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Can postpolymerization for 3D-printed interim restorations be improved?

Fabio A P Rizzante1, Pedro Magão2, Guilherme Moura3

  • 1Associate Professor and Director of Research, Department of Oral Rehabilitation, James B. Edwards College of Dental Medicine, Medical University of South Carolina, Charleston, S.C.

The Journal of Prosthetic Dentistry
|December 2, 2022
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Summary
This summary is machine-generated.

Optimizing postpolymerization is key for 3D-printed dental restorations. Using a broadband LED device for 120 seconds significantly enhances flexural strength and color stability in 3D-printed resins.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Additive Manufacturing

Background:

  • Postpolymerization significantly impacts the mechanical and aesthetic properties of 3D-printed dental materials.
  • Current postpolymerization techniques are time-consuming, potentially limiting chairside adoption by dentists.
  • Limited data exists on how various postpolymerization workflows affect the flexural strength and color stability of 3D-printed interim restorations.

Purpose of the Study:

  • To evaluate the influence of different postpolymerization methods on the flexural strength of 3D-printed resins.
  • To assess the impact of various postpolymerization techniques on the color stability of 3D-printed resins.
  • To compare the efficacy of different postpolymerization workflows for interim dental restorations.

Main Methods:

  • Three distinct 3D-printing resins (CT, DT, CB) were subjected to four postpolymerization methods: a standard polymerization chamber (FC), a broadband LED device at two time intervals (V40, V120), and a custom UV LED chamber (CC).
  • Flexural strength was measured using a universal testing machine after polymerization and after 10,000 thermal cycles.
  • Color stability was assessed spectrophotometrically at baseline, after 7 days of dry storage, and after 24 hours of artificial aging.

Main Results:

  • Flexural strength varied significantly across resins, postpolymerization methods, and times. Resin CT exhibited the highest strength, while DT showed the lowest. Longer LED exposure (V120) generally yielded higher strength.
  • Thermocycling negatively impacted flexural strength in specific combinations (e.g., CB with FC/V120, DT with V40).
  • Color stability also showed significant differences. Highest color change (ΔE) was observed for DT with V40 after artificial aging, while the lowest was for DT with V120 after 7 days of dry storage.

Conclusions:

  • Postpolymerization using a broadband LED device for 120 seconds resulted in superior flexural strength and color stability compared to other tested methods.
  • This optimized LED postpolymerization technique offers a promising approach for enhancing the performance of 3D-printed interim dental restorations.
  • The findings suggest that specific postpolymerization protocols can significantly improve the clinical viability of 3D-printed dental materials.