Comparison of different techniques for obturating experimental internal resorptive cavities

Abstract

Forty extracted maxillary central incisors were instrumented at the working length to a #50 file. The roots were sectioned transversely with a diamond disk at 7 mm from the anatomical apex. At the opening of the root canal of each section, hemicircular cavities were drilled with a specially designed bur. The corresponding root sections were cemented with glue, thus obtaining root canals with similar cavities that simulated internal resorptions. Teeth were embedded in plaster casts to facilitate their handling. The specimens were randomly separated into four groups of 10. The following obturation techniques were evaluated: lateral compaction (group A), hybrid technique (group B), Obtura II (group C), and Thermafil (group D). AH26 was used as the sealer. After obturation, the plaster was removed and the teeth were radiographed in buccolingual and mesiodistal directions to evaluate the quality of the obturation at the IRC. The incisors were then cut with a scalpel at the same level as the previous section, to examine, under a stereomicroscope, the type of material that filled the IRC. Obtura II gave the best results and in most of the specimens obturated with this technique, the IRC were filled mainly with gutta-percha. Statistical analysis of the data indicated that the differences between group C and the other groups were significant (P < 0.05).

Internal Resorption Treated with Mineral Trioxide Aggregate in a Primary Molar Tooth: 18-Month Follow-Up

“…However, several authors have suggested endodontic treatment, to arrest the destructive process, for cases without external perforation as soon as internal resorption is detected (12,13).…”

“…The persistence of organic debris and bacteria in these irregularities may interfere with the long-term success of the endodontic treatment (12). Therefore, the importance of achieving total obliteration of the root canal space has been stressed in case of internal resorption (14).…”

Management of tooth resorption

“…Treatment generally consists of the preparation of the canal to the apical foramen with particular emphasis on irrigation and ultrasonication so that the resorbed area is cleansed as thoroughly as feasible. The obturation of the canal can be achieved by a variety of techniques including hot vertically condensed gutta-percha, Obtura-delivered hot gutta-percha 18 and more recent innovations such as the Microseal technique.…”

Eficácia de duas técnicas de obturação em cavidades experimentais de reabsorção radicular interna

“…Os resultados obtidos mostraram haver diferença significativa entre as duas incidências radiográficas apenas nos dentes obturados com o sistema ultrassônico, o que está de acordo com os estudos de Goldberg et al 9 e Agarwal et al 7 , que observaram também um menor grau de preenchimento da cavidade de reabsorção na incidência mesiodistal em relação à vestibulolingual.…”

“…Inúmeros equipamentos e técnicas têm sido testados na obturação das cavidades de reabsorção interna 7,9 , sejam estas, condensação lateral e vertical apenas, e uso de um compactador termomecânico e de um sistema termoplastificador, como o Thermafil®. No entanto, nenhuma destas técnicas mostrase satisfatória quanto ao preenchimento total das áreas de reabsorção.…”