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Now showing 1 - 3 of 3
  • PublicationMetadata only
    Can We Improve the Laser Etching with the Digitally Controlled Laser Handpiece-Xrunner?
    (2017-06-01T00:00:00Z) YILANCI, HİLAL; Usumez, Serdar; Usumez, Aslihan; YILANCI, HİLAL
    Objective: The aim of this study was to compare the shear bond strength (SBS), enamel surface characteristics, and the adhesive remnant index (ARI) scores of different etching methods. Background data: Laser etching changes the physical characteristics of the enamel surface and these alterations hold promise for the conditioning of enamel for bonding procedures. A new Er:YAG laser handpiece is unique in its ability to digitally control size, shape, and depth of irradiated enamel area. Materials and methods: Ninety-eight premolar teeth were used in this study. Eighty of 98 teeth were divided into four experimental groups of 20 teeth each for SBS testing: (1) 37% phosphoric acid, (2) manual Er:YAG laser (120mJ, 10Hz, and 1.2W), (3) manual Er,Cr:YSGG laser (45mJ, 50Hz, and 2.25W), and (4) digitally controlled Er:YAG laser (Xrunner; 100mJ, 10Hz, 1W). The SBS values and ARI scores were recorded. Eighteen teeth were used to evaluate the surface morphology with scanning electron microscopy and atomic force microscopy after etching and following debonding and restoration. Results: Mean SBS value was 7.75 +/- 2.5MPa for Xrunner and 8.11 +/- 3.5, 9.47 +/- 3.3, and 7.11 +/- 3.7MPa for the acid, Er,Cr:YSGG, and Er:YAG groups, respectively (p=0.148). However, the acid etching group demonstrated significantly higher ARI scores (p<0.001). Conclusions: All etching methods caused enamel surface irregularities and were effectively restored to its original gloss. Laser etching was found to be an alternative to acid etching; however, the clinical success should be evaluated with further studies.
  • PublicationMetadata only
    The effects of water flow rate on shear bond strength of self etch resin cement to dentin surface after Er, Cr: YSGG laser etching
    (2017-01-01T00:00:00Z) KURT, AYŞEGÜL; YILANCI, HİLAL; YÖNDEM, İSA; Usumez, Aslihan; YILANCI, HİLAL
    The aim of the present study was to evaluate the effect of water flow rate on the morphological features of dentin and shear bond strength (SBS) of self-etching resin cement after Er, Cr: YSGG laser etching. Dentin specimens obtained from extracted human third molars were randomly assigned to four groups (n = 23), including one that received no laser irradiation (control-group D) and three others with different laser parameters: 2.25 W, 50 Hz, 60% air with water flow rates of 19 mL/min-100% water (group A), 2.25 W, 50 Hz, 6.75 mL/min-50% water (group B), and 2.25 W, and 50 Hz, 2.75 mL/min-25% water (group C). The morphological features of each group were examined with scanning electron microscopy and atomic force microscopy. The SBS of resin cement disks (Panavia F2.0, Kuraray; Tokyo, Japan) (3 mm in diameter and 2 mm in height) to the dentin specimens was measured using a universal testing machine at a cross head speed of 0.5 mm/min. Bond strength values were analyzed with one-way ANOVA/Tukey tests. There were no significant differences between the SBS values of groups A and B (p > 0.05). However, the SBS values of these groups were significantly higher when compared to groups C and D (p < 0.001). Er, Cr: YSGG laser application with water flow rates of 6.75 or 19 mL/min resulted in better dentin surface alterations and increased the SBS of self-etching resin cement to dentin.
  • PublicationMetadata only
    Intrapulpal Temperature Increase During Er: YAG Laser-Aided Debonding of Ceramic Brackets
    Objective: The purpose of this study was to evaluate the temperature changes in the pulp chamber while using a newly introduced application of Er: YAG laser to debond ceramic brackets in a study model with a pulpal circulation with and without thermocycled samples. Background data: An esthetic alternative to stainless steel brackets, ceramic brackets have been proposed. However, because of their low fracture resistance and high bond strengths, ceramic brackets can cause a problem when they are being removed using conventional techniques. Materials and methods: Experimental Groups A and B were established for samples with or without thermocycling. The same 20 maxillary central incisor and 20 premolar teeth were used in both groups. Pulpal blood microcirculation was simulated using an apparatus described in a previous study. Monocrystalline brackets were bonded by using Transbond XT. In Group A, brackets were debonded using the Er: YAG laser (600 mJ, 2 Hz, long pulse, and no air or water spray) after being stored in distilled water for 24 h. In Group B, brackets were debonded using the same laser system as that used in Group A after being stored in distilled water for 24 h and then thermocycled for a total of 5000 cycles between 5 degrees C and 55 degrees C. The laser irradiation duration and intrapulpal temperature changes were measured. Results: In Group B, the intrapulpal temperature increase of the central incisors was significantly higher than that of the premolar teeth. In the central incisor and premolar teeth groups, there were no statistically significant difference between Groups A and B (p > 0.05). A positive correlation was found between laser irradiation duration and temperature increase (p < 0.01). Conclusions: The use of Er: YAG laser is an effective method for debonding the monocrystalline ceramic brackets. This method can be used safely under the consideration of intrapulpal temperature changes.