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    Evaluation of pH and calcium ion release of Acroseal sealer in comparison with Apexit and Sealapex sealers
    (MOSBY-ELSEVIER, 2007) Eldeniz, Ayce Unverdi; Erdemir, Ali; Kurtoglu, Firuze; Esener, Timur
    Objective. This is an in vitro assessment of pH level and calcium ion release exhibited by 3 calcium hydroxide-based root canal sealers-Sealapex, Apexit, and Acroseal. Study design. The materials were prepared according to the manufacturers' instructions and placed in 1 cm long and 4 mm diameter tubes. The tubes were then immersed in a glass flask containing 10 mL bidistilled water (n = 15), which was sealed and stored at 37 degrees C before the materials had set. The control group contained bidistilled water with empty tubes (n = 12). At predetermined time intervals (24 h, 96 h, and 7, 15, and 28 days) the pH of the bidistilled water was tested with a pH meter and for released calcium by using spectrophotometry. The data were statistically analyzed using 1-way analysis of variance for the comparison of the materials at each time point. If the difference was significant, individual comparisons were performed by Tukey multiple comparisons test (alpha = .05). Results. Sealapex produced higher pH and released significantly higher calcium amounts than the other 2 sealers at all periods (P < .05). Apexit showed higher calcium release than Acroseal at the end of 15 days (P < .05). There was no significant difference in the pH between Apexit and Acroseal (P > .05). Conclusion. The new Acroseal sealer presented the least calcium ion release and pH than Sealapex and less calcium ion release than Apexit sealer.
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    The Investigation of Biocompatibility and Apical Microleakage of Tricalcium Phosphate Based Root Canal Sealers
    (WILLIAMS & WILKINS, 1997) Bilginer, Suzan; Esener, Timur; Söylemezoğlu, Figen; Tiftik, Ali Muhtar
    The biocompatibility and apical microleakage of tricalcium phosphate based Sankin Apatite (SA) Type I, II, and III root canal sealers were investigated, Teflon tubes containing freshly mixed test materials were implanted in the subcutaneous tissue of mice, The observation periods were 24 h, 7, and 30 days, after which the areas of tissue reaction to the implanted materials were histopathologically analyzed, A dye-recovery, spectrophotometric method was used to evaluate apical microleakage. Results showed that the severity of tissue reaction among the tested materials decreased with time and at the end of the observation period both SA Type II and Type III were found more biocompatible than either Type I or Grossman's cement (GC), On the other hand, a fibrous tissue capsule was seen around the implants, There was no significant difference in spectrophotometrically measured leakage among teeth obturated with the test materials.