Manikya Arabolu¹, K Chandrasekharan Nair²*, Vahini Reddy³, Divya Hegde⁴ and Jayakar Shetty⁵

¹Clinical Specialist, South India, 3M Oral Care Solutions Division, Bangalore, India
²Professor Emeritus, Department of Prosthodontics, Sri Sankara Dental College, Akathumuri, Thiruvananthapuram, Kerala, India
³Former Professor, Department of Prosthodontics, AECS Maaruti College of Dental Sciences, Bangalore, India
⁴Professor and Head of the Department of Prosthodontics, Bangalore Institute of Dental Science, Bangalore, India
⁵Former Professor and Principal, AECS Maaruti College of Dental Sciences, Bangalore, India

*Corresponding Author: K Chandrasekharan Nair, Professor Emeritus, Department of Prosthodontics, Sri Sankara Dental College, Akathumuri, Thiruvananthapuram, Kerala, India.

Received: January 10, 2023; Published: January 26, 2023

Abstract

Purpose of the study: In vivo repair of fractured ceramic restorations with composite resin is a viable alternative to total replacement of the restoration and there is a need to find out the bond strength between the ceramic and composite resin to obtain a clinically acceptable restoration.

Objectives: To find out and compare

• The bond strength obtained with different types of ceramics viz. conventional feldspathic ceramic, heat pressed ceramic and ceramic used in CAD-CAM technology.
• The effectiveness of two etchants viz. acidulated phosphate fluoride (APF) gel (1.23%) and hydrofluoric acid (HF) (9.6%) in providing adequate bond strength of composite resins to fractured ceramic restorations.
• The role of two types of micro hybrid composites viz. Filtek and Fulfil on the bond strength with different ceramics.

Materials and Methods: Twelve Nickel chromium alloy discs of size 12mm x 1.5mm were casted and feldspathic ceramic was built up on them. Twelve discs were made in pressable ceramic and twelve discs were milled using CAD/CAM technology. All the specimens were embedded in acrylic resin blocks. Half the specimens were treated with HF (9.6%) and the remaining half was treated with APF gel (1.23%). The specimens were further treated with silane coupling agent followed by bonding agent and composite resin cylinders with 3mm diameter and 2mm height were built up on them. They were subjected to shear bond strength testing with Universal testing machine following which the specimens were viewed under a scanning electron microscope to ascertain the mode of failure.

Results: The results proved that IPS Empress pressable ceramics provided a higher shear bond strength (SBS) when compared to CAD-CAM ceramics. Metal Ceramics yielded the lowest SBS. Ceramics can be considered as a significant factor influencing the SBS. 9.6% HF etchant was found to give a higher mean SBS when compared to 1.23% APF Gel. Etchant also can be considered as a significant factor that influence the SBS. Even though Filtek Resin recorded a higher mean SBS when compared to Fulfil Universal, the difference between them was not statistically significant. Resins cannot be considered as a significant factor that has an influence on SBS. Higher SBS was found in the combination of CAD-CAM ceramic and etchant 9.6% HF. Either of the resins can be used as there is no significant difference between them. The specimens where HF was used as the etchant, the failure was cohesive in nature irrespective of the resins used. With APF, majority of failures were adhesive in nature.

Conclusions: The type of ceramic and the etchants are significant factors in providing adequate bond strength between the composite resins and fractured ceramic restorations. The two resins provided almost similar bonding characteristics.

Keywords: Dental Ceramics; Ceramic Fracture; Ceramic Repair; Composite Resin; Shear Bond Strength

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Citation

Citation: K Chandrasekharan Nair., et al. “Bond Strength of Composite Resins used in the Repair of all Ceramic and Metal Ceramic Crowns - An In vitro Study".Acta Scientific Dental Sciences 7.2 (2023): 205-307.

Copyright

Copyright: © 2023 K Chandrasekharan Nair., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.