expansion.
- Radial expansion was analyzed at different axial and radial locations.
Main Results:
- Gypsum-bonded investment expansion exhibits characteristics of laminar fluid flow.
- Expansion patterns varied based on radial and axial positions within the casting ring.
Conclusions:
- The study provides insights into the fluid dynamics of gypsum-bonded investment setting.
- Understanding these dynamics can help optimize the casting process for dental restorations.