Three-dimensional analysis of maxillary denture displacement during reline impression procedure

Area of Science:

• Dental Prosthodontics
• Biomaterials Science

Background:

• Denture relining aims to improve fit and function.
• Denture displacement during relining can lead to occlusal inaccuracies.
• Quantitative assessment of displacement is crucial for material and technique selection.

Purpose of the Study:

• To quantitatively evaluate maxillary denture displacements caused by different impression materials and techniques during relining.
• To identify impression materials and techniques that minimize denture displacement.

Main Methods:

• Utilized a contourmeter to measure three-dimensional denture displacements.
• Compared displacements resulting from various impression materials: tissue-conditioning material, light-bodied polysulfide, regular-bodied polysulfide, and zinc oxide and eugenol.
• Evaluated both open-mouth and closed-mouth impression techniques.

Main Results:

• Tissue-conditioning material (closed-mouth) and light-bodied polysulfide (open- or closed-mouth) resulted in the least denture displacement.
• Regular-bodied polysulfide and zinc oxide and eugenol materials caused greater displacements.
• No significant difference in displacement was observed between open- and closed-mouth techniques for the same impression materials.

Conclusions:

• Specific impression materials (tissue-conditioning, light-bodied polysulfide) are preferable for minimizing maxillary denture displacement during relining.
• Post-relining occlusal adjustments are essential to correct inaccuracies caused by denture displacement.