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  • Küçük Resim
    Öğe
    A Comparison of the Low-Level Laser Versus Low Intensity Pulsed Ultrasound on New Bone Formed Through Distraction Osteogenesis
    (Mary Ann Liebert, Inc, 2012) Koçyiğit, İsmail Doruk; Coşkunses, Fatih Mehmet; Pala, Elvan; Tuğcu, Funda; Önder, Ercüment; Mocan, Asriye
    Objective: To assess and compare the effects of low-intensity pulsed ultrasound stimulation (LIPUS) and low-level laser therapy (LLLT) on the bone mineral density (BMD) of bone formed through distraction osteogenesis (DO) using dual energy x-ray absorptiometry (DEXA). Background data: LIPUS and LLLT are noninvasive supporting treatment concepts used for wound healing. LIPUS has been used to accelerate bone healing through the therapeutic effect arising from piezoelectric and angiogenetic effects on cell membranes. LLLT known as "photobiomodulation'' is used in the treatment of soft and hard tissue injuries. Methods: The study was conducted with 15 New Zealand rabbits randomly divided into three groups of 5 according to treatment, as follows: Group A: DO was performed with no further treatment; Group B: DO was performed followed by 30mW/cm(2) LIPUS at 1 Mhz for 20 min/day during the distraction period; Group C: DO was performed followed by 25mW/cm(2) LLLT at 650 nm for 10 min/day during the distraction period. DEXA was used to examine the treated areas prior to surgery and at 30 and 60 days postoperatively. Results: In the control group, the mean BMD values at both 30 and 60 days postoperatively were below the baseline level, whereas they were above at the same time intervals in the LIPUS group. In the LLLT group, the mean BMD value at 30 days postoperatively was below the baseline level, whereas it was above the baseline level at 60 days postoperatively. Conclusions: LIPUS and LLLT applied during the distraction period accelerated the DO treatment.
  • [ X ]
    Öğe
    Investigation of the Sodium Titanate Surface Behavior in Corrosive Oral Fluids by Comparing with Conventional Titanium Surfaces
    (2021) Çulhaoğlu, Ahmet Kürşad; Özgül, Özkan; Tekin, Umut; Önder, Ercüment
    Objective: Titanium (Ti) and Ti alloys are suitable options as implant material because they are biocompatible and form a corrosion protective titanium oxide layer. However, the oxide layer issensitive to corrosive ions such as fluoride (F) and hydrogen peroxide(H2O2) which are normally found in human mouth. Commercially produced toothpastes, mount rinses and cariostatic gels contain between0.1% and 1% content F concentration. Furthermore, H2O2 can be secreted during inflammatory reactions by bacteria in oral environment.The corrosion of dental implants and components can cause failure ofdental implant treatment. The aim of this study was to analyse the effects of different F and H2O2 concentrations on different treated Ti alloy(Ti6Al4V) in surfaces. Material and Methods: The effects of different F (0.5%, 2.5%) and H2O2 (0.1%, 10%) concentrations on differenttreated Ti6Al4V surfaces [electro-polished, roughed, fine-roughed andsodium titanate-treated (NaTi)] were analysed. Scanning electron microscopy and inductively coupled plasma with optical emission spectrometer provided quantitative bulk elemental composition for Tisamples. Results: Median corrosion values of Ti (mg/L) and V (mg/L)corrosion levels in 10% H2O2 and 2.5% F solutions were significantlyhigher than 0.1% H2O4, 0.5% F and control solutions. Median Ti corrosion values observed in electro-polished, roughed and fine-roughedgroups were statistically higher than NaTi treated surfaces. Conclusion: This study shows that low ion release on NaTi surfaces causesthe least amount of corrosion. Consequently, NaTi coating should beconsidered as the best alternative for protecting Ti surfaces from corrosion.