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    Effect of Boric Acid Versus Conventional Irrigation Solutions on the Bond Strength Between Fiber Post and Root Dentin
    (Quintessence Publishing Co Inc, 2017) Culhaoglu, Ahmet Kursad; Ozcan, Erdal; Kilicarslan, Mehmet Ali; Seker, Emre
    Purpose: To compare the effect of boric acid solutions of different percentages to conventional irrigation solutions on the adhesive bond strength between fiber posts and radicular dentin surface with different cement types. Materials and Methods: One hundred fifteen extracted human incisors were endodontically instrumented to a length of 14-15 mm, and 12-mm post spaces were prepared with specific drills. Cylindrical fiber posts (Panavia Post) were luted with two different composite cements (Panavia F 2.0, Panavia SA) and cut into 1-mm-thick slices. These specimens were randomly allocated to 5 groups according to the irrigant applied: 1. control, no irrigant; 2. 10 ml of 2% chlorhexidine; 3. 10 ml of 5.25% NaOCl for 5 min and 10 ml of 17% EDTA for 3 min; 4. 10 ml of 5% boric acid solution at a temperature of 55 degrees C for 60 s; 5. 10% boric acid solution, conditions as in group 4. Bond strength was determined using the push-out test. Microscopic assessment and SEM evaluations were performed in combination with push-out tests. Results: The push-out bond strengths of cervical segments were significantly higher than for the middle and apical segments in all groups. The type of irrigation solution used significantly affected the bond strengths of the posts. The 10% boric acid solution and EDTA + NaOCl irrigation solutions provided the highest bond strengths (p < 0.005). SEM analysis showed that the dentin tubules were open and the smear layer was completely removed when EDTA/NaOCl and 10% boric acid were used as irrigation agents. Conclusion: Boric acid solutions, especially at a concentration of 10%, can be a viable alternative to the conventional irrigants used during endodontic treatment. The extent to which the 10% boric acid solution successfully removed the smear layer and the ease of rinsing boric acid from the root surface are advantageous.
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    Effect of Various Treatment Modalities on Surface Characteristics and Shear Bond Strengths of Polyetheretherketone-Based Core Materials
    (WILEY, 2020) Culhaoglu, Ahmet Kursat; Ozkir, Serhat Emre; Sahin, Volkan; Yilmaz, Burak; Kilicarslan, Mehmet Ali
    Purpose To investigate the effect of different surface treatments on the surface roughness (Ra), wettability, and shear bond strength of polyetheretherketone (PEEK) to composite resin. Materials and Methods One hundred ninety eight PEEK specimens were divided into six groups (n = 33). Specimen surfaces were treated with the following surface treatment modalities: silicoating (CoJet), acetone treatment, acid etching (H2SO4), airborne particle abrasion (Al2O3), laser irradiation (Yb:PL laser), and the nontreated surface serving as the control. Surface roughness was measured with an profilometer (n = 11) and a goniometer was used to measure the surface wettability through contact angle (theta)(n = 11). PEEK surfaces were veneered with a composite resin (n = 11). The specimens were then thermocycled for 10,000 cycles at 5 to 55 degrees C. Shear bond strengths between the PEEK and composite resin were measured with an universal test machine. One-way ANOVA was used to analyze the data. Tukey's post-hoc test was used to determine significant differences between groups (alpha = 0.05). Results Surface roughness and wettability of PEEK surfaces along with shear bond strength of PEEK to composite resin were influenced by the surface treatments. (p < 0.01) Highest mean Ra values were obtained for PEEK surfaces treated by laser irradiation (2.85 +/- 0.2 mu m) followed by airborne particle abrasion (2.26 +/- 0.33 mu m), whereas other surface treatment modalities provided similar Ra values, with the acid-etched PEEK surfaces having the lowest mean Ra values (0.35 +/- 0.14 mu m). Silicoating provided the most wettable PEEK surfaces (48.04 +/- 6.28o), followed by either acetone treatment (70.19 +/- 4.49o) or acid treatment (76.07 +/- 6.61o). Decreased wettability was observed for airborne particle abraded (84.83 +/- 4.56o) and laser-treated PEEK surfaces (103.06 +/- 4.88o). The highest mean shear bond strength values were observed for acid-etched PEEK surfaces (15.82 +/- 4.23 MPa) followed by laser irradiated (11.46 +/- 1.97 MPa), airborne particle abraded (10.81 +/- 3.06 MPa), and silicoated PEEK surfaces (8.07 +/- 2.54 MPa). Acetone-treated (5.98 +/- 1.54 MPa) and untreated PEEK surfaces (5.09 +/- 2.14 MPa) provided the lowest mean shear bond strengths. Conclusions The highest mean shear bond strengths were observed for acid-etched PEEK surfaces, followed by laser-irradiated, airborne particle abraded, and silicoated PEEK surfaces providing similar mean shear bond strengths. Since shear bond strengths higher than 10 MPa are considered acceptable, acid etching, laser irradiation, and airborne particle abrasion of PEEK surfaces may be considered viable surface treatment modalities for the PEEK material tested.
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    Semi-Supervised Method for Determining the Maxillary and Mandibular Boundaries on Panoramic Radiographs
    (Ieee, 2018) Ulku, Berkay Kagan; Yetik, Imam Samil; Culhaoglu, Ahmet Kursad; Orhan, Kaan; Kilicarslan, Mehmet Ali
    X-ray imaging plays an important role in the detection and diagnosis of dental disorders that can not be detected with the eye. Examination, evaluation and accurate diagnosis of panoramic radiography images used in anomaly detection is a process requiring serious experience and expertise. In order to simplify this process and to increase accuracy, some studies have been carried out on both the imaging techniques and the development of the computer aided diagnosis systems by transferring these images to the digital medium. One of these studies is segmentation of various structures in dental X-ray images. In this study, instead of using random masks as initial inputs, we developed a special mask identification method for each image and gave the mask which is the output of this method as initial input to the segmentation algorithm to obtain more suitable elliptical forms closer to the actual(ground truth) results and to the maxillary and mandibular structures.