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Ceramic inserts do not generally improve resin composite margins.

W O Strobel1, A Petschelt, M Kemmoona

  • 1Department/Policlinic of Operative Dentistry and Periodontology, University of Erlangen-Nuremberg, Erlangen, Germany.

Journal of Oral Rehabilitation
|July 14, 2005
PubMed
Summary
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Ceramic inserts, specifically Cerana and SonicSys, significantly reduced gaps in posterior resin composite fillings. However, SonicSys inserts were not recommended for deep cavities due to lack of marginal integrity improvement.

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Polymerization shrinkage in resin composites can lead to marginal gaps.
  • Ceramic inserts are hypothesized to mitigate this shrinkage.
  • Evaluating insert systems is crucial for improving restoration longevity.

Purpose of the Study:

  • To assess the efficacy of different ceramic insert systems in reducing polymerization shrinkage.
  • To evaluate the impact of thermomechanical loading on marginal integrity.
  • To compare insert performance at enamel and dentin margins.

Main Methods:

  • Class II cavities in human molars were restored with various insert systems (Cerana, SonicSys, beta-quartz).
  • Specimens underwent thermomechanical loading (100,000 cycles, 50 N, 2500 cycles 5°C/55°C).

Related Experiment Videos

  • Scanning electron microscopy (200x) examined tooth/composite and insert/composite interfaces before and after loading.

    • Main Results:

    • Cerana and SonicSys inserts significantly reduced interfacial gaps in enamel.
    • Beta-quartz inserts showed no significant gap reduction.
    • SonicSys inserts did not improve marginal integrity in dentin-bordered cavities.
    • Bonding between IPS Empress inserts (Cerana, SonicSys enamel) and composite was promising.

    Conclusions:

    • Cerana and SonicSys inserts effectively reduce gaps between resin composite and tooth structure in enamel-bordered cavities.
    • The use of SonicSys inserts in deep proximal cavities is not recommended.
    • Further research into insert materials and designs is warranted for optimal restorative outcomes.