Abstract
ObjectiveThis study used dye leakage assay and scanning electron microscopy to evaluate, respectively, the sealing ability and marginal adaptation of three root-end filling materials used as apical plugs, as well as the possible correlation between these properties.Material and MethodsNinety-eight single-rooted human teeth were prepared to simulate an open apex. The teeth were allocated to three experimental groups (n = 30), which received a 5-mm thick apical plug of (1) gray MTA AngelusTM, (2) CPMTM and (3) MBPc, and two controls groups (n = 4). After immersion in 0.2% Rhodamine B solution for 48 h, the teeth were sectioned longitudinally and analyzed by Image Tool 3.0 software. The marginal adaptation between apical plugs and the root canal walls were analyzed by SEM.ResultsMBPc had significantly less (p<0.05) apical leakage than the other materials. Regarding marginal adaptation, CPMTM showed the best numerical results, though without statistical significance from the other materials (p<0.05). There was no correlation between the two properties.ConclusionsWhen used as apical plugs, the tested root-end filling materials had similar marginal adaptation to the dentin walls, but MBPc had the best sealing ability, as demonstrated by the least apical leakage from all tested materials.
Highlights
When immature teeth develop pulp necrosis, dentin formation is interrupted and root development ceases
The sealing ability of the apical plugs fabricated from the different root-end filling materials can be classified, in descending numerical order of apical leakage, as follows: MBPc (1.99 ± 1.44 mm), Gray mineral trioxide aggregate (MTA)-AngelusTM (3.39 ± 1.39 mm) and CPMTM (4.00 ± 1.00 mm)
The marginal adaptation of the apical plugs fabricated from the different rootend filling materials can be classified, in descending numerical order of marginal gap size, as follows: CPMTM (337.71 ± 561.93m), gray MTA-AngelusTM (395.21 ± 760.58m) and MBPc (474.11 ± 872.13m)
Summary
When immature teeth develop pulp necrosis, dentin formation is interrupted and root development ceases. The aim of the treatment of teeth with open apex is to seal a sizeable communication between the root canal system and the periradicular tissue, and provide a barrier against which filling material can be compacted. The aim of the treatment of teeth with open apex is to seal a sizeable communication between the root canal system and the periradicular tissue, and provide a barrier against which filling material can be compacted3 Materials such as calcium hydroxide and, more recently, mineral trioxide aggregate (MTA), have been used as apical plugs. MTA was developed by Torabinejad in the early 1990s, and the first study on this material was published by Lee, et al. (1993).
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