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Öğe Fracture load and microcrack comparison of crowns manufactured from tooth-shaped and traditional blocks(WILEY, 2021) Arslan, Merve; Tosun, İlgiThis study intended to analyze microcracks and fractographic markings on the surface of all ceramic crowns after milling and compare the fracture loads. 90 crowns were manufactured from two feldspathic (Priticrown-Pr and Vita Mark II-Vi) and a lithium disilicate (EmaxCAD-Em) blocks (n= 30). Two groups (n= 15) were prepared for each ceramic. In the first group, crowns were analyzed twice via the fluorescent penetrant method for microcrack detection, after the manufacturing process and thermal cycles. The load to fracture test was applied at a crosshead speed of 0.5 mm/min until catastrophic failure. Second group crowns were directly cemented onto the Co-Cr dies following the manufacturing process and loaded to fracture. Fractographic markings were analyzed through scanning electron microscope. Spearman correlation analysis, Kruskal-WallisHtest, Mann-WhitneyUtest, and Wilcoxon Signed Rank test were applied (alpha= .05). Fracture loads of Em crowns were higher than other groups (p <.05), with and without the aging procedure. Except for second group Pr (r= -.532), no significant relationship was found between microcrack numbers and fracture loads (p > .05). Thermal cycling did not affect microcrack numbers and fracture loads (p > .05). Tooth-shaped multilayered Pr blocks did not provide an advantage in terms of microcrack and fracture loads.Öğe Repair bond strength and surface topography of resin-ceramic and ceramic restorative blocks treated by laser and conventional surface treatments(WILEY, 2020) Bayraktar, Yusuf; Arslan, Merve; Demirtağ, ZülfikarThis study intended to compare the repair bond strength of computer-aided design/computer-aided manufacturing (CAD/CAM) blocks consisting of resin and feldspathic ceramics following different surface treatments using the microtensile bond strength (mu TBS) test. Ten specimens were prepared with 4 mm height for Vita Enamic (VE), Lava Ultimate (LU), Vita Mark II (VM), and thermocycled (10,000 cycle, 5-55 degrees C). Each material was categorized into one of five subgroups according to following surface treatments: (a) bur grinding (BG), (b) hydrofluoric acid etching (HF), (c) neodymium-doped yttrium aluminum garnet (Nd:YAG or NY), (d) erbium-doped yttrium aluminum garnet (Er:YAG or EY), and (e) erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er,Cr:YSGG or ECY) laser conditioning. After surface treatment procedures, specimens were properly restored to 4 mm high with a micro-hybrid composite resin. Bar specimens (1 x 1 x 8 mm) were obtained using a low-speed cutting machine and then thermocycled (10,000 cycle, 5-55 degrees C). The mu TBS was tested at 1 mm/min crosshead speed, and failure modes were evaluated. Data were analyzed with two-way ANOVA and post hoc Tukey tests. LU-BG showed significantly higher mu TBS (32.94 +/- 5.80 MPa) compared to LU-laser groups (p < .05). VE-BG showed significantly higher mu TBS (22.06 +/- 4.26 MPa) compared to other VE groups (p < .05). Among the laser groups, the NY laser produced the lowest (p < .05) mu TBS for LU (13.42 +/- 3.44 MPa) and VE (2.27 +/- 0.85 MPa), while EY showed the highest (p < .05). Laser-treated VM groups were all prefailured. VM-HF produced a higher mu TBS (18.73 +/- 3.75 MPa) than VM-BG (5.05 +/- 1.76 MPa) (p < .05).Öğe The evaluation of MTA and Biodentine as a pulpotomy materials for carious exposures in primary teeth(Springer Heidelberg, 2019) Celik, Burcu Nihan; Mutluay, Merve Safa; Arikan, Volkan; Sari, SaziyeObjectiveThis study examined the effects of MTA and Biodentine on the clinical and radiographic success rates of pulpotomies performed on primary teeth with carious pulp exposures.Materials and methodsThis study was conducted with 44 mandibular primary molars requiring vital pulpotomy. Carious dentin surrounding the exposure site was used as the inclusion criteria for all teeth, which were randomly divided into two groups according to pulpotomy material [MTA group (n=24), Biodentine group (n=20)]. Treatment was followed up clinically and radiologically for 24months. Pulp canal obliteration was not regarded as a failure.ResultsClinical and radiographic success rates at the end of 24months were 100% for the MTA group and 89.4% for the Biodentine group. Success rates did not vary significantly between the groups (p=0.646). Pulp canal obliteration was observed in two teeth (8.3%) in the MTA group at 6months, but the teeth were found to be stabilized by 24months.ConclusionThe long-term clinical and radiographic success rates obtained in this study indicate that both MTA and Biodentine are appropriate options for pulpotomy treatment of primary teeth with carious exposure in patients whose teeth should be retained for long periods of time.Clinical relevanceThe etiology of exposure determines pulpal response, making it crucial to distinguish between mechanical and carious exposures. The carious exposure is presumed to be accompanied by severe inflammation, which makes the prognosis of treatment unpredictable. Biomaterials can be used especially in cases with carious pulp exposures.