Repair bond strength of composite to Er,Cr:YSGG laser irradiated zirconia and porcelain surfaces

Abstract

Background Fracture or chipping are major concerning failures of an all-ceramic restoration. Repairing of the failure restoration using intra-oral technique is time saving and cost effective treatment modality. The present study was proposed to evaluate effect of Er,Cr:YSGG laser irradiation on shear bond strength between zirconia/porcelain and composite resin. Methods Thirty zirconia and thirty zirconia based porcelain disc shape specimens were prepared. Three different surface treatment procedure were applied the specimens. For control groups (Group ZC and PC), instruction manual of an intra-oral porcelain repair system was followed. Different pulse rates of Er,Cr:YSGG laser irradiation (short and long pulses) were applied to zirconia and porcelain surfaces for other groups (Group ZS, ZL, PS, and PL). Porcelain repair kit was used to repair specimens using standard cylindrical teflon mold (2 × 2 mm). Repair bond strength of the repaired specimens was tested using a universal testing machine. Results Highest mean bond strength value was observed at Group PC that was significantly higher than laser applied porcelain groups. Long pulse laser irradiation illustrated that increased mean bond strength compared to short pulse application on to the porcelain surface. Laser applied zirconia groups showed better mean bond strength than Group ZC, but differences between the groups were not statistically significant. Conclusion Different modes of Er,Cr:YSGG laser irradiation enhanced repair bond strength of the composite resin to zirconia, but these were not significant. Following the instruction manual for surface treatment on the porcelain surface was better method than Er,Cr:YSGG laser surface conditioning.

Shear Bond Strength of Composite Repair System to Bilayered Zirconia Using Different Surface Treatments (In Vitro Study)

“…Laser showed the statistically significantly lowest mean shear bond strength, which is in accordance with Saraç et al [15]. This can be explained as the porcelain has high content of silica 50-60% by weight and the action of Cojet increased the amount of silica by embedding silica coated aluminum oxide to the surface of the porcelain which resulted in high amount of chemically bondable silica that achieved high bond strength to the silane coupling agent and also can be attributed to the increase in surface area and roughness that resulted from the blasting action of silica coated aluminum oxide to the surface of porcelain which was considered by Saraç et al the "major" factor for a strong bond [17,19] In general the laser shear bond strength values were less in the porcelain sub groups than in zirconia sub groups and this can be explained in accordance to Sari et al [22] in his study that measured light transmission of Er:Yag laser through different ceramic materials and it was found that the light transmission of laser in monolithic zirconia is higher than in porcelain which means the energy of the laser is not absorbed in zirconia with the same degree in feldpsathic porcelain and as a result it will not affect the surface or change its topography as well as the feldpsathic porcelain surface [22][23][24][25][26][27][28].…”

Effect of Air-Abraded Versus Laser-Fused Fluorapatite Glass-Ceramics on Shear Bond Strength of Repair Materials to Zirconia

“…Zirconia-based restorations (ZBR) have been widely used in dentistry due to their superior mechanical properties and excellent aesthetics [1]. Zirconia has a fracture toughness of 7-19 MPa m 1/2 and flexural strength of 1200 MPa, therefore it could act as a durable framework for dental restorations [2]. ZBR has an opaque zirconia substructure which is traditionally veneered by tooth-coloured glass-ceramics [3].…”

Shear bond strengths of aged and non-aged CAD/CAM materials after different surface treatments

“… 16 17 18 It has also been determined that using erbium, chromium: yttrium-scandium-gallium-garnet (Er,Cr: YSGG) laser irradiation enhances the bond strength of restorative materials by creating micro-retentive areas. 19 20 …”