Odporność na przecieki bakteryjne czterech środków łączących używanych do cementowania koron
Discussion
In the present study, an in vitro method was used to analyze the penetration of bacteria at the margins of cast gold crowns luted with ABC, FC2 and EWB. A ZPC was used as control because it has been used by the dental profession for many years as the luting material of choice for gold crowns and inlays and because its physicochemical characteristics are well known (3-5). Controversy exists in the literature whether or not in vitro and in vivo microleakage testing correlate and if results from the former experiments can be correlated with the clinical situation (13). In clinical practice other factors such as material biocompatibility, ease of use and specific requirements for each individual case (e.g. height of residual tooth structure, preparation angle and location of the preparation margins) may influence the choice of a cement (13).
E. faecalis was chosen because they exist in the normal oral flora in humans and are frequently found in mixed infections with other aerobes and facultative anaerobes (14). Some aspects of our protocol need to be considered. For evaluation, a qualitative approach (presence or absence of turbidity) during a 60-day period was used to detect the presence of bacteria in the lower chamber. Although this observation period was similar to what has been frequently used in endodontic research (15, 16) it should be emphasized that 60 days is still a short period considering [...]
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