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Objective : This study aimed to evaluate the D0 diameter of standardized gutta-percha cones for four mechanized systems: ProTaper Universal®, Mtwo®, Wave One® and Reciproc®. Methods: An endodontic calibrator ruler was used to measure the D0 diameter of 60 main cones of the above systems. Measurements were made according 3 scores as follows: gutta-percha cone fits exactly into the same hole as the endodontic ruler gauge (score 1), cone falls short of the ruler gauge whole size (score 2); or exceeding the ruler gauge hole size (score 3). The diameters D0 obtained were compared with the values reported by manufacturers. All data were analyzed by means of T Test, at 1% level of significance. Results: The average value measured was significantly higher than the measures established by manufacturers (p <0.001). Conclusion : The gutta-percha cones of ProTaper Universal® systems Mtwo®, Wave One® and Reciproc® were not standardized, except for R40 cone of the Reciproc® system (Reciproc®). The trend was for variation in the D0 Diameter towards increasing measurement values.

Introduction This study discusses a nonconventional therapeutic protocol for type III dens invaginatus. This condition is a disorder of dental development, caused by the invagination of enamel into coronal and/or radicular dentin structure. This promotes several structural alterations within the dental organ, which offers challenges and difficulties to perform the endodontic treatment when needed. This article reports a clinical case where a conservative approach was adopted to preserve the invaginated tooth, and endodontic treatment was performed in the main necrotic canal. Following 21 years of observation, a complete root formation could be seen, with dental pulp preservation of the pulpotomized tooth. Considering the reported difficulties for the treatment of dens invaginatus, conservative measures, such as pulpotomy to preserve the remaining dental pulp may be an excellent alternative to allow less invasive procedures, thus avoiding endodontic surgery. This study discusses a nonconventional therapeutic protocol for type III dens invaginatus. A conservative approach adopted preserved the invaginated tooth, and root canal treatment was performed in the main necrotic canal. Following 21 years of observation, there was complete root formation, with dental pulp preservation of the pulpotomized tooth. How to cite this article Kunert GG, Kunert IR, de Figueiredo JAP, Barletta FB, Estrela C. Nonconventional Therapeutic Protocol for Type III Dens Invaginatus. J Contemp Dent Pract 2017;18(3): 257-260.

Introdução: O preenchimento com material endodôntico obturador em dentes com reabsorção radicular interna é extremamente difícil. Objetivo: Avaliar a eficácia de duas técnicas de obturação no preenchimento de cavidades experimentais de reabsorção interna. Material e método: Vinte incisivos centrais superiores artificiais, com a presença de uma cavidade simulada padronizada de reabsorção no terço médio do canal radicular, foram utilizados. Após o preparo endodôntico dos dentes, os mesmos foram randomicamente divididos em dois grupos (n=10), de acordo com a técnica de obturação empregada: híbrida de Tagger ou com auxílio do sistema ultrassônico. A verificação da obturação endodôntica, junto à cavidade de reabsorção interna, foi feita por meio da tomada radiográfica com dois tipos de incidência: mesiodistal e vestibulolingual. Para a análise da área de obturação, foi empregado o programa Image Tool®. Os dados obtidos da obturação foram submetidos à análise estatística por meio do Teste t de Student, com nível de significância de 5%. Resultado: Não houve diferença estatística entre as técnicas de obturação testadas. Apenas pôde-se observar diferença significativa nos dentes obturados com auxílio do ultrassom, quando se comparou a incidência radiográfica realizada no sentido mesiodistal com a vestibulolingual. Conclusão: As duas técnicas de obturação testadas foram similares no preenchimento da cavidade de reabsorção interna.

To analyze the time required to dissolute the pulp tissue under different methods of sodium hypochlorite activation. Material and methods: 30 bovine pulp fragments, with an approximate volume of 45 ± 5 mg were divided into three experimental groups (n = 10). In group 1, only the fragments were immersed in 15 ml of 2.5%sodium hypochlorite. In group 2, the irrigant was manually stirred with an endodontic instrument type K size 40. In group 3, we used the ultrasonic insert n.39, driven by ultrasound device Jet Sonic Total. The time required for total dissolution of bovine tissue was measured and recorded for statistical analysis. Results and Conclusion: According to analysis of variance (Anova), with p<0.05, Group 1 showed significantly higher dissolution time than Groups 2 and 3. Moreover, no difference between the use of ultrasound and manual activation of the irrigating solution was found.

The present study aimed to examine the correlation between atmospheric temperature and the occurrence of irreversible pulpitis. Material and methods: Data was collected from the Department of Dentistry, Moinhos de Vento Hospital, Porto Alegre between July 2011 and December 2012. A total of 52 pulpitis clinical cases were examined in 529 days in this study. Data on the atmospheric temperature in Porto Alegre on each day was collected from the Porto Alegre Meteorology Institute. Results and Conclusion: Correlation analysis of the temperature data and pulpitis cases was conducted using Student’s t-test, with a significance level of 5%. Although no correlation was observed between the occurrence of irreversible pulpitis and atmospheric temperature, the incidence rates were higher on days when the average temperature was greater than 25ºC.

Introduction and Objective: The present study aimed to examine the correlation between atmospheric temperature and the occurrence of irreversible pulpitis. Material and methods: Data was collected from the Department of Dentistry, Moinhos de Vento Hospital, Porto Alegre between July 2011 and December 2012. A total of 52 pulpitis clinical cases were examined in 529 days in this study. Data on the atmospheric temperature in Porto Alegre on each day was collected from the Porto Alegre Meteorology Institute. Results and Conclusion: Correlation analysis of the temperature data and pulpitis cases was conducted using Student's t-test, with a significance level of 5%. Although no correlation was observed between the occurrence of irreversible pulpitis and atmospheric temperature, the incidence rates were higher on days when the average temperature was greater than 25ºC.