Erhan Özcan

A comparative evaluation of sealing ability of a new, self-etching, dual-curable sealer: Hybrid Root SEAL (MetaSEAL)

OBJECTIVE To assess the long-term sealing ability of a new dual-curable, self-etching, 4-META containing resin-based sealer: Hybrid Root SEAL (MetaSEAL in the United States) and compare with RealSeal and AH Plus sealers. METHODOLOGY Root canals of 44 extracted and decoronated single-rooted human teeth were instrumented using a crown-down technique with ProFile 0.04 tapered NiTi rotary instruments to ISO size 30 and then to size 45 with K-hand files. Four roots were selected and used as positive and negative controls (n = 2), the rest were randomly divided into 4 groups (n = 10) and filled using 0.04 tapered size 45 cones as follows: Group 1: AH Plus with gutta-percha; Group 2: Hybrid Root SEAL (MetaSEAL) with gutta-percha; Group 3: Hybrid Root SEAL (MetaSEAL) with Resilon point; and Group 4: RealSeal with Resilon point. The quality of seal of each specimen was measured after 1, 4, 12, and 24 weeks using a fluid transport model. Measurements were made at 2-minute intervals for 8 minutes. The data were calculated as Lp and statistically analyzed using 2-way repeated measures of ANOVA and Bonferroni pairwise comparison tests (alpha = 0.05). RESULTS There were no significant differences among test materials in terms of fluid microleakage values (P = .126). There were statistically significant differences among the time periods (P = .009) and observed between 1- and 24-week test periods. There was significant interaction between root canal filling materials and time of testing (P = .048). CONCLUSION Within the limitations of this in vitro study, it was concluded that recently introduced Hybrid Root SEAL (MetaSEAL) showed similar sealing performance with RealSeal and AH Plus sealers when used either with gutta-percha or Resilon at 24 weeks.

The effect of luting cement thicknesses on the push-out bond strength of the fiber posts

Abstract Objective. The aim of this study was to evaluate the effect of luting cement thicknesses on the push-out bond strength of the fiber posts. Materials and methods. Sixty human maxillary canine teeth were endodontically treated. Post spaces were prepared and root specimens randomly divided into three groups: Group 1: etch-and-rinse (Variolink II/Exite DSC), Group 2: self-etch (Panavia F2.0/ED primer) and Group 3: self-adhesive (Clearfil SA Cement). Then each group was divided into four sub-groups according to the cement thickness, as follows: Sub-group 1: 0.35 mm, Sub-group 2: 0.25 mm, Sub-group 3: 0.15 mm, and Sub-group 4: 0.05 mm. Three slices of 1 mm thickness were obtained from each root specimen (n = 15). Push-out tests were performed and data was analyzed with two-way ANOVA and Tukey tests. Results. The etch-and-rinse system (Variolink II) had a significantly higher bond strength compared with the other systems ( p < 0.05). The thickest cement group (0.35 mm) had a significantly lower bond strength compared with the 0.15 and 0.05 mm groups in the etch-and-rinse and self-adhesive groups (p < 0.05). In the self-etch group, the cement thicknesses did not significantly affect the bond strength (p > 0.05). Conclusions. The etch-and-rinse system offered better bonding to root dentine than the self-adhesive and self-etch systems. The increases in cement thickness significantly reduced the bond strength of fiber posts to root dentine for both the etch-and-rinse and self-adhesive systems.

A case report: Unusual anatomy of maxillary second molar with 3 mesiobuccal canals.

Understanding root canal morphology is one of the most important steps in successful root canal treatment. Thus, during the diagnosis and treatment phases of the maxillary molars, a clinician must be aware that anatomical variations exist. A number of studies, especially in vitro, have investigated various root canal morphologies, including aberrations of maxillary molars. This clinical case report highlights an unusual variant of a maxillary second molar with a third mesiobuccal canal.

