Effects of support-structure design and postpolymerization protocols on dimensional changes in three-dimensionally...

Area of Science:

• Biomaterials Science
• Dental Technology
• Additive Manufacturing

Background:

• Additive manufacturing (AM) is increasingly used for fabricating complete dentures.
• However, the impact of varying support-structure designs and postpolymerization heat treatments on denture accuracy is not well understood.

Purpose of the Study:

• To investigate how different support-structure designs and postpolymerization protocols affect the dimensional accuracy of 3D printed complete dentures.

Main Methods:

• Maxillary complete dentures were 3D printed using conventional and tree-like support structures.
• Specimens underwent postpolymerization heat treatment at 40°C, 60°C, or 80°C for 15 or 30 minutes.
• Optical scanning and 3D analysis software were used to evaluate trueness and precision using root mean square error (RMSE).

Main Results:

• Tree-like support structures resulted in lower RMSE values for both trueness and precision compared to conventional structures.
• Postpolymerization protocols significantly impacted both trueness and precision.
• Optimal accuracy (lowest RMSE) was achieved with the tree-like structure at 60°C for 30 minutes.

Conclusions:

• A tree-like support structure combined with a 60°C, 30-minute postpolymerization protocol enhances the dimensional accuracy of the intaglio surface of 3D printed complete dentures.
• The interplay between support structure design and postpolymerization conditions is crucial for optimizing the accuracy of additively manufactured dentures.