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    Bond strength of two total-etching bonding systems on caries-affected and sound primary teeth dentin
    (WILEY, 2008) Tosun, Gul; Koyuturk, Alp Erdin; Sener, Yagmur; Sengun, Abdulkadir
    Aim. As bond strength of currently available adhesive systems in caries-affected teeth dentin on primary tooth dentin was not well known, the bond strength of two bonding systems (PQI and OptiBond Solo Plus) was evaluated on caries-affected and sound primary molar tooth dentin and observed the micromorphology of the adhesive-dentin interfaces. Methods. By grinding both the sound (n = 30) and caries-affected (n = 30) approximal surfaces of teeth, flat dentin surfaces were obtained. The prepared surfaces were bonded with one of the each adhesive systems and a composite resin. After storing the bonded specimens in water at 37 degrees C for 24 h, the samples were sectioned and the bond strength of the adhesive systems was tested by the microshear test method. The data were statistically analysed. Results. Microshear bond strengths of PQI group for caries-affected and sound primary tooth dentin were 9.43 +/- 2.44 (MPa) and 9.32 +/- 2.95 (MPa) (P > 0.05), respectively, and the bond strengths of OptiBond Solo Plus group for caries-affected and sound primary tooth dentin were 15.33 +/- 3.59 (MPa) and 11.96 +/- 2.30 (MPa) (P < 0.05), respectively. Micromorphological features between sound and caries-affected dentin were similar in both PQI and OptiBond Solo Plus groups. Conclusion. Both the adhesives showed significantly different bond strengths in caries-affected dentin but showed similar bond strengths in sound dentin.
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    Conventional and high intensity halogen light effects on water sorption and microhardness of orthodontic adhesives
    (E H ANGLE EDUCATION RESEARCH FOUNDATION, INC, 2008) Uysal, Tancan; Basciftci, Faruk Ayhan; Sener, Yagmur; Botsali, Murat Selim; Demir, Abdullah
    Objective: To test the null hypothesis that when the equivalent total light energy is irradiated to three orthodontic adhesive resins, there is no difference between the microhardness and water sorption values regardless of the curing light sources. Materials and Methods: Samples were divided into six groups according to the combination of three orthodontic adhesives (Kurasper F, Light-Bond, Transbond XT) and two light intensities (quartz tungsten halogen [QTH] and high intensity quartz tungsten halogen [HQTH]). One half of each of the 40 samples of three adhesive pastes was polymerized for 20 seconds by a QTH light source, and the other half was polymerized for 10 seconds by a HQTH light source. Water sorption was determined and Vickers hardness was established with three measurements per sample at the top, center, and bottom. Statistical analysis was performed using two-way analysis of variance (ANOVA) with multiple comparisons (Tukey-HSD). Results: Statistically significant differences were found among all adhesives for water sorption and hardness values cured with QTH and HQTH. The HQTH curing unit resulted in higher values than did the QTH. The highest water sorption values were observed for Kurasper F cured with HQTH and the lowest value was observed for Transbond XT cured with QTH. For microhardness Light-Bond cured with HQTH produced the highest values, and Transbond XT cured with QTH produced the lowest. Conclusions: When the equivalent total light energy is irradiated to three orthodontic adhesive resins, there are significant differences between the microhardness and water sorption values cured with the QTH and HQTH light source. The null hypothesis is rejected.
