Comparison of Bond Strength of Acrylic, Composite, and Nanocomposite Artificial Teeth to Heat-Cure Acrylic Denture Base Resin

Abstract

Objectives:The present study aimed to evaluate the bond strength of heat-cure denture base resin to newly designed Iranian artificial acrylic teeth.Materials and Methods:In this in-vitro experimental study, shear bond strengths of Ivoclar acrylic, Apple composite, and B-Star nanocomposite teeth to heat-cure acrylic denture base resin were compared. A total of 18 samples were selected from each group of teeth. The samples were attached to heat-cure resin according to ISO 10477 standard. For the assessment of bond strength, the samples were placed in a universal testing machine and were subjected to shear forces at a speed of 1 mm/minute to record the fracture load. Descriptive statistics, including frequency, mean, and standard deviation, were calculated using SPSS 20 software. Two-way analysis of variance was used to compare the shear bond strength of the groups with and without monomers and the studied artificial teeth.Results:The mean shear bond strengths of Ivoclar acrylic teeth were 392.22±23.76 MPa and 337.11±32.18 MPa with and without adding monomers to the tooth surface, respectively. The mean shear bond strengths were 250.44±29.84 MPa and 238.33±27.28 MPa (without monomers) and 438.33±24.16 MPa and 311.56±32.78 MPa (with monomers) for Apple composite and B-Star nanocomposite artificial teeth, respectively.Conclusion:The greatest shear bond strength was attributed to Ivoclar acrylic teeth followed by Apple composite and B-Star nanocomposite artificial teeth. Addition of monomers to the tooth surface significantly strengthened the shear bonding of acrylic base resin to the teeth.

The Shear Bond Strength between Milled Denture Base Materials and Artificial Teeth: A Systematic Review

“…Considering the fact that debonding can occur between denture base resins and an artificial tooth for different reasons, shear bond strength values should be as high as possible [ 29 ]. Generally, the shear bond strength test is standardly used for investigating the bond strength between denture base resin and artificial tooth resin [ 4 , 29 , 45 , 48 , 49 , 50 ]. Apart from the shear bond strength testing, some other testing procedures are available.…”

Bond strength of acrylic denture tooth to a novel thermo-polymerized denture base copolymer containing cycloaliphatic comonomer after mechanical and thermal aging

“…[ 5 ] Factors affecting this bond include improper wax elimination from the ridge lap area of the teeth, impetuous application of the separating medium, monomer deficiency during processing, polymerization method employed, water sorption, coefficient of thermal expansion mismatch of teeth and base material, and porosity on the junction of denture base and teeth. [ 6 7 8 ] The physical and chemical properties of artificial teeth are effective in strengthening the bond to denture base resins. [ 1 9 ] On the other hand, this bond is affected by the physical and chemical properties of acrylic base resins,[ 10 11 12 ] polymerization temperature,[ 9 ] and the method of artificial tooth preparation.…”