Pengaruh Surface Treatment dan Thermocycling terhadap Kekuatan Lekat Geser Framework Gigi Tiruan Polyetheretherketone dan Sadel Resin Akrilik Polimerisasi Panas

Abstract

The components of RPD are the denture base/connector, retainer, saddle and artificial teeth. Denture bases are generally made from metals such as cobalt chromium/Co-Cr or from thermosetting polymers such as polymethyl methacrylate (PMMA) or better known as acrylic resin. Due to the lower cost, RPD with hot polymerized acrylic resin is widely used, but acrylic has low fracture resistance. To overcome the liability of previous material, cobalt-chromium/Co-Cr is generally used as the metal framework with its excellent mechanical properties. One of the limitations of metal frames is the inescapable appearance of metal clasps, which makes it less aesthetically pleasing. Like most patients, elderly patients with edentulus are partially aesthetically conscious and seek treatment that not only rehabilitates oral function, but also enhances esthetics. Polyetheretherketone is a linear polycyclic aromatic semicrystalline thermoplastic polymer obtained from the union of ketone and ether functional groups between aryl rings. PEEK has a density, coefficient of elasticity and compressive strength similar to that of human hard tissue, which makes it a suitable choice for denture dentures. PEEK is an inert material, makes it difficult to bond to others dental material. Surface modification of PEEK is one of the main focuses prior to its clinical application. The aim of this study is to examine the effect of surface treatment and thermocycling on the shear bond strength of PEEK frameworks and PMMA saddles. The CAD/CAM technique was used for the manufacture of PEEK samples in this study so that the dimensions of the samples were accurate and precise. The PEEK material used contains 5 Wt% titanium oxide (TiO2) nanoparticle filler for better mechanical resistance. Thirty pieces of PEEK samples with a size of 10 x 10 mm and a thickness of 3 mm were made according to ISO 29022, then divide into groups based on the type of surface treatment (chemical, mechanical and combined). Disc-shaped wax with a diameter of 5 mm and a thickness of 3 mm the 3 groups with a total of 30 samples were then placed in centre of the PEEK sample. Flasking, dewaxing and packing of heat polymerized acrylic resin were carried out by mixing powder and liquid with a ratio of 3:1 and put in waterbath according to the manufacturer's directions. Then each group of samples was further divided into two groups: without thermocycling and with 5000 cycles thermocycling to simulate 5 years denture usage. Shear bond strength test was then carried out. From the test result, the combination surface treatment group without thermocycling gave the highest shear bond strength, the shear bond strength value of the chemical surface treatment group with thermocycling had the lowest shear bond value. Failure mode of PEEK with heat polymerized acrylic resin in all thermocycling groups was adhesive failure type and only 6.7 % cohesive failure in the total number of samples. The clinical implication of this study is that PEEK can be used as a potential alternative material for a more aesthetically pleasing GTSL framework. The use of a combination of sandblasting using 110 μm Al2O3 particles with a pressure of 0.4 MPa (4 Bar) and visio.link priming material is the most optimal surface treatment method for PEEK framework bonding to hot polymerized acrylic resin saddles and can be recommended for long-term clinical applications.