Journal of Clinical and Diagnostic Research (Dec 2016)

Effect of Resin Bonded Luting Agents Influencing Marginal Discrepancy in All Ceramic Complete Veneer Crowns

  • Dhanraj Ganapathy,
  • Anusha Sathyamoorthy,
  • Hemalatha Ranganathan,
  • Karthikeyan Murthykumar

DOI
https://doi.org/10.7860/JCDR/2016/21447.9028
Journal volume & issue
Vol. 10, no. 12
pp. ZC67 – ZC70

Abstract

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Introduction: Marginal discrepancy severely affects the long term success of All ceramic complete veneer crowns. The precise role of resin luting agents influencing this phenomenon needs to be explored further. Aim: To estimate and compare the marginal discrepancy in CAD/CAM processed All ceramic complete veneer crowns prior and following luting with resin bonded luting agents. Materials and Methods: Extracted human maxillary first premolars were randomly allocated into four groups of 27 samples each Viz., Group I-Resin Modified Glass Ionomer Cement (GIC) (RelyX), Group II-Bis-GMA based dual cure resin cement (Variolink II), Group III-PMMA based resin cement (Superbond), Group IV- Urethane Dimethacrylate resin cement (Calibra). Following tooth preparation, CAD/CAM All ceramic complete veneer crowns were fabricated and sectioned and marginal discrepancy was evaluated using a scanning electron microscope (TESCAN, Magnification power-1,00,000x) prior and after luting with the experimental resin cements. Results: The vertical and horizontal discrepancy before and after cementation with Group I [270.08±103.10µm, 165.3±53.00µm and 270.86±102.70µm, 166.62±54.96µm respectively]; Group II [254.21±79.20µm, 117.75±24.29µm and 234.81±79µm, 116.89±18.22µm respectively]; Group III [272.47±86.25µm, 142.08±50.83µm and 251.82±62.69µm, 136.07±44.95µm respectively]; Group IV were [260.28±64.81µm, 116.98±17.71µm and 233.08±69.44µm, 116.58±21.13µm respectively]. ANOVA inferred a statistically significant difference between the four test specimen with regards to vertical and horizontal marginal discrepancy after cementation (F=9.092, p<0.001), (F=10.97, p<0.001). Tukey HSD Post-hoc test observed significant differences in vertical and horizontal marginal discrepancies between the resin modified glass ionomer and resin cements (p<0.05). Conclusion: Resin cements exhibited a greater reduction in the marginal discrepancy than the resin modified glass ionomer following luting in All ceramic complete veneer crowns. Hence resin cements are more preferable to GIC for luting All ceramic complete veneer crowns.

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