EFFECTS OF SODIUM HYPOCHLORIDE ON CYCLIC FATIGUE RESISTANCE OF BIORACE ROTARY INSTRUMENT WITH DIFFERENT TIP SIZES

Öz

Aim: The aim of the present study was to determine the effect of sodium hypochloride solution on the cyclic fatigue resistance of BioRace (BR) NiTi instrument with different tip size. Methods: Eighty BioRace instrument with two different size (BR4-35.04 and BR5-40.04) were used. These instruments were randomly divided into four group, each containing 20 files. The cyclic fatigue resistance were than tested in the following conditions; group 1, BR 4 with no immersion; group 2, BR 4 with dynamic immersion in 5.25% NaOCl at 37°C ± 1°C for 5 minute; group 3, BR 5 with no immersion; group 4, BR 5 with dynamic immersion in 5.25% NaOCl at 37°C ± 1°C for 5 minute. Then the instruments were used in stainless steel artificial root canal with a curvature of 60° and 5 mm radius. Number of cycle to failure (NCF) were measured for each group. The time to failure (TTF) in seconds were also recorded. Data were subjected to the statistical analysis. Results: Nonimmersion groups were statistically superior to immersion groups (group1>group 2 and group 3>group4) both regarding TTF and NCF. However, no significant difference was found between instruments with different tip size regardless of the immersion procedure. Conclusion: The cyclic fatigue resistance of BR instrument was affected by NaOCl immersion but not with tip size. Keywords: BioRace, cyclic fatigue resistance, sodium hypochloride Sodyum Hipokloritin Farklı Boyutlardaki Biorace Döner Aletinin Döngüsel Yorgunluk Direncine Etkisinin Değerlendirilmesi Öz Amaç: Bu çalışmanın amacı sodyum hipokloridin aynı taper değerine sahip ancak farklı uç boyutları olan BioRace (BR) döner alet sistemi eğelerinin döngüsel yorgunluğuna etkisini değerlendirmektir. Gereç ve yöntem: Bu çalışmada toplam seksen adet BioRace (BR4-35.04 ve BR5-40.04) aleti kullanıldı. Eğeler, her bir grupta 20 adet olacak şekilde rastgele 4 gruba ayrılmıştır. Daha sonra aletlerin döngüsel yorgunluğu şu şekilde test edildi; Grup 1, BR 4 hiç bir solüsyonda bekletilmeden; Grup 2: BR 4 5 dakika boyunca %5,25 NaOCl solüsyonunda 37°C ± 1°C’de dinamik uygulama sonrası ; Grup 3: BR 5 hiç bir solüsyonda bekletilmeden; Grup 4: 5 dakika boyunca %5,25 NaOCl solüsyonunda 37°C ± 1°C’de dinamik uygulama sonrası 60° kurvatür açılı ve 5 mm kurvatür yarıçaplı paslanmaz çelik bloktan üretilmiş eğimli olukta test edildi. Her bir eğenin kırılana kadarki döngü sayısı (NCF) ölçüldü. Kırılana kadarki süresi (TTF) ise saniye cinsinden kaydedildi. Elde edilen veriler istatistiksel analizler ile değerlendirildi. Bulgular: TTF ve NCF değerleri göz önüne alındığında sodyum hipokloritte bekletilmeyen gruplar bekletilen gruplardan daha dirençli bulundu. Bununla beraber, aletlerin uç boyutlarındaki farkın kırlma dirençleri üzerinde istatistiksel olarak anlamlı bir etkisinin olmadığı görüldü. Sonuç: BioRace döner aletinin döngüsel yorgunluk direnci sodyum hipokloritten etkilenirken, farklı uç boyutlarının böyle bir etki yaratmadığı görüldü. Anahtar Kelimeler: BioRace, döngüsel yorgunluk direnci, sodyum hipoklorit

Anahtar Kelimeler

• BioRace
• cyclic fatigue resistance
• sodium hypochloride

Kaynakça

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