Assessment of the sealing abilities of several root canal sealers and filling methods

Abstract Objective. To evaluate the sealing abilities of two root canal sealers (epoxy resin-based AH Plus® and polydimethylsiloxane-based GuttaFlow®) and of five root filling techniques (lateral condensation, matched taper single gutta-percha point, laterally condensed-matched taper gutta-percha point, Thermafil® and continuous wave of condensation), using a bacterial leakage model. Materials and methods. One hundred and seventy-four single-rooted human teeth were randomly divided into 10 test groups (n = 15) and two control groups (n = 12). The roots that were filled with the test material, using the different root filling techniques, were mounted in a two-chamber bacterial leakage model and Enterococcus faecalis was added to the upper chambers. The lower chambers of all of the specimens were checked every day during the test period (100 days). The day of turbidity was recorded for each sample. Statistical analysis was performed using the Kaplan-Meier and log-rank tests. Results. There was no significant difference between the epoxy resin-based and the polydimethylsiloxane-based sealers, irrespective of the filling techniques used (p > 0.05). The continuous wave of condensation technique was found to be superior to the other techniques (p < 0.05). The difference between the other groups was insignificant (p > 0.05). Conclusions. AH Plus and GuttaFlow sealers showed similar levels of sealing ability. The continuous wave of condensation technique had the best sealing capability when compared to the other techniques.

Antifungal activity of several root canal sealers against Candida albicans

Abstract Objective. The purpose of this in vitro study was to evaluate the antifungal activity of several root canal sealers (iRoot SP, MTA Fillapex and GuttaFlow) against Candida albicans and compare them to that of AH Plus Jet. Materials and methods. A 10 μL fungi in suspension was allowed to directly contact the sealers, which were freshly mixed or allowed to set for 1 or 7 days. Fresh media was then added and survival of fungi was determined by using 10-fold serial dilution and inoculated onto agar plates. After incubation for 48 h, colony-forming units (CFU) were calculated and their log10 values converted. The data were analyzed using ANOVA and Tukey tests (α = 0.05). Results. Freshly mixed AH Plus Jet totally inhibited the growth of fungi and showed the highest antifungal activity. GuttaFlow did not show any significant antifungal activity at all times. Freshly mixed iRoot SP and MTA Fillapex were found to be antifungal. Statistical differences were found between freshly mixed and set samples (p < 0.05) in favor of the former, except GuttaFlow. No statistically significant differences were found among the tested sealers at the 1 and 7-day samples (p > 0.05). Conclusions. Fresh AH Plus Jet had very potent antifungal activity. All sealers, except GuttaFlow, exhibited antifungal activity when freshly mixed.

The effect of a diode laser and traditional irrigants on the bond strength of self-adhesive cement

PURPOSE The purpose of this study was to compare the effect of a diode laser and traditional irrigants on the bond strength of self-adhesive cement. MATERIALS AND METHODS Fifty-five incisors extracted due to periodontal problems were used. All teeth were instrumented using a set of rotary root canal instruments. The post spaces were enlarged for a No.14 (diameter, 1.4 mm) Snowlight (Abrasive technology, OH, USA) glass fiber reinforced composite post with matching drill. The teeth were randomly divided into 5 experimental groups of 11 teeth each. The post spaces were treated with the followings: Group 1: 5 mL 0.9% physiological saline; Group 2: 5 mL 5.25% sodium hypochlorite; Group 3: 5 mL 17% ethylene diamine tetra acetic acid (EDTA), Group 4: 37% orthophosphoric acid and Group 5: Photodynamic diode laser irradiation for 1 minute after application of light-active dye solution. Snowlight posts were luted with self-adhesive resin cement. Each root was sectioned perpendicular to its long axis to create 1 mm thick specimens. The push-out bond strength test method was used to measure bond strength. One tooth from each group was processed for scanning electron microscopic analysis. RESULTS Bond strength values were as follow: Group 1 = 4.15 MPa; Group 2 = 3.00 MPa; Group 3 = 4.45 MPa; Group 4 = 6.96 MPa; and Group 5 = 8.93 MPa. These values were analysed using one-way ANOVA and Tukey honestly significant difference test (P<.05). Significantly higher bond strength values were obtained with the diode laser and orthophosphoric acid (P<.05). There were no differences found between the other groups (P>.05). CONCLUSION Orthophosphoric acid and EDTA were more effective methods for removing the smear layer than the diode laser. However, the diode laser and orthophosphoric acid were more effective at the cement dentin interface than the EDTA, Therefore, modifying the smear layer may be more effective when a self-adhesive system is used.

