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Vertical dimensional stability and rigidity of occlusal registration materials
Mary P Walker1, Edis Wu, M Elizabeth Heckman
1University of Missouri, Kansas City School of Dentistry, MO, USA.
General Dentistry
|November 12, 2009
Summary
This study found that bisacrylate occlusal registration materials are more rigid than vinyl polysiloxane (VPS) but can lead to greater dimensional inaccuracies over time. Dentists should consider material properties for accurate restorative dentistry.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials Engineering
Background:
- Accurate occlusal registration records are critical for successful restorative dentistry.
- Registration materials must maintain dimensional stability over time for repeated or delayed use.
- Material rigidity is hypothesized to correlate with reduced distortion and improved accuracy.
Purpose of the Study:
- To compare the rigidity and dimensional accuracy of a bisacrylic material versus a vinyl polysiloxane (VPS) occlusal registration material.
- To evaluate how these properties influence the accuracy of interarch measurements over time.
- To determine the impact of material choice on vertical dimensional changes in occlusal records.
Main Methods:
- Maxillary and mandibular typodont arches were prepared with simulated edentulous spaces and bridge abutments.
- Vertical interarch measurements were recorded using digital photography before and after creating occlusal records.
- Ten interocclusal records were made with bisacrylate and VPS materials, with mounting at 48, 72, and 120 hours.
- Material hardness/rigidity and vertical dimensional changes were measured and analyzed.
Main Results:
- Both bisacrylate and VPS materials showed increased posterior vertical openings compared to anterior openings.
- The bisacrylate material exhibited significantly greater posterior vertical openings than VPS at 48 and 72 hours.
- Bisacrylate demonstrated a larger anterior opening than VPS across all measurement times.
- Bisacrylate consistently showed a significantly higher hardness number than VPS at all measurement times.
Conclusions:
- While bisacrylate materials are more rigid, they may introduce greater dimensional instability in occlusal registrations compared to VPS.
- Material selection significantly impacts the accuracy of vertical interarch measurements, particularly in posterior regions.
- Understanding the trade-offs between rigidity and dimensional stability is crucial for selecting appropriate occlusal registration materials in dentistry.
