Microleakage of Gradient Versus Translucent Monolithic Zirconia crowns bonded with Self-Adhesive Resin Cement.

Document Type : Original research articles

Authors

1 conservative dentistry (fixed prosthodontic department),Misr International University,Cairo, Egypt

2 Professor of Fixed Prosthodontics, Conservative Dentistry Department (Fixed Prosthodontics), Faculty of Oral & Dental Medicine, Misr International University, Cairo, Egypt.

3 Professor of Fixed Prosthodontics, Fixed Prosthodontics department. Faculty of Dentistry, Cairo University, Cairo, Egypt

Abstract

Background: One of the most influencing factors on the clinical longevity of indirect restorations is marginal microleakage. Presence of marginal gap results in exposure of the cement at the margins and its dissolution, followed by secondary caries, periodontal disease and microleakage. Data regarding microleakage of gradient monolithic zirconia have been deficient. Aim of the study: To assess the microleakage of monolithic crowns made of gradient zirconia (IPS E-max ZirCAD Prime, Ivoclar) compared to crowns made of Translucent 5Y zirconia (UTML,Katana) bonded with self-adhesive resin cement (Theracem,Bisco). Materials and methods: Sixteen monolithic zirconia crowns were constructed using the CAD/CAM system and divided randomly into two equal groups according to the type of zirconia. Group I: ZirCAD Prime crowns (n=8), while group II: UTML zirconia single crowns (n=8). Both groups were bonded with Theracem self-adhesive resin cement (Bisco) to 16 extracted first premolar teeth. After cementation, the teeth were subjected to thermocycling for 5000 cycles at changing temperature between 5°C and 55°C. The microleakage was measured by immersing the samples in 0.5% basic fuschin dye for 48 hours at 37℃. After the dye penetration, the crowns were sectioned vertically by Isomet Saw in a bucco-lingual direction to measure microleakage using stereomicroscope at 40X magnification. Results: There was no significant difference between leakage scores of the two tested groups. Conclusion: Both Groups fell within micro leakage scoring 1 &3 which indicated the extension of the dye only within the finish line area.

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