Travma geçirmiş anterior dişlerde gelişen kök kırıklarında restoratif

Ozet: Amac: Travma sonucu meydana gelen kok kiriklari agri, fonksiyon kaybi ve kotu estetigin yani sira hastada psikolojik sorunlara da yol acabilmesi itibariyle hizli bir sekilde tedavi edilmesi gereken bir sorundur. Kirigin lokalizasyonuna gore farkli tedavi stratejileri gelistirilebilir. Olgu: Bu vaka raporunda ust cene lateral kesici dislerin koronal uclusunde gelisen horizontal kiriklarin tedavisinde kron parcalarinin polietilen fiber post ve kompozit ile koke yapistirilmasi ve ust cene santral kesici disin apikal uclusunde gelisen kok kirigi sebebiyle cekilmesi sonrasinda hastadaki dis eksikliginin fiber ile guclendirilmis adeziv kopru ile gecici olarak restore edilmesi anlatildi. Sonuc: 12 ay sonrasinda vakalarda yapilan radyolojik ve klinik kontroller vakalarin iyi bir stabilizasyona, estetige ve periodontal sagliga sahip oldugunu gosterdi.

Air Flow İle Yapılan Parlatmanın Porselen Ve Kompozitlerin Yüzey Pürüzlülüğü Üzerine Etkisi

Air Flow Ile Yapilan Parlatmanin Porselen Ve Kompozitlerin Yuzey Puruzlulugu Uzerine Etkisi

Farklı sodyum perborat tiplerinin endodontik olarak tedavi edilmiş ve kompozit ile restore edilmiş dişlerin kırılma direnci üzerine etkisi

Amac: Bu calismanin amaci endodontik olarak tedavi edilmis premolar dislerin, farkli sodyum perborat (SP) tipleri ile intrakoronal agartma tedavisinden sonra kirilma direncinin degerlendirilmesidir.Gerec ve Yontem: Bu calismada 80 adet cekilmis insan premolar disi kullanildi. Guta perka ve bir kok kanal dolgu pati ile kok kanallarinin doldurulmasini takiben, kok kanal dolgusu uzerine labial mine-sement birlesiminin 2 mm apikalinde, 2 mm kalinliginda bir kaide materyali yerlestirildi. Disler her biri 10 adet dis icerecek sekilde rasgele olarak 8 gruba ayrildi. Agartma ajanlari dislerin pulpa odalarina 3-7 gun icin yerlestirildi ve giris kaviteleri Cavit ile kapatildi: Grup 1:SP monohidrat (MH) + su, Grup 2: SP trihidrat (TRH) + su, Grup 3: SP tetrahidrat (TH) + su, Grup 4: SP-MH + hidrojen peroksit (HP), Grup 5: SP-TRH + HP, Grup 6: SP-TH + HP, Grup 7: HP, Grup 8: su. Agartma tedavisinden sonra disler kompozit ile restore edildi ve otopolimerizan akrilige gomuldu. Daha sonra disler universal test cihazinda test edildi.Bulgular: Su ile karistirilan sodyum perborat tipleri, hidrojen peroksit ile karistirilanlar ile kiyaslandiginda daha yuksek kirilma direnci gosterdi.Sonuc: Bu calismanin sonuclari; farkli sodyum perborat tiplerinin intrakoronal agartma tedavisinden sonra endodontik olarak tedavi edilen premolar dislerin kirilma direnci uzerinde bir etkiye sahip oldugunu gosterdi