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- 저자 : Hayati Aygün (검색결과 2 건)
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Hayati Aygün,Albert Çakar,Nergiz Hüseyinoğlu,Urfettin Hüseyinoğlu,Recep Çelik 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.5
Study Design: Eighty-four patients who had been treated for degenerative spinal diseases between January 2006 and June 2009 were reviewed retrospectively. Purpose: We aimed to compare the clinical and radiologic findings of manual workers who underwent posterolateral fusion (PLF) or posterior interbody fusion (PLIF) involving fusion of 3 or more levels of the spine. Overview of Literature: Previous studies have concluded that there is no significant difference between the clinical outcome of PLF and PLIF techniques. Methods: After standard decompression, 42 patients underwent PLF and the other 42 patients underwent PLIF. Radiologic findings, Oswestry disability index (ODI) scores, and visual analogue scale (VAS) scores were assessed preoperatively and at 6-month intervals postoperatively and return to work times/rates were assessed for 48 months. Results: Patients who underwent PLF had significantly shorter surgical time and less blood loss. According to the 48-month clinical results, ODI and VAS scores were reduced significantly in the two groups, but the PLIF group showed better results than the PLF group at the last follow-up. Return to work rate was 63% in the PLF group and 87% in the PLIF group. Union rates were found to be 81% and 89%, respectively, after 24 months (p =0.154). Conclusions: PLIF is a preferable technique with respect to stability and correction, but the result does not depend on only the fusion rates. Discectomy and fusion mass localization should be considered for achieving clinical success with the fusion technique. Before performing PLIF, the association of the long operative time and high blood loss with mortality and morbidity should be taken into consideration, particularly in the elderly and disabled patients.
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Evaluation of the crack formation of feldspathic ceramic reinforced with bor chemicals
Mustafa Hayati Atala,Esma Başak Gül Aygün,Arife Doğan 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.4
The purpose of the current study was to improve the mechanical strength and reduce the micro-cracks on the microstructureof the dentin ceramic through addition of various boron compounds (borax, boric acid). Following addition of borax and boricacid (1, 2, 3% of the weight percent) to the traditional feldspathic porcelain; crack lengths, flexural strength and fracturetoughness were analyzed. The data analyses were performed by using one-way ANOVA (p<0.05). Differences between groupswere determined by Tukey HSD. The results of the present study suggested that the crack lengths were decreased and thefracture toughness were increased in all boric acid added groups (p<0.05). The group containing 1% boric acid hadsignificantly decreased the biaxial flexural strength value compared to the control group (p<0.05). The Vicker’s hardness valueof the group containing 1% borax was found to be significantly lower (p<0.05). The present study demonstrated that variousproportions of borax and boric acid addition in dentin ceramic had reduced the formation of cracks. The current study couldbe a good starting point on reinforcement of dental ceramics with a possible outcome that will reduce the failures of dentalrestorations.
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