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Öğe The effect of calcium silicate-based sealer on the push-out bond strength of fibre posts(WILEY, 2012) Ozcan, E.; Capar, I. D.; Cetin, A. R.; Tuncdemir, A. R.; Aydinbelge, H. A.Background: The aim of this study was to assess the effect of the iRoot SP root canal sealer on the push-out bond strength of fibre posts cemented with self-adhesive resin cement. Methods: Forty-eight extracted maxillary incisors were randomly divided into four groups according to the tested sealer (n = 12): group 1 control (only gutta-percha points, no sealer); group 2 AH Plus Jet (resin-based sealer); group 3 Endofill (zinc oxide-eugenol-based sealer); and group 4 iRoot SP (calcium silicate-based sealer). All root canals were filled with gutta-percha, and groups 24 additionally received one of the sealers. Fibre posts were cemented with the self-adhesive resin cement Clearfil SA Cement. The specimens were sectioned in the coronal, middle and apical regions, producing three slices of 1 mm thickness. The push-out test was performed. All data were submitted to ANOVA and Tukey tests (a = 0.05). Results: No statistically significant differences were found between the control group, AH Plus Jet and iRoot SP (p > 0.05). The Endofill sealer showed significantly lower bond strength compared to the other sealers and the control group (p < 0.05). Conclusions: The calcium silicate-based sealer did not adversely affect the bond strength of the fibre posts cemented with self-adhesive resin cement.Öğe The effect of different restoration techniques on the fracture resistance of endodontically-treated molars(OPERATIVE DENTISTRY INC, 2008) Cobankara, F. K.; Unlu, N.; Cetin, A. R.; Ozkan, H. B.Aim: This study compared the fracture resistance of endodontically-treated mandibular molars with mesio-occluso-distal (MOD) cavities restored using different restoration techniques. Methodology: Sixty sound extracted mandibular molars were randomly assigned to six groups (n=10). Group 1 did not receive any preparation. The teeth in Groups 2-6 received root canal treatment and a MOD cavity preparation. The teeth in Group 2 were kept unrestored. Group 3 was restored conventionally with amalgam. Group 4 was restored with a dentin bonding system (DBS, Clearfil SE Bond) and resin composite (CR) (Clearfil Photoposterior). Group 5 was restored with indirect hybrid ceramic inlay material (Estenia). In Group 6, polyethylene ribbon fiber (Ribbond) was inserted into cavities in a buccal-to-lingual direction and the teeth were then restored with DBS and CR. After finishing and polishing, the specimens, except for Group 2, were loaded to failure by a chewing simulation device (60,000 cycles x 50 N load, 1.3 Hz frequency) in an artificial environment at 37 degrees C. Each tooth was subjected to compressive loading perpendicular to the occlusal surface at a crosshead speed of 1 mm/minute. The mean loads necessary to fracture were recorded in Newtons and the results were statistically analyzed. Results: The mean fracture values were as follows: Group 1: 2485.3 +/- 193.9(a), Group 2: 533.9 +/- 59.4(b), Group 3: 1705.8 +/- 135.7(c), Group 4: 2033.3 +/- 137.6(cd), Group 5: 2121.3 +/- 156.5(d), Group 6: 1908.9 +/- 132.2(cd). There were statistically significant differences between the groups annotated with different letters. Thus, Group 1 (intact teeth) had the greatest fracture resistance and Group 2 (non-restored teeth) the poorest. No statistically significant differences were found between Groups 3 (amalgam), 4 (resin composite) and 6 (polyethylene ribbon fiber reinforced composite) (p>0.05). Group 5 (indirect hybrid ceramic inlay) had greater fracture resistance than Group 3 (p<0.05). Conclusions: Within the limitations of this study, although all of the restoration groups were stronger than the prepared-only group, none of the restoration techniques tested was able to completely restore the fracture resistance lost from MOD cavity preparation. However, use of indirect hybrid inlay restorations in these teeth may be recommended, because this restoration technique indicated more favorable fracture failure modes than other restoration techniques used in this study and particularly greater fracture strength than amalgam restorations. The promising result of indirect hybrid inlay restorations may need to be confirmed by long-term clinical studies.Öğe A Five-Year Clinical Evaluation of Direct Nanofilled and Indirect Composite Resin Restorations in Posterior Teeth(OPERATIVE DENTISTRY INC, 2013) Cetin, A. R.; Unlu, N.; Cobanoglu, N.Aim: To assess the clinical efficacy of posterior composite resin restorations placed directly and indirectly in posterior teeth after five years. Materials and Methods: A total of 108 cavities in 54 patients were restored with three direct composite resins (Filtek SupremeXT [FSXT], Tetric Evo Ceram [TEC], AELITE Aesthetic [AA]) and two indirect composite resins (Estenia [E] and Tescera ATL [TATL]). All restorations were evaluated by two examiners using the United States Public Health Service criteria at baseline and five years after placement. Statistical analysis was completed with Fisher exact and McNemar chi(2) tests. Results: At baseline, 4% (five) of the restored teeth presented postoperative sensitivity; however, only one of them (a member of the E group) required canal treatment and replacement after two years. At the five-year evaluation, all restorations were retained, with Alpha ratings at 100%. Only one tooth (in the TEC group) required replacement after three years due to secondary caries. Color match, surface texture, and marginal integrity were predominantly scored as Alpha after five years for all groups. After that time, marginal discoloration was scored as Alpha in 64% of AE restorations, 70% of TATL restorations, 73% of E restorations, and 87% of FSXT restorations. There were no Charlie scores recorded for any of the restorative systems. Conclusions: Under controlled clinical conditions, indirect composite resin inlays and direct composite resin restorations exhibited an annual failure rate of 2.5% and 1.6%, respectively, after five years. Therefore, the investigated materials showed acceptable clinical performance, and no significant differences were found among them.
