No abstract

No abstract

The aim of this in vitro study was to evaluate the effects of different types of adhesive systems on the microleakage of compomer restorations in Class V cavities prepared by erbium, chromium: yttrium scandium gallium garnet (Er,Cr:YSGG) laser. There were five test groups according to the type of adhesive applied to the cavities: Adper Single Bond 2 (Group 1), Scotchbond Multi-Purpose Plus (Group 2), Xeno III (Group 3), Clearfil Protect Bond (Group 4), Prime&Bond NT (Group 5). Dye penetration was evaluated under a stereomicroscope, and data were statistically analyzed by Kruskal-Wallis and Wilcoxon Signed Ranks tests. Gingival margins showed significantly higher microleakage than occlusal margins in all the test groups (p<0.05). Groups 1 and 2 showed significantly less microleakage than Group 5 (p<0.05), and there were no statistically significant differences among Groups 3, 4, and 5 (p>0.05). None of the dentin bonding agents eliminated microleakage completely, and higher microleakage scores were observed along the gingival margin than the occlusal margin.

ABSTRACTconsiderable effects on the patient's work activity and quality of life (8,17,22,30).AVMs can be treated with microsurgery, stereotactic radiosurgery (RS) and endovascular embolization (8). Surgical removal is the initial treatment of choice in appropriate patients as it removes immediate relief from hematoma in ruptured AVMs and decreases the bleeding risk (3,8,38). However, rates of permanent morbidity and mortality related to microsurgery range between 3.9-25% and 0.7-4.2%, respectively (3,4,8,12,15,19,20,24,25). █ InTRODuCTIOn C erebral arteriovenous malformations (AVM) are congenital and benign lesions detected in generally young and healthy individuals. AVMs are pathological connections between arteries and veins without capillaries (2,8,12,17,21,26,31). The prevalence of AVMs in general population is 1.4-4.3% (1,11,16,18,29), with a spontaneous hemorrhage risk of 2-5% in untreated AVMs, and 0.7-1% annual mortality rate (7,23,42). Permanent morbidity risk is 2-3% and annual mortality risk is 1% (8,30). Additionally, AVMs may cause headache, seizures and progressive neurological deficits due to ischemia of surrounding brain tissue, with AIM: Cerebral arteriovenous malformations (AVM) are pathological connections between arteries and veins without capillaries. Stereotactic radiosurgery (RS) is a proven and accepted treatment method for cerebral AVMs. Our objective was to analyze the factors influencing the clinical outcome in patients suffering from AVMs. MATERIAL and METhODS:We retrospectively reviewed 199 patients who were treated with Gamma-Knife RS for intracranial AVMs between 13 October 2005 and 31 October 2010. There were 89 male, 110 female patients with a median age of 32 years (range, 3-74 years). Obliteration was assessed with MRI angiography and DSA imaging. RESuLTS:Complete obliteration rate after RS was 71 % (141 out of 199), including second RS treatments. In terms of obliteration rates, there was no significant difference between patients younger and older than 21 years old (p=0.669). After RS, 3 patients died due to intracranial hemorrhage and 1 died of heart disease. Death from AVM was determined as 1.5 %. Intracranial hemorrhage was observed in 7 (3.5 %) patients post-RS.COnCLuSIOn: Obliteration was found to be associated with Spetzler-Martin Grade, Pollock-Flickinger Grade, AVM volume, RS dose, bleeding history before RS and no previous embolization before RS. Gamma knife RS is an effective treatment method for the treatment of AVMs both for pediatric and adult patients. It provides high obliteration and low mortality rates.

Objective: To evaluate the residual debris and smear layer formation, and also preparation time of one or multifile manual, rotary, and reciprocal systems on primary teeth. Materials and methods:A total of 75 primary mandibular molar teeth were randomly divided to five groups (n=15). The distal canals of teeth were shaped with each of the K file, Protaper, Twisted File, OneShape, and Reciproc systems. Preparation time was also recorded. Longitudinal sections groups were prepared and processed for observation under scanning electron microscopy (SEM) at a standard magnification of X1000 for smear layer and X200 for residual debris. The presence of smear layer and residual debris was evaluated by two trained operators. The data of preparation time and also debris and smear scores were analyzed using ANOVA and the Kruskal-Wallis test, respectively.Results: Reciproc and OneShape systems had significantly less instrumentation time than all other groups (p<0.001). The results of statistical analyses were the same for the residual debris and smear layer scores. In the coronal thirds of the canals, the canal preparation with the Protaper system resulted in significantly less debris and smear layer compared with the OneShape system (p=0.015). In the middle thirds of the canals, OneShape and Reciproc systems had more residual debris and smear layer than the Protaper system (p<0.05). In the apical thirds of the canals, the use of the Protaper instruments resulted in less debris and smear layer than the Reciproc system (p=0.034). Conclusions:Within the limits of this study, the Protaper system, which showed better cleaning efficacy and was also faster than the manual system, can be an effective alternative to other systems in the root canal treatment of primary molars. More in vitro and clinical investigations are needed on root canal treatment of primary teeth.