Evaluation of Shear Bond Strength of High-Performance Polymers to Its Resin Veneering and to Dentin (In Vitro Study)

Abstract

INTRODUCTION: : Looking through the wide range of prosthetic options High-performance polymers properties. Needs over layering resin veneer, bonded by a special adhesive, this adds an additional challenge to achieve adequate bond strength, also its bonding to tooth structure remains difficult. OBJECTIVES: To evaluate shear bond strength of CAD/CAM High-performance polymers (BioHPP) with its CAD/CAM veneering composite using two different adhesives, as well as to dentin using two types of cements. MATERIALS AND METHODS: This in vitro study, for Group I, twenty BioHPP discs with their CAD/CAM veneering composite, were milled and divided randomly into two subgroups (n =10) according to the adhesive system used. Subgroup IA: using DTK adhesive (dualhardening adhesive). Subgroup IB: using Combo.lign (dual-hardening adhesive). For Group II, twenty CAD/CAM High-performance polymers (BioHPP) discs were milled and divided into two subgroups according to the different cements used to lute to dentin surface. Subgroup IIA: using: RelyX Unicem resin cement, subgroup IIB: using Fuji Plus GI cement. After water storage, thermocycling (1200 cycles, 5°C/55°C) corresponding to one year of clinical service, all the specimens were subjected to shear force until failure and the results in the various groups were compared and statistically analyzed. Modes of failure were assessed. RESULTS: Mean SBS were as follows: subgroup IA (DTK adhesive 6.238), subgroup IB (combo.lign2.42), subgroup IIA (RelyX Unicem 2.07) and subgroup IIB (Fuji Plus 3.77). Mann-Whitney test demonstrated significant differences between the two subgroups in groups I and II (U= 2.0, P=.001) (U=17, P=.013) respectively. Stereomicroscope revealed that mixed and adhesive failure were the most dominant mode of failure. CONCLUSIONS MDP-Containing Self-adhesive Resin (DTK adhesive) is recommended as efficient adhesive to increase the shear bond strength of the veneering composite to BioHPP. Also Fuji Plus showed better bond strength than RelyX Unicem with BioHPP and dentin.

Effect of different fabrication materials and techniques on the retention of implant meso-structures to Ti-base abutments

“…91,96,97 Moreover, the DTK adhesive resin cement was selected in this study due to its ability to enhance chemical bond between adhesive and PEEK as it is MDP-based dual cure adhesive resin cement. 95 The failure mode revealed for PEEK CAD was type 2 which suggests the adequate bond between the treated PEEK surface the cement used (Fig. 9).…”

“…[92][93][94] It has been assumed that adhesives containing methylmethacrylate (MMA) and pentaerythritolacrylate (PEITA) along with extra dimethacrylate increased bond strength significantly, as MMA triggered the PEEK surface to swell while dimethacrylate monomers allowed the connection to composite resin through two binding sites represented as carboxyl groups. 42,43,87,95 Many previous studies revealed high bond strength values after the use of Visio.Link on various pretreated PEEK surface. 91,96,97 Moreover, the DTK adhesive resin cement was selected in this study due to its ability to enhance chemical bond between adhesive and PEEK as it is MDP-based dual cure adhesive resin cement.…”

A Potential Application of Materials Based on a Polymer and CAD/CAM Composite Resins in Prosthetic Dentistry

“…PEEK is a tooth-colored material [21] with high purity and elasticity (Young`s elastic modulus is about 3-4 GPa), similar to those of human bone [23]. It is radiolucent, non-corrosive, non-toxic, non-allergenic, and stable to heat and sterilization.…”

“…It is radiolucent, non-corrosive, non-toxic, non-allergenic, and stable to heat and sterilization. It is resistant to hydrolysis and shows good biocompatibility [23]. Another thing that is also important for its application in implant technology is its low water sorption rate and small solubility.…”

“…Same is true for water absorption where the PEEK (6.5 μg/mm 3 ) [15] absorbed <50% less water than resins (10.6-18.8 μg/mm 3 ) [24,25]. Also, flexural strength about 170.37±19.31 MPa [26] and high modulus of elasticity of 3-4 GPa [23] may alleviate the possibility of the material from breaking, and give it a consistency similar to the bone [27].…”