Effect of Adhesive Primer Developed Exclusively for Heat-curing Resin on Adhesive Strength between Plastic Artificial Tooth and Acrylic Denture Base Resin

Abstract

Despite progress in the development of denture base resin and artificial tooth materials, dental clinics are still plagued with artificial teeth falling off the denture base -due to poor bond strength -after denture delivery. Against this background, this study sought to examine the effect and durability of an adhesive primer developed exclusively for heat-curing resin on the adhesive strength of heat-curing denture base acrylic resin to plastic artificial tooth. Test specimens were divided into four groups according to the treatment method of the artificial tooth's test bonding surface: air abrasion, adhesive primer application, adhesive primer application after air abrasion, and pretreatment only（control） . After heat curing of acrylic resin onto the bonding surface, shear test was performed for two storage periods: 24-hour versus 100-day water storage. From the results obtained, it was revealed that the evaluated adhesive primer was significantly effective in increasing adhesive strength between artificial tooth and acrylic resin, although specimens were stored in water for 100 days.

Bonding of acrylic denture teeth to MMA/PMMA and light-curing denture base materials: The role of conditioning liquids

“…In turn, crack initiation and propagation at the interface are likely to occur, which may affect the bond strength between denture teeth and denture base resins. 14,15,27,28,41,44 5000 cycles between 5 and 55 8C were selected, as this has been developed a standard procedure for artificial ageing. It has to be mentioned, however, that no studies have adequately shown a correlation of the number of thermocycles to months or years of clinical service.…”

“…22 In contrast, other authors used shear, compressive or peel tests to assess the bond strength between denture teeth and denture base resins. 10,11,23,[38][39][40][41][42][43][44][45][46][47] It is speculated that, under clinical conditions, the force direction leading to debonding of denture teeth is a combination of tensile and shear forces. This can, however, hardly be simulated 1:1 in an in vitro experiment.…”

“…41 Marra et al reported a significant decrease of bond strength between Versyo.com and denture teeth, depending on the type of teeth used. 12 The results are partially in accordance and partially in contradiction with literature.…”

“…13 The latter is mostly a combination of mechanical and chemical pre-treatment to obtain a durable bond. 41,49 Hence, the teeth were ground using 150 grit abrasive paper to simulate cutting of the bonding surface with a medium to rough carbide bur. 22,49,50 Gross-mechanical retentions were applied only for Eclipse, as a specific conditioning liquid is not available in Germany (K.D.…”

The Effect of Different Chemical Surface Treatments of Denture Teeth on Shear Bond Strength: A Comparative Study

“…Recently, the application of non-polymerizing solvents like dichloromethane, chloroform and adhesive bonding agent seem to enhance the bond strength between denture base resin and acrylic resin teeth [8][9][10][11][12][13]. Adeyemi et al, [12] stated that the chemical bonding between teeth and the polymer-monomer dough occurs through absorption of monomer by the surface layers of teeth.…”