![]() 15 The results regarding the efficacy of these techniques have been controversial and inconclusive. 7, 9- 14 The commonly used surface treatments include air abrasion, silica coating, acid etching and plasma treatment to enhance surface wetting and bond strength. 8, 10 Previous studies have indicated that surface treatment is imperative to achieve a strong bond between PEEK and composite resin. Thus, they may be applicable to PEEK as well. 9 These strategies are commonly used for metal and ceramic veneers. 6- 8 Therefore, since a durable bond is imperative for the long-term service and durability of restorations, several methods such as chemical adhesion, mechanical retention or a combination of both have been suggested to enhance the bond. PEEK has low surface energy and high resistance to chemical surface treatments because the aromatic chemical structure of ketone and other constituents of PEEK create an inert surface with suboptimal bonding capabilities. Thus, a layer of composite resin should be applied over it, which may compromise achieving a strong bond between the composite resin and PEEK. ![]() 5 However, PEEK has such a shortcoming as its optical properties including low translucency and gray color, limiting its application for monolithic restorations. 4 Thus, it has several dental applications in dental implants, implant abutments, removable dentures, and fixed partial dentures. 3 PEEK also has favorable dimensional stability at high temperatures (melting temperature >300☌), high chemical and mechanical resistance to wear and high tensile strength, fatigue resistance, and flexural strength. 2 Its advantages include natural appearance resembling that of natural teeth (compared to metal), an easy shaping ability by dental burs, lower cost than gold, lower weight compared to ceramics and titanium, easy use, optimal biocompatibility, low plaque accumulation, and elasticity properties similar to those of bone, enamel and dentin, which make it suitable for use as a restorative material. 1 PEEK is a tooth-color synthetic polymer from the polyaryletherketone family and is a new type of high-temperature thermoplastic polymer with an aromatic molecular chain and functional ketone and ether groups attached to each other. However, due to some shortcomings, new generations of dental composites have been introduced to the market, including polyaryletherketone, polyether ether ketone (PEEK), polyetherketoneketone, and PEEK/polyetherketoneketone reinforced with mineral fillers, which have optimal wear properties. The Dunnett’s test showed that both Er:YAG and CO2 laser groups yielded higher SBS than the control group ( P<0.001).Ĭonclusion: The Er:YAG and CO2 laser treatments can increase the SBS of PEEK to composite resin veneers, although the Er:YAG laser seems to be more effective for this purpose.Ĭomposite materials fabricated by the computer-aided design/computer-aided manufacturing techniques have shown promising results when used for dental restorations. The Tukey HSD test revealed that the Er:YAG laser had higher SBS than the CO2 laser group ( P<0.001). Results: The SBS of the 3 groups was significantly different ( P<0.001). The SBS was then measured and the data were analyzed using one-way ANOVA, Tukey HSD test and Dunnett’s test at 0.05 level of significance. The bonding agent and PEEK opaque were applied on the surface of samples and they were veneered with a composite resin using a hollow plastic cylinder with an internal diameter of 4 mm. The samples were then randomly divided into 3 groups (n=20) of control, Er:YAG laser surface treatment (Power=1.5 W, energy density=119.42 J/cm 2, irradiation time=20 s) and CO2 laser surface treatment (Power=4 W, energy density=159.22 J/cm 2, irradiation time=50 s). The samples were mounted in auto-polymerizing acrylic resin in such a way that only one surface measuring 7x7 mm remained exposed. Methods: In this experimental study, 60 rectangular-shaped PEEK samples (7 x 7 x 2 mm) were used. ![]() This study aimed to assess the effect of surface treatment with erbium-doped yttrium aluminum garnet (Er:YAG) and carbon dioxide (CO2) lasers on shear bond strength (SBS) of PEEK to composite resin veneers. There is a gap of information regarding the efficacy of laser irradiation in the surface treatment of PEEK, and the efficacy of several laser types needs to be evaluated for this purpose. ![]() Therefore, different surface treatments such as laser conditioning should be investigated. Introduction: Polyether ether ketone (PEEK) has low surface energy and high resistance to chemical surface treatments. ![]()
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