"In vitro" evaluation of the apical sealing of root canals obturated with different techniques

Abstract

The purpose of this study was to compare the apical sealing of root canals obturated with different techniques. One hundred-six human mandibular incisors were submitted to instrumentation by means of the step-back technique. After instrumentation, one hundred teeth received an impermeable coating on the external surfaces of the crown and root (except for the area nearby the apical foramen). Afterwards, they were divided in five groups containing twenty elements each, according to the obturation technique employed: 1. lateral condensation with Kerr file; 2. continuous wave of condensation technique with System B; 3. thermoplasticized injectable gutta-percha technique with the Ultrafil system; 4. mechanically thermoplasticized gutta-percha with the JS Quick-Fill system and 5. thermoplasticized gutta-percha associated to a master cone with the Microseal system. The six remaining teeth were employed as negative and positive controls. After obturation, the access cavities were sealed and the teeth were immersed in aqueous 2% methylene blue dye for 72 hours at 37ºC. After that, the teeth were longitudinally sectioned and the apical microleakage was evaluated in a stereomicroscope. The Microseal system presented the best apical sealing ability, followed by System B, JS Quick-Fill, Ultrafil and the lateral condensation technique. The statistical analysis of the results demonstrated that: 1. the Microseal system presented an apical sealing similar to System B and better than the other groups; 2. System B presented better apical sealing than the lateral condensation technique, being similar to the other groups; and 3. the lateral condensation, Ultrafil and JS Quick-Fill groups demonstrated similar sealing ability.

Coronal sealing ability of different sealers on teeth obturation and the effectiveness of two different obturation techniques

“…21,22 About obturation techniques, groups of obtura II showed significantly less coronal leakage in comparison to groups of cold lateral compaction especially when AH26 used as a sealer. this result some what in agreement with some authors studies 23,24 as they showed that the cold lateral compaction show higher leakage than thermoplasticized technique. While this result disagreed with some studies, 25 it is concluded that the thermo plasticized technique present the higher level of infiltration than cold lateral compaction.…”

Effect of thermoplastic filling techniques on the push-out strength of root sealing materials

“…This is generally associated with higher material retention. 28 Nevertheless, the cold lateral-compaction technique does not allow complete filling of the root canal system irregularities, resulting in absence of sealer and/or gutta-percha in some canal areas and reduced filling bond strength, 10 as observed in the present study.…”

“…29 Overall, in the present study, better results were observed with thermoplastic filling techniques, but the lateral-compaction bond strength values obtained were in accordance with previous studies which confirmed their clinical acceptability. 5,10,30 Therefore, clinical implications of filling techniques and/or endodontic sealers should not be based on bond strength results alone; assessment of the sealing ability using different infiltration methods as well as 3-D micro-CT evaluations could provide different perspectives and demonstrate the actual effects of the materials/techniques used for endodontic treatment.…”

“…7,8,9,10,11 Among these techniques, lateral-compaction with gutta-percha points provides adequate apical sealing. However, the efficiency of the technique mainly depends on the type of sealer used.…”

Estudo Comparativo do Selamento Apical em Canais Curvos Obturados com Cones Protaper™ e Cimento Ah-Plus™

“…Dentre os materiais para obturação dos canais radiculares os cones de guta-percha são os mais usados mundialmente por apresentarem as propriedades ideais de um material obturador, como a biocompati bilidade, radiopacidade, ser facilmente inserida e removida do interior dos canais radiculares, dentre outros [10][11][12] . Na maioria dos tratamentos endodônti cos a condensação lateral ati va da guta-percha é a técnica de obturação mais uti lizada pela facilidade e prati cidade de execução 13 . A principal função de um cimento endodônti co é preencher os espaços existentes entre os cones de gutapercha e as paredes do canal radicular.…”