Refinement influence in the cleaning efficacy of rotary nickel-titanium Mtwo ® instruments in oval-shaped canals by means of optical microscopy.

Objective: This study evaluated the cleaning efficacy of the rotary nickel–titanium Mtwo® by means of optical microscopy in oval‑shaped root canals and compared refinement influence using ultrasonic files or Hedströem files. Materials and Methods: Twenty mandibular incisors were accessed, included in epoxy resin blocks, and cut transversely at 3, 6, and 9 mm from the apex. Teeth were instrumented using rotary nickel–titanium Mtwo. Digital images of the root cross sections were obtained before and after instrumentation with a digital camera attached to an optical microscope. Subsequently, samples were randomly divided into two groups for refinement. Group I was refined using ultrasonic files #30 and group II with Hedströem files #30. Final digital images of cross sections after refinement were captured and analyzed. The boundaries for the uninstrumented perimeter were measured by the software ImageTool 3.0. The data obtained were statistically analyzed by analysis of variance (ANOVA) and t‑test. Results: Mtwo instrumentation produced 41.48% of the uninstrumented perimeter. The final refinement using Hedströem and ultrasonic files decreased the uninstrumented perimeter. Significant differences (t‑test, P = 0.00) were found at the three thirds after the final refinement, except for the apical third that was enhanced by Hedströem file. However, there was no statistical difference between the two refinement techniques used (P > 0.05). Mtwo instrumentation was not capable of cleaning and shaping the entire perimeter of the root canals walls. Conclusions: The final refinement, either with ultrasonic files or with Hedströem files, resulted in significantly less uninstrumented perimeter.

Furcal-perforation repair with mineral trioxide aggregate: Two years follow-up.

Furcal perforations are significant iatrogenic complications of endodontic treatment and could lead to endodontic failure. Mineral trioxide aggregate (MTA) has been regarded as an ideal material for perforation repair, retrograde filling, pulp capping, and apexification. This case report describes a furcal perforation in a maxillary first molar, which was repaired using MTA. The tooth was endodontically treated and coronally restored with resin composite. After 2 years, the absence of periradicular radiolucent lesions, pain, and swelling along with functional tooth stability indicated a successful outcome of sealing the perforation using MTA.

Tratamento endodôntico de dentes decíduos III. Emprego do paramonoclorofenol canforado como curativo intracanal / Endodontic treatment of deciduous teeth. III. Use of camphorated paramonochlorophenol as intracanal medication

No presente estudo, foi realizado tratamento endodôntico em 23 dentes decíduos com polpa mortificada, utilizando como curativo intracanