Factors affecting the bond strength of denture base and reline acrylic resins to base metal materials

Abstract

Corresponding address: Naomi Tanoue -Division of Fixed Prosthodontics -Nagasaki University Hospital, 1-7-1 -Sakamoto Nagasaki -852-8501 -Japan -Phone: +81-95-819-7688 -Fax: +95-819-7689 -e-mail: t-naomi@nagasaki-u.ac.jp 6XEPLWWHG -DQXDU\ 0RGL¿FDWLRQ $SULO $FFHSWHG 0D\O bjective: The shear bond strengths of two hard chairside reline resin materials and an auto-polymerizing denture base resin material to cast Ti and a Co-Cr alloy treated using four conditioning methods were investigated. Material and Methods: Disk specimens (diameter 10 mm and thickness 2.5 mm) were cast from pure Ti and Co-Cr DOOR\ 7KH VSHFLPHQV ZHUH ZHWJURXQG WR D ¿QDO VXUIDFH ¿QLVK RI JULW DLUGULHG DQG treated with the following bonding systems: 1) air-abraded with 50-70-μm grain alumina (CON); 2) 1) + conditioned with a primer, including an acidic phosphonoacetate monomer (MHPA); 3) 1) + conditioned with a primer including a diphosphate monomer (MDP); 4) treated with a tribochemical system. Three resin materials were applied to each metal specimen. Shear bond strengths were determined before and after 10,000 thermocycles. Results: The strengths decreased after thermocycling for all combinations. Among the UHVLQ PDWHULDOV DVVHVVHG WKH GHQWXUH EDVH PDWHULDO VKRZHG VLJQL¿FDQWO\ S JUHDWHU shear bond strengths than the two reline materials, except for the CON condition. After 10,000 thermocycles, the bond strengths of two reline materials decreased to less than 10 MPa for both metals. The bond strengths of the denture base material with MDP were VXI¿FLHQW 03D IRU FDVW 7L DQG IRU &R&U DOOR\ &RQFOXVLRQ %RQGLQJ RI UHOLQH UHVLQ PDWHULDOV WR PHWDOV DVVHVVHG ZDV FOLQLFDOO\ LQVXI¿FLHQW UHJDUGOHVV RI PHWDO W\SH surface treatment, and resin composition. For the relining of metal denture frameworks, a denture base material should be used.

Effect of nonthermal plasma treatment on surface chemistry of commercially-pure titanium and shear bond strength to autopolymerizing acrylic resin

“…In this study, thermocycling was used to verify the quality and durability of the tested surface treatments. Artificial aging allows the water penetration at the resin-metal interface [3,8,9] and also induces stress in the acrylic resins [4], which decreases the bond strength. The physical and the chemical alterations created by sandblasting and/or the NTP treatment might be one of the factors that are responsible for the higher bond strength results in the Po + NTP, SB and SB + NTP groups.…”

“…In vitro studies show that acrylic resins have poor bonding to metal alloys [3,[6][7][8][9][10]. Failure at the metal-resin interface may lead to significant clinical complications [3,7,10].…”

“…The use of autopolymerizing acrylic resins is considered to be an economical and non-time-consuming method for performing repairs of dentures with PMMA-based materials as superstructures [6,9,10]. However, the resin-metal interface may not be durable because the strength of this chemical bonding decreases (≈60%) in the short-term [6].…”

Allergic effects of the residual monomer used in denture base acrylic resins

“…[ 7 ] Acrylic based soft and the hard relining process is very useful in removable prosthodontics which helps in improving denture's retention, stability, and support. [ 8 ] Soft reliners are also useful for recording neutral zone impressions of completely edentulous arches. [ 9 10 ] The use of acrylic resins for copings in restorative dentistry has also been described, however, this use in modern dentistry is not widely documented.…”

Bond Strength of Reline Resins to Aged-simulated Denture Base Acrylic Resin

“…1,13,21 Thermocycling was used as an accelerated aging test to evaluate the influence of time over the materials, and the results after thermocycling might be more significant when considering the situation of a removable denture in the oral cavity. 23 Also, the constantly ingestion of hot and cold liquids and food lead to variations inside the mouth. 7, 2 1 The heat stress may increase water sorption because of an extension of the distance between the polymer chains, reducing mechanical properties of the materials, and the wet environment may cause degradation of the denture polymers.…”