Laser-Milled Microslits Improve the Bonding Strength of Acrylic Resin to Zirconia Ceramics

Abstract

Heightened aesthetic considerations in modern dentistry have generated increased interest in metal-free “zirconia-supported dentures.” The lifespan of the denture is largely determined by the strength of adhesion between zirconia and the acrylic resin. Thus, the effect on shear bond strength (SBS) was investigated by using an acrylic resin on two types of zirconia ceramics with differently sized microslits. Micromechanical reticular retention was created on the zirconia surface as the novel treatment (microslits (MS)), and air-abrasion was used as the control (CON). All samples were primed prior to acrylic resin polymerization. After the resin was cured, the SBS was tested. The obtained data were analyzed by using multivariate analysis of variance(α = 0.05). After the SBS test, the interface failure modes were observed by scanning electron microscopy. The MS exhibited significantly higher bond strength after thermal cycles (p < 0.05) than the CON. Nevertheless, statistically comparisons resulted in no significant effect of the differently sized microslits on SBS (p > 0.05). Additionally, MS (before thermal cycles: 34.8 ± 3.6 to 35.7 ± 4.0 MPa; after thermal cycles: 26.9 ± 3.1 to 32.6 ± 3.3 MPa) demonstrated greater SBS and bonding durability than that of CON (before thermal cycles: 17.3 ± 4.7 to 17.9 ± 5.8 MPa; after thermal cycles: 1.0 ± 0.3 to 1.7 ± 1.1 MPa), confirming that the micromechanical retention with laser-milled microslits was effective at enhancing the bonding strength and durability of the acrylic resin and zirconia. Polycrystalline zirconia-based ceramics are a newly accessible material for improving removable prosthodontic treatment, as the bond strength with acrylic resin can be greatly enhanced by laser milling.

Bonding and Thermal Cycling Performances of Two (Poly)Aryl–Ether–Ketone (PAEKs) Materials to an Acrylic Denture Base Resin

“…Note that the superior flexible properties of PAEK materials would relate to the life span of the PAEK prosthesis (i.e., relative lower resistance to force). Peng et al [ 24 ] reported that the deformation was not significantly different to Co-Cr alloy after 15,000 cycles (equal to 5 years clinical usage) when adjusting the thickness or width of the framework. Hence, the PAEK framework successfully enhanced the bite force and fulfilled the long-term requirements.…”

“…In previous studies, scholars have tried to apply Y-TZP [ 22 ], Ce-TZP/A [ 23 ], and PEEK [ 24 ] to RPD clasps. The mechanical properties (i.e., fatigue, bending properties) of these materials were tested and the feasibility of applying them to a RPD framework was confirmed.…”

Metallization by Sputtering to Improve the Bond Strength between Zirconia Ceramics and Resin Cements

“…For clinical applications, the minimum required bonding strength is 10 MPa. A bonding strength greater than 20 MPa is desirable [ 10 , 11 , 12 , 13 ]. In this study, only the Ti sputtering group exhibited a bond strength of over 20 MPa.…”

“…According to Matsumura et al [ 10 ], 10–20 MPa is the minimum clinically acceptable bonding strength for crown prostheses. Moreover, surface pretreatment is required for dental adhesives to obtain sufficient adhesive bonding strength [ 11 , 12 , 13 ]. It is known that chemical bonding between resins and materials such as metals and ceramics can be achieved.…”

Effects of dimensions of laser-milled grid-like microslits on shear bond strength between porcelain or indirect composite resin and zirconia

“…Industrial lasers such as carbon dioxide (CO 2 ) [15], neodymium-doped yttrium aluminum garnet (Nd:YAG) [9,16,23,26,27], Er:YAG [9], and erbium chromium:yttrium scandium gallium garnet (Er,Cr:YSGG) [28] lasers have been used previously for the surface treatment on zirconia. It has also been reported that zirconia can be processed using a computer numerical control (CNC) neodymium-doped yttrium orthovanadate (Nd:YVO 4 ) laser [29,30].…”