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Different Methods for Inlay Production: Effect on Internal and Marginal Adaptation, Adjustment Time, and Contact

M P Rippe, C Monaco, L Volpe

    Operative Dentistry
    |April 14, 2017
    PubMed
    Summary
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    Different production methods for resin and ceramic inlays were evaluated. Lithium disilicate ceramic inlays required more adjustment time than resin inlays, with varying marginal and internal adaptation results.

    Area of Science:

    • Restorative Dentistry
    • Dental Materials Science
    • Biomaterials Engineering

    Background:

    • Dental inlays are indirect restorations used to repair posterior teeth.
    • Production methods, including digital workflows and material types, can influence inlay performance.
    • Optimizing inlay fit and adjustment is crucial for long-term restoration success.

    Purpose of the Study:

    • To compare the marginal and internal adaptation, adjustment time, and proximal contacts of resin and ceramic inlays produced via different methods.
    • To evaluate the impact of digital versus conventional impression techniques and milling versus pressing fabrication methods.
    • To assess the clinical relevance of material choice (composite resin vs. lithium disilicate ceramic) in inlay fabrication.

    Main Methods:

    Related Experiment Videos

  • Forty premolars were prepared for inlays fabricated using four methods: digital/milled resin (LaRe), digital/milled ceramic (CeRe), digital/milled ceramic (CeDis), and conventional/pressed ceramic (PresDis).
  • Marginal and internal adaptation were measured using the replica technique.
  • Adjustment time and proximal contact tightness were quantified.

    • Main Results:

    • CeDis showed greater cervical marginal misfit (177.8 μm) compared to CeRe (116.7 μm); occlusal adaptation was similar across groups.
    • Axial wall adaptation varied, with LaRe (104.7 μm) showing more misfit than CeDis (66.7 μm) and CeRe (76.7 μm).
    • Lithium disilicate ceramic inlays required significantly more adjustment time than resin inlays. CeRe exhibited the tightest proximal contact (8.8 μm).

    Conclusions:

    • Production methods and material choice significantly impact inlay adaptation and adjustment efficiency.
    • Digital workflows and milled materials may offer advantages in specific adaptation parameters.
    • Further research is needed to correlate these findings with long-term clinical outcomes and patient satisfaction.