Ismail Ozkocak

This in vitro study evaluated the effect of hexagonal boron nitride (HBN) nanoparticles on the push-out bond strength of a bioceramic root canal sealer. Sixty-eight extracted human maxillary central incisors were prepared using Reciproc R40 instruments and assigned to four groups: Adseal, unmodified BioRoot RCS, and BioRoot RCS containing 5% or 20% HBN by volume. Following obturation with gutta-percha and the respective sealers, specimens were stored at 37 °C and 100% humidity for 14 days. One-millimeter-thick slices from the coronal, middle, and apical thirds underwent push-out testing. Data were analyzed using a linear mixed-effects model, with sealer type, root region, and their interaction as fixed effects and tooth identity as a random effect (p < 0.05). BioRoot RCS containing 20% HBN showed significantly higher bond strength than Adseal in the coronal region, no significant difference in the middle region, and significantly lower bond strength in the apical region. Unmodified BioRoot RCS showed the lowest bond strength in all regions. Regional variations differed according to sealer type. Within the limitations of this study, incorporating 20% HBN increased the push-out bond strength of BioRoot RCS. Further investigation of the physicochemical, biological, and long-term properties of HBN-modified sealers is required.

Aim: In this study, we aimed to evaluate the effects of four different photoactive dyes on the dentin adhesion of an epoxy resin-based root canal sealer.Methods: Sixty maxillary central incisors were used. Root canals were prepared up to the size Reciproc #40, and 2.5 mL of 5% NaOCl was used between each file. The teeth were divided into six groups: Group 1, distilled water (the control group); Group 2, methylene blue; Group 3, toluidine blue; Group 4, indocyanine green; Group 5, Congo red; and Group 6, diode laser. After final irrigation, each canal was irrigated with 2.5 mL of photoactive dye. Laser irradiation was applied for 1 min (940 nm wavelength, continuous mode, 1W). The canals were obturated with epoxy resin-based sealer and gutta-percha. Sections measuring 2 mm in thickness were taken from the apical, middle, and coronal thirds of the roots for the push-out test.Results: Although the photoactive dyes caused a decrease in the sealer bond strength values, there was no statistically significant difference from the control group or between the dyes. Diode laser irradiation increased bond strength, but there was again no significant difference. Bond strength values decreased from the coronal to the apical region (5.89±1.19, 3.93±0.76, and 3.18±0.63 MPa, respectively).Conclusion: We observed that the use of photoactive dyes to support root canal disinfection had no negative effect on the bond strength of a resin-based sealer.

Aim: Calcium silicate-based fillings have been widely used in surgical endodontic treatment because of hard-tissue conductive and inductive properties. The aim of present study is to investigate the bond strength of different calcium silicate-based fillings in retrograde cavities. Methods: Forty-four maxillary single rooted teeth were endodontically treated. The apical portions of the teeth were removed and root-end cavities were prepared using an ultrasonic tip. The roots were randomly divided into four experimental groups (n = 11) according to the material used; (1) MTA-FILLAPEX, (2) MTA Repair HP, (3) MTA-FILLAPEX+ MTA Repair HP, and (4) MTA Plus. Two horizontal cross sections (1±0.1 mm thick) from each specimen were resected from the apices. These sections were placed in a universal testing machine to evaluate the push-out bond strength force required for dislodgement of the root end filling was recorded. The failure type was also evaluated by using a stereomicroscope. The differences in bond strength were analyzed using the two-way analysis of variance (ANOVA). Results: MTA-FILLAPEX and MTA Plus displayed the lowest and highest dislocation resistance, respectively (P < 0.05). In the apical level, bond strength was significantly higher than the coronal level in all groups except for MTA-FILLAPEX. Mixed failure was prevalent in all groups, except for MTA-FILLAPEX, which showed purely cohesive failures. Conclusions: Investigated calcium silicate-based filling materials showed different bond strength to the root-end cavity. The bond strength was significantly decreased when the prior application of MTA-FILLAPEX before delivery of MTA Repair HP.

Instrument fracture is a procedural mishap thatprevents efficient cleaning and shaping of the root canal. When bypassing thefracture fails, the fragment must be removed. Many techniques and devices havebeen described to remove fragments from the root canal. The Masserann Kit is awidely used instrument for the removal of fragments. These clinical casesdescribe use of the Masserann Kit to remove separated instruments blocking theentire canal in posterior teeth.

En tr Objective : The purpose of this study was to evaluate the effects of different environment temperatures and irrigation solution temperatures on the calcium hydroxide (CH) removal efficacy of XP-Endo Finisher from root canal irregularities. Materials and Method : Eighty-three teeth were instrumented and split longitudinally. Two standard grooves (apical and coronal) were prepared, and the roots were randomly divided into five experimental groups (n=15), a positive control group (n=4), and a negative control group (n=4). The grooves were filled with CH, the root halves were re-assembled; the canal space was also filled with CH, and the teeth were stored for 14 days. Fourteen days later, CH was removed using one of the following irrigation protocols, where environmental temperature for Groups 1-4 and Group 5 were 37 °C and 21 °C, respectively: Group 1: Conventional needle irrigation with NaOCl at 21 °C; Group 2: Conventional needle irrigation with NaOCl at 37 °C; Group 3: XP-Endo Finisher with NaOCl at 21 °C; Group 4: XP-Endo Finisher with NaOCl at 37 °C; Group 5: XP-Endo Finisher with NaOCl at 21 °C. The amount of remaining CH after removal was examined and scored by using a stereomicroscope. The statistical evaluation was performed using Kruskal–Wallis and Mann–Whitney U tests with Bonferroni-correction. Results : Group 3 and 4 removed significantly more CH than the other groups in the apical region (p0.05). The removal of CH was not affected by the irrigation solution temperature (p>0.05); but was significantly affected by the environmental temperature (Group 3 versus Group 5; pversus Groups 1 and 2; p0.05) ancak çevre sıcaklığından (Grup 3’e karşı Grup 5; p<0.05) ve KH uzaklaştırma tekniğinden (Grup 3 ve 4’e karşı Grup 1 ve 2; p<0.05) önemli derecede etkilendi. Sonuç NaOCl solüsyonunun sıcaklığı XP-Endo Finisher’ın KH kaldırma etkinliğinde önemli bir rol oynamazken, çevre sıcaklığı etkinliğini arttırdı.