A Methylene Blue dye Microleakage Study of Retrograde Filling Materials

U radu se je in vitro tehnikom prodora boje ispitivalo retrogradno brtvljenje korijenskoga kanala nakon apikotomije postignuto amalgamom, kompozitnom smolom, svjetlosnopolimerizirajućim i konvencionalnim stakleno-ionomernim cementom. Korijenski kanali 45 jednokorijenskih zuba gornje čeljusti instrumentirani su “step-back” tehnikom te ispunjeni gutaperkinim štapićima i Diaket pastom. Apeksni je vršak korijena odrezan pod kutem od 20° te su izrađeni retrogradni kaviteti I. razreda. Korijeni su slučajnim odabirom podijeljeni u pet skupina i punjeni s jednim od navedenih materijala. Nakon sedmodnevnog uranjanja u tintu, zubi su podvrgnuti procesu bistrenja, a prodor boje očitan je elektronskim povećalom. Srednja je vrijednost prodora boje za amalgam iznosila 1,09 mm (s.d. 0,78), za kompozitnu smolu 1,47 mm (s.d. 0,86), za Fuji IX GC 1,43 mm (s.d. 0,88) i za Photac-Fil 1,45 mm (s.d. 1,12). Nije bilo statistički vjerodostojnije razlike između ispitivanih skupina.The retrograde sealing ability o f high copper zinc containing amalgam, composite resin and two glass-ionomer materials was evaluated in 45 extracted human anterior teeth. The apical part was resected using a 20 degree bevel. Apical preparation 3 mm deep were prepared with a fissure bur. The teeth were divided into five groups, of 9 samples each. The apical preparation in the first group were filled by amalgam, in the second by adhesive and composite resin (Pertac) in the third group by Fuji IX glass-ionomer, and in the fourth group by Photac-Fil glass-ionomer. The fifth group was a positive control. After 30 days in saline solution at 37 °C they were covered by nail varnish, except for the cutting surface, and placed in 1% ink for one week at 37 °C. After clearing process (5% nitric acid, alcohol, and methyl salicilate) the dye penetration was recorded by electronic magnification device. Mean dye leakage o f amalgam was 1.09 mm (s.d. 0.78), composite resin Pekafill 1.47 mm (s.d. 0.86), Fuji IX GC 1.43 mm (s.d. 0.88) and Photac-Fil 1,45 mm (s.d. 1.12). There was no statistical significant difference among the materials