Effect of different metal surface treatments on microleakage of the two types of acrylic resin: Heat cure and light cure at Co/Cr interface

S. Al-Ameer, Shatha; A. Farhan, Firas

	Effect of different metal surface treatments on microleakage of the two types of acrylic resin: Heat cure and light cure at Co/Cr interface
Journal of baghdad college of dentistry
Article 1, Volume 21, Issue 3, 2009, Pages 31-36
Authors
Shatha S. Al-Ameer; Firas A. Farhan
Abstract
ABSTRACTBackground: The microleakage (M.L) at the metal-resin interface in a removable partial denture may results indiscoloration, fluid percolation, and acrylic resin deterioration. Enhancing resistance to microleakage at this interfacemay improve the long-term union between the two materials (alloy and acrylic resin). The aim of this study was todetermine the effect of various metal surface treatments on microleakage and bonding between the metal alloyand acrylic resin used in the fabrication of a removable partial denture.Materials and Methods: Sixty rectangular Co/Cr samples (50 mm x 25 mm x 1 mm) were prepared and they had agrid pattern, which formed 50 squares which then divided into 2 groups according to the type of acrylic resinreceived each one 30 samples {A- for heat cure resin (HCR), B- for visible light cure resin (VLCR)} which weresubdivided according to the type of surface treatments into 3 subgroups each one 10 samples (A1 B1 for AirAbrasion -- A2 B2 for Metal Prime II (MP II) application -- A3 B3 for combination of Air Abrasion and Metal Primer IIapplication). Each sample was divided into experimental half (treated) and a control half (untreated). The sampleswere thermocycled (3000 cycles, 5 °C to 50 °C with a dwell time of 1 minute) after application of resin, and placed insodium fluorescein (0.2 g / 1000 mL) dye solution (Uranine dye, BDH chemicals Ltd Poole, England) for 48 hours. If thepenetration of the dye was not more than half of the square it was recorded half square and if it was more than halfit was recorded as one square.Results: The results showed that the subgroup that received Air Abrasion + Metal Primer II surface treatments for bothtypes of resins HC and VLC (A3 and B3) had the least M.L values, followed by the Air Abrasion subgroup (A1 and B1).Subgroups that received Metal Primer II alone (A2 and B2) showed the highest M.L value than the other subgroups.All Co/Cr samples with VLCR showed less dye penetration than that of HCR whether with surface treatment orwithout suggesting higher binding of resin with the Co/Cr surface.Conclusion: A combination of air abrasion and MP II for light cure samples showed the highest reduction in M.Lcompared to all other types of surface treatments and to HCR. MP II alone was less effective in reduction of M.L thanother surface treatments. The use of VLCR with different metal surface treatments revealed greater reduction in M.Lthan that when used HCR even when there is no surface treatment.Keywords: Co/Cr- heat and light cure resin interface, metal surface treatments, microleakage. (J Bagh Coll Dentistry2009; 21(4):31-36)

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