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Curing efficiency of different polymerization methods through ceramic restorations.

H Jung1, K H Friedl, K A Hiller

  • 1Department of Operative Dentistry and Periodontology, University Clinics, Regensburg, Germany. heike.jung@klinik.uni-r.de

Clinical Oral Investigations
|October 20, 2001
PubMed
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Conventional and soft-start polymerization methods demonstrate superior curing efficiency through ceramic restorations compared to plasma arc curing, especially when using a catalyst. This ensures better composite resin luting material properties.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Accurate curing of composite resin luting materials through ceramic restorations is crucial for long-term dental prostheses success.
  • Different polymerization methods may affect the degree of conversion and mechanical properties of luting composites.
  • Understanding curing efficiency is vital for selecting optimal light-curing techniques in clinical practice.

Purpose of the Study:

  • To evaluate and compare the curing efficiency of three polymerization methods (conventional, soft-start, plasma arc) for composite resin luting materials beneath ceramic restorations.
  • To assess the impact of a catalyst on the depth of cure and universal hardness of the luting composite.
  • To determine the optimal polymerization technique for achieving adequate material properties through ceramic barriers.

Related Experiment Videos

Main Methods:

  • An in vitro study involving 36 ceramic specimens (Empress 2) luted with composite resin (Variolink II) with and without a catalyst.
  • Polymerization was performed using conventional (40s), soft-start (40s), or plasma arc curing (10s).
  • Depth of cure (ISO 4049) and universal hardness (0.5mm and 1.0mm depth) were measured using a universal testing machine.

Main Results:

  • Both conventional and soft-start polymerization yielded greater hardness compared to plasma arc curing, particularly when no catalyst was used.
  • The addition of a catalyst consistently improved both hardness and depth of cure across all tested polymerization methods.
  • Conventional and soft-start polymerization resulted in a greater depth of cure than plasma arc curing through the ceramic specimens.

Conclusions:

  • Plasma arc curing exhibits lower curing efficiency through ceramic restorations compared to conventional and soft-start polymerization methods.
  • The use of a catalyst significantly enhances the curing performance of composite resin luting materials, irrespective of the polymerization technique.
  • Conventional and soft-start polymerization are recommended for achieving optimal curing of luting composites beneath ceramic restorations.