Cilj: Cilj rada bio je ispitati propusnost ispuna korijenskih kanala izrađenih tehnikom hladne lateralne kondenzacije, tehnikom jedne gutaperke i tehnikom Thermafil u kontroliranim uvjetima vakuuma. Materijali i metode: U istraživanju je korišteno 49 jednokorijenskih zubi koji su podijeljeni u 3 skupine po 15 uzoraka, te pozitivna i negativna kontrola sa po 2 zuba. Dvije skupine intrumentirane su ručno, tehnikom step-back i ispunjene tehnikom hladne lateralne kondenzacije i tehnikom Thermafil. Treća skupina instrumentirana je strojno, sustavom ProTaper i ispunjena tehnikom jedne gutaperke. Nakon sedmodnevnog stvrdnjavanja, uzorci su premazani izolacijskim lakom i voskom te stavljeni u vakuumsku posudu s dodatkom metilenskog modrila. Zrak je istisnut uz pomoć vakuumske pumpe i postignut je tlak od 75 torra. Uzorci su longitudinalno raskoljeni i izmjeren je linearni prodor boje uz pomoć stereomikroskopa. Rezultati: Srednje vrijednosti dobivenih mjerenja bile su 4,67 ± 4,19 mm kod hladne lateralne kondenzacije, 3,61 ± 4,36 mm kod tehnike jedne gutaperke i 1,17 ± 0,86 kod tehnike Thermafil. Temeljem dobivenih rezultata statistički znatno manji prodor boje dobiven je tehnikom Thermafil u usporedbi s tehnikom hladne lateralne kondenzacije. Zaključak: Iako je Thermafil tehnika rezultirala najmanjim prodorom boje, sve tri tehnike punjenja pokazale su apikalno propuštanje.

Objectives: The aim of this study was to assess leakage of root canals obturated using different techniques: cold lateral condensation, single-cone technique and Thermafil technique under controlled vacuum conditions. Material and Methods: Forty-nine single-rooted teeth were divided into three groups of 15 samples each, and positive and negative control group with two samples in each of them. Two groups were instrumented using manual (Step-back) technique and obturated by cold lateral condensation and Thermafil techniques. Third group was instrumented using rotary (ProTaper) technique and obturated with single-cone guttapercha. After a one-week setting period, the samples were covered by insulating varnish and wax and placed in a vacuum flask containing methylene blue dye. The air was evacuated with a vacuum pump to a pressure of 75 torr. The samples were sectionated longitudinally and the linear extent of dye penetration was measured. Results: Group mean linear dye penetration values were: cold lateral condensation 4.67 ± 4.19 mm, single-cone 3.61 ± 4.36 mm, and Thermafil 1.17 ± 0.86 mm. The results indicate significantly lower dye-penetration in samples obturated using Thermafil technique, when compared to the samples obturated using cold lateral condensation. Conclusion: Even though Thermafil technique resulted in the least amount of a dye- penetration, all obturation techniques showed apical leakage.