Effect of argon plasma on repair bond strength using nanofilled and microhybrid composites

Abstract

Objectives To evaluate the effect of atmospheric pressure plasma (PLA), sandblasting (SAN), silanization (SIL) and hydrophobic bonding resin (HBR) on the micro‐shear bond strength (MSBS) of fresh nanofilled (NF) or microhybrid (MH) composites to water‐aged nanofilled composite. Materials and methods NF plates were fabricated and stored in distilled water for 4 months. The aged plates were assigned to the groups (n = 6): 1‐ untreated; 2‐ SAN + SIL + HBR; 3‐ HBR; 4‐ PLA + HBR; 5‐ SAN + HBR; 6‐ SAN + PLA + HBR; and 7‐ PLA. Two fresh composite cylinders were constructed on each plate with NF or MH composites and tested after 24 h or 1 year of water‐storage, using the MSBS testing. Data were analyzed by three‐way ANOVA and Tukey test (α = 0.05). Results NF yielded better outcomes than MH at 24 h, which was not observed at 1 year. HBR showed the highest MSBS results, while untreated and PLA groups yielded the lowest one. MSBS reduced for all groups after 1 year. Conclusions Only HBR can obtain good MSBS results, while PLA alone was not beneficial. After 1 year, a reduction in repair MSBS was observed and the type of composite did not influence the results. Clinical relevance The repair technique can be simplified with the use of only an adhesive and macromechanical retentions in the old composite, regardless the type of fresh composite.

Which surface treatment improves the long-term repair bond strength of aged methacrylate-based composite resin restorations? A systematic review and network meta-analysis

“…The sample sizes varied between 5 [43] to 61[30] in each study. The aging methods included liquid storage (water [3, 9, 27, 44, 45] and saliva [46]), thermocycling [20, 22-25, 29, 31, 32, 42, 47], or a combination of the two [21, 26, 28, 30, 43, 48]. Seven studies [22-25, 30, 43, 46] provided micro-tensile bond strength, four [3, 9, 44, 47] indicated micro-shear bond strength, ten [20, 21, 26-29, 31, 32, 42, 48] gave shear bond strength, and only one [45] evaluated tensile bond strength.…”

“…Composite resin restorations must be repaired or replaced, over different time periods following placement due to secondary caries, cracks, marginal discoloration, gaps, cosmetic improvements, shape corrections, and proximal contact closures [1][2][3].…”

“…The surface treatment protocols performed on old composite resins also play a significant role in determining the durability of the repair bond. Invitro research findings had also utilized a variety of surface treatment methods, such as roughening with abrasive papers [20][21][22][23], diamond burs [24][25][26], Al 2 O 3 particles [3,22,27], silica coated particles [28][29][30], and lasers [31,32] as mechanical; and numerous bonding mechanisms, adhesives, and salinization as chemical surface treatments [3,22,23,27], solely or in combination to overcome the bonding obstacles. The main objective of such surface modifications is to produce a strong bond through the micromechanical interlocking between fresh and old composite resins.…”

Effect of Different Surface Treatments on the Long-Term Repair Bond Strength of Aged Methacrylate-Based Resin Composite Restorations: A Systematic Review and Network Meta-analysis

“…Resin composite restorations must be repaired or replaced, over different time periods following placement due to secondary caries, cracks, marginal discoloration, gaps, cosmetic improvements, shape corrections, and proximal contact closures [1][2][3]. Based on the extent of the damage and the seriousness of the defect, repair may be a viable option to replacement.…”

“…The surface treatment protocols performed on old resin composites also play a significant role in determining the durability of the repair bond. In vitro research findings had also utilized a variety of surface treatment methods, such as roughening with abrasive papers [20][21][22][23], diamond burs [24][25][26], Al 2 O 3 particles [3,22,27], silica-coated particles [28][29][30], and lasers [31,32] as mechanical, and numerous bonding mechanisms, adhesives, and silanization as chemical surface treatments [3,22,23,27], solely or in combination to overcome the bonding obstacles. The main objective of such surface modifications is to produce a strong bond through the micromechanical interlocking between fresh and old resin composites.…”