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    Effect of different surface treatments on the shear and microtensile bond strength of resin-modified glass ionomer cement to dentin
    (TAYLOR & FRANCIS LTD, 2014) Altunsoy, Mustafa; Botsali, Murat Selim; Korkut, Emre; Kucukyilmaz, Ebru; Sener, Yagmur
    Objective. The aim of this study was to evaluate the effect of different surface treatments on the microtensile bond strength (mTBS) and shear bond strength (SBS) of resin-modified glass ionomer cement (RMGIC) to dentin. Materials and methods. Fifty-two extracted human molars were flattened to obtain dentin surfaces. For SBS assessment 40 teeth were divided into four groups according to their surface treatments (acid etching, Er: YAG laser QSP mode, Er: YAG laser MSP mode and control-SiC) (n = 10). A plastic cylinder was placed over the differently treated dentin surfaces and RMGIC was placed into the rings and polymerized. Twelve teeth were used for the mu TBS test. The treated dentin surfaces described above were restored with 4 mm high RMGIC and light cured; then, the specimens were sectioned into serial sticks (n = 15) and mu TBS and SBS were tested for failure in a testing machine with a 1 mm/min crosshead speed. The data were analyzed by one-way ANOVA and Tukey HSD tests (alpha = 0.05). Results. Acid etching showed significantly higher SBS than the other groups (p < 0.05). Er: YAG QSP and MSP-treated groups showed higher SBS values than the control group, but the difference was not statistically significant (p > 0.05). Er: YAG MSP showed the highest mu TBS value followed by acid etching, whereas the control group exhibited the lowest value (p < 0.05) and the differences between the control group and Er: YAG QSP were not significant (p > 0.05). Conclusions. The application of Er: YAG MSP mode and acid etching to dentin can be used for improving the bond strength of RMGIC.
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    Effect of storage duration/solution on microshear bond strength of composite to enamel
    (JAPANESE SOC DENTAL MATERIALS DEVICES, 2007) Tosun, Gul; Sener, Yagmur; Sengun, Abdulkadir
    The aim of this study was to determine the effect of three storage solutions and two storage durations on microshear bond strength (mu SBS) of a resin composite. Sixty non-carious human permanent molars were stored in three storage solutions (0.1% thymol, 10% formalin, and distilled water). Each tooth was separated mesio-distally into two parts. Specimens of the first part were stored for 24 hours, while specimens of the second part were stored for two months in the solutions. After each storage period, the enamel surface was covered with a composite resin in combination with an etch-rinse adhesive system. Specimens were then serially sectioned into sticks of I mm(2) bond area and subjected to mu SBS test. There were no statistically significant differences between the two storage periods for each solution (p > 0.05). The thymol solution group showed lower mu SBS values than those of distilled water for both storage periods (p < 0.05). As for the formalin group, its mu SBS values were not statistically different from those of distilled water and thymol groups at each storage period (p > 0.05). In conclusion, the thymol solution caused the mu SBS of the resin composite to decrease when compared to both formalin and distilled water after 24 hours and two months. However, the mu SBS of the resin composite was not affected by storage duration.
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    Periostitis Ossificans Managed with Endodontic Treatment
    (AMER SOC DENTISTRY CHILD, 2015) Kucukyilmaz, Ebru; Sener, Yagmur; Tosun, Gul; Savas, Selcuk
    Periostitis ossificans (PO) is a specific type of chronic osteomyelitis. Radiographically, it is characterized by the presence of lamellae of newly formed periosteal bone outside the cortex, giving the characteristic appearance of "onion skin." The most common cause of PO is periapical infection of the mandibular permanent first molar, which occurs primarily in children and young adults. Treatment in these cases is directed toward eliminating the source of the infection, either by extraction of the offending tooth or endodontic therapy. The purpose of this paper is to present a case of PO involving a permanent mandibular first molar managed with endodontic treatment.
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    Temperature rise under normal and caries-affected primary tooth dentin disks during polymerization of adhesives and resin-containing dental materials
    (JAPANESE SOC DENTAL MATERIALS DEVICES, 2008) Tosun, Gul; Usumez, Aslihan; Yondem, Isa; Sener, Yagmur
    The purpose of this study was to compare the temperature rise under normal and caries-affected primary tooth dentin during photopolymerization of two adhesives and resin-containing restorative materials. Caries-affected and normal dentin disks were prepared from extracted primary molars with only mesial or distal approximal caries (4 mm in diameter, 1 mm in height). Temperature rise during photopolymerization of adhesive materials was measured with a J-type thermocouple wire that was connected to a data logger. Data were analyzed with two-way ANOVA and independent samples t-test. Temperature rise under caries-affected primary tooth dentin disks was higher than that of normal primary tooth dentin disks during polymerization of both adhesive systems and resin-containing dental materials (p<0.05). It was found that adhesive systems induced a higher temperature rise during polymerization as compared to the resin-containing restorative materials (p<0.05). In particular, temperature rise during polymerization of adhesive materials exceeded 5.5 degrees C under caries-affected primary tooth dentin.