Odporność na przecieki bakteryjne czterech środków łączących używanych do cementowania koron
Resistance against bacterial leakage of four luting agents used for cementation of complete cast crowns
Inadequate marginal fit of complete cast metal or ceramic crowns, porcelain fused to metal restorations and inlays/onlays is one of the most important shortcomings that can affect the wash-out of a luting agent resulting in bacterial penetration between restoration and dentin, thus increasing the risk of recurrent caries and pulp inflammation, which in turn may compromise the durability of a restoration (1). As demonstrated by Piwowarczyk et al (2) the choice of an appropriate cementing agent may be a determining factor concerning the degree of microleakage. Zinc phosphate cement has historically been the cement of choice for cementation of indirect cast restorations. The phosphoric acid and zinc oxide react ionically to form a low pH amorphous mass. However, the cement does not bond to dentin and due to its solubility, chemical dissolution occurs leading to higher microleakage scores than other cements (3, 4). In order to overcome this problem, glass-ionomer cements, resinmodified glass ionomer cements and resin composite cements were developed in recent last decades (5). More recently, new improved self-adhesive resin-based or resin-modified glassionomer cements were introduced and are currently being used by the dental profession. Resin-based luting cements can penetrate into the dentin tubules and exposed collagen network and bond to dentin through micro-mechanical interlocking (6). Resinmodified glass-ionomer cements are hybrid formulas and composed of fluoroaluminosilicate glasses, polyacrylic acid and resin composites [...]
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