Öğe Surface Roughness of Ceramic-Resin Composites After Femtosecond Laser Irradiation, Sandblasting or Acid Etching and Their Bond Strength With and Without Silanization to a Resin Cement(Operative Dentistry Inc, 2019) Demirtag, Z.; Culhaoglu, A. K.Objectives: The aim of this study was to investigate the effects of femtosecond laser irradiation, sandblasting, or acid etching treatments on the surface roughness of ceramic-resin composites and also shear bond strength (SBS) with and without silanization to a resin cement. Methods: Samples of Vita Enamic (VE; Vita Zahnfabrik, Bad Sackingen, Germany) and Lava Ultimate (LU; 3M ESPE, Seefeld, Germany) were classified into control (no treatment), sandblasting, hydrofluoric acid, and femtosecond laser groups (n= 30). Surface roughness was determined using two-dimensional contact profilometry. Surface topography was evaluated using a three-dimensional contact profilometer and a scanning electron microscope. Then groups were divided into two subgroups with similar surface roughness values, including control (C), control + silane (C-S), sandblasting (SB), sandblasting + silane (SB-S), hydrofluoric acid (HF), hydrofluoric acid + silane (HF-S), femtosecond laser (FS), and femtosecond laser + silane (FS-S) groups (n= 15). Panavia F 2.0 resin cement was applied to the sample surfaces using an SDI SBS rig (SDI Limited, Bayswater, Australia). The SBS test was performed after water storage (24 h, 37 degrees C) and thermocycles (2000 cycles, 5 degrees C to 55 degrees C), and failure modes were evaluated. Results: The highest surface roughness was observed in the FS group, and the highest SBS was observed in the FS-S group for both VE and LU (p<0.001). Silanization improved the SBS of VE significantly (p<0.001) in all surface treatments but did not improve that of LU except in the FS group (p=0.004). There was a significantly moderate negative correlation in the VE/SB group (p=0.012) and a moderate positive correlation in the VE/HF group (p=0.049). Conclusions: Femtosecond laser irradiation was found to be more effective than sandblasting or acid etching in increasing the surface roughness, and it was also the most effective surface treatment with silanization on the SBS of a resin cement to the ceramic-resin composites.Öğe Does Achievement of Hemostasis After Pulp Exposure Provide an Accurate Assessment of Pulp Inflammation?(Amer Acad Pediatric Dentistry, 2018) Mutluay, Merve; Arikan, Volkan; Sari, Saziye; Kisa, UclerPurpose: The purpose of this study was to determine in primary molars with carious exposures whether hemostasis at the exposure site and pulp orifice reflected inflammatory status of the pulp at the canal orifice based on cytokine levels. Methods: Forty mandibular primary molars with deep caries were included in the study. Teeth were divided into two groups: group A had teeth where hemostasis at the exposure site was achieved within five minutes, and group B had teeth where hemostasis at the exposure site could not be achieved within five minutes. Blood samples were harvested from the exposure sites and canal orifices. Cytokine levels for IL-1 beta, IL-2, IL-6, IL-8, IL-10, TNF-alpha, and PGE(2) were measured using ELISA for all sample sites. Results: The IL-6 levels at the exposure sites were found to be significantly higher in group A when compared to group B, but there was no statistically significant differences in any of the cytokine levels at the canal orifices between the two groups. Conclusions: Controlling bleeding at the exposure site or canal orifices does not provide accurate assessment of inflammation at the canal orifice and may be misleading for diagnosing vital pulp treatment in primary teeth with a carious pulp exposure.Öğe A Rare Case of "Double Teeth" in Permanent Dentition(2017) Mutluay, Merve Safa; S0nmez, Işıl Saroglu; Arıkan, VolkanFüzyon ve bigeminal dişler arasında kesin bir ayrım yapmak oldukça zordur. Bu sebeple, "İkiz diş" terimi füzyon, geminasyon gibi gelişimsel anomalileri tanımlamak için kullanılmaktadır. İkiz diş anomalisi; diş dizilimi ve ilişkilerini, ark simetrisini, görünümü ve periodontal dokuları et- kilemektedir. Dikkatli bir muayeneyi takiben, uygun bir tedavi planı ve düzenli kontrollerin yapıl- ması önemlidir. Bu makalede, alt daimi premolar dişte klinik olarak gözlemlenmeyen nadir bir ikiz diş anomalisi sunulmuştur. Sunulan olgu, sürekli dentisyonda klinik olarak gözlemlenmeyen ilk ikiz diş olgusudur. Gözlemlerimiz, dental anomalilerin teşhisinde dikkatli bir radyografik muaye- nenin önemini vurgulamaktadır.
