Microleakage comparison of four dental materials as intra-orifice barriers in endodontically treated teeth

The aim of this in vitro study was to compare polymicrobial microleakage of calcium enriched mixture [CEM] cement, mineral trioxide aggregate [MTA], amalgam, and composite resin as intra-orifice sealing materials. Seventy single-rooted mandibular premolars were instrumented and obturated by cold lateral compaction technique. The teeth were randomly divided into four experimental groups according to used material: CEM, MTA, amalgam and composite resin [n=15] and two control groups [n=5]. In experimental groups, 2 mm of coronal gutta-percha was removed and replaced with the study material. All the teeth were mounted in a two-chamber apparatus and the coronal portion was exposed to human saliva. The day the turbidity occurred was recorded for each sample. Data were analyzed using one-way ANOVA. The negative control group showed no leakage while the average microleakage time in the positive control group was 3.5 days. The average bacterial leakage times for amalgam, composite resin, MTA, and CEM groups were 27.42 +/- 3.6, 29.35 +/- 3.15, 52.57 +/- 2.87, and 50.42 +/- 2.73 days, respectively. There was no significant difference between CEM and MTA groups [P=0.27] and also between amalgam and composite resin groups [P=0.36]. However, in term of average leakage time, MTA and CEM groups exhibited significant differences with amalgam and composite resin groups [P<0.001]. According to the results of the present in vitro study, in terms of coronal sealing in endodontically treated teeth, CEM and MTA are more effective than amalgam and composite resin

Comparison of apical microleakage using Ni-Ti with stainless steel finger spreaders

The purpose of this in vitro study was to compare apical microleakage after obturation with Nickel-Titanium [NiTi] compared to Stainless Steel [SS] finger spreaders. Eighty straight single-rooted human teeth were instrumented using step-back technique. The specimens were randomly divided into four groups. The two experimental groups [n=30] and the negative control group [n=10] were obturated by lateral condensation technique with Ariadent gutta-percha and AH26 sealer. The roots in the positive control group [n=10] were instrumented but not obturated. In one group, SS and in another group NiTi spreaders were used. Microleakage evaluation was conducted using dye penetration method t-test was used for statistical analysis. The results showed statistically significant differences between NiTi and SS groups [P=0.022], with the greatest dye penetration in SS group and the least in NiTi group. According to the results of the present study using NiTi spreader decrease apical microleakage in endodontically treated teeth