Relación entre la conformación del conducto radicular y las técnicas de obturación tras la instrumentación con TruNatomy, Wave One Gold y ProTaper Gold en conductos curvos simulados de EndoTraining Blocks / Relation between canal shape and filling techniques after instrumentation with TruNatomy, WaveOne Gold, and ProTaper Gold in simulated curved canals from Endo Training Blocks

OBJETIVO: Evaluar en conductos simulados instrumentados con técnicas mecanizadas, la profundidad de penetración de los instrumentos para la obturación con diferentes técnicas y sistemas. MATERIALES Y MÉTODOS: Se emplearon 30 conductos simulados divididos en 3 grupos de 10. Grupo 1. Instrumentado con TruNatomy Prime, Grupo 2. Instrumentado con Wave One Gold Primary y Grupo 3. Instrumentado con ProTaper Gold F2. En cada grupo se realizaron 4 pruebas. 1. Nivel de penetración del atacador manual 9P de 0.6 mm Schilder; 2. Nivel de penetración del atacador Calamus #40 .03; 3. Nivel de penetración de la cánula Calamus 23G; 4. Nivel de penetración del verificador SV20 de GuttaCore para el Grupo 1 y el SV25 para los grupos 2 y 3. Para la evaluación estadística se utilizó análisis de variancia y prueba de Tukey para comparaciones múltiples. Nivel de significación P < 0,05. RESULTADOS: En las pruebas 1,2 y 3, las preparaciones con TruNatomy mostraron una penetración menor de los instrumentos de obturación comparada a las de WaveOne Gold y ProTaper Gold. En la prueba 4, el verificador SV20 fue adecuado con el TruNatomy, en tanto el SV25 lo fue para WaveOne Gold y ProTaper Gold. El análisis estadístico de las pruebas 1,2 y 3 mostró diferencia significativa entre TruNatomy y los otros grupos. En la prueba 4 todos los verificadores penetraron adecuadamente. CONCLUSIONES: 1.- La preparación con TruNatomy Prime dificultó la penetración de los dispositivos necesarios para la obturación con las diferentes técnicas. Para el GuttaCore, el verificador empleado debería ser de un calibre menor al instrumento de prepa-ración. 2.- Los instrumentos WaveOne Gold Primary y ProTaper Gold F2 produjeron una conformación que permitió una penetración mayor de los dispositivos de obturación. Los verificadores GuttaCore de dichos sistemas coincidieron con los instrumentos de preparación

OBJECTIVE: The aim of the study was to evaluate depth of penetration of the instruments used in different obturation techniques and systems in simulated curved canals prepared with three different techniques. MATERIALS AND METHODS: Thirty with simulated curved canals were used and divided into three groups. Group 1 Was instrumented with TruNatomy Prime. Group 2. Was instrumented with WaveOne Gold Primary. Group 3. Was instrumented with ProTaper Gold F2. In each group four tests were carried out. 1. for depth of penetration of manual plugger 9P 0.6 mm Schilder; 2. for depth of penetration of the Calamus Dual plugger #40 .03; Test 3. for depth of penetration of the Calamus Dual cartridge 23G. Test 4. for depth of penetration of the GuttaCore SV20 verifier for group 1 and SV25 verifier for groups 2 and 3. The results were statistically evaluated by the analysis of variance and Tukey multiple comparison test. The level of significance was set at P < 0.05. RESULTS: In tests 1, 2 and 3 canals prepared with TruNatomy showed lower penetration depth than groups prepared with WaveOne Gold Primary and ProTaper Gold. In test 4 verifier SV20 was adequate for TruNatomy, while SV25 was for WaveOne Gold and ProTaper Gold. Statistical analysis of tests 1,2 and 3 showed a significant difference between TruNatomy and the other groups. In test 4, all the verifiers penetrated adequately. CONCLUSIONS:1.- The use of TruNatomy Prime in simulated curved canals limited the penetration of the devices from the different obturation techniques. GuttaCore verifier should be selected one caliber less than the instrument used. 2. WaveOne Gold Primary and ProTaper Gold F2 shaped a canal that allowed deeper penetration of the obturation devices. GuttaCore verifiers employed corresponded with the instruments used

Relationship between unintentional canal overfilling and the long-term outcome of primary root canal treatments and nonsurgical retreatments: a retrospective radiographic assessment.

AIM: To determine retrospectively the long-term radiographic outcome of root canal treatments and root canal retreatments with unintentional root canal overfilling. METHODOLOGY: A total of 220 root canal treatments (143 primary/77 retreatments) with postoperative unintentional canal overfilling and performed by two endodontists during their 45 years of private practice were included in the study. Lateral condensation techniques and nine different sealers were used. Overfilling was confirmed with a postoperative periapical radiograph and patients were scheduled regularly for recall visits. Average recall time was 4.86 years (maximum = 30 years). Two calibrated observers evaluated the radiographs and determined the long-term outcome using the PAI score pooled in a 3-category scale. The persistence or resorption of the extruded material was registered. The Kappa coefficient (K) was calculated and a logistic regression was used for further analysis. Odds ratios and their 95% CI were estimated. RESULTS: The level of inter-observer agreement was 66.1%. Primary root canal treatments had a significantly (P = 0.015) greater rate of success (91.6%) than retreatments (81.8%). Tooth location (P = 0.019) was the only other factor that significantly affected the outcome. The type of extruded material, and its resorption or persistence did not relate to the outcome. Persistence of extruded material was significantly affected by tooth location and recall time after treatment. CONCLUSION: The outcome of root canal treatment with unintentional canal overfilling was not associated with the type of extruded material or its resorption or persistence. The persistence of extruded material did not relate to a favourable or unfavourable outcome.

Comparison of different techniques for obturating experimental internal resorptive cavities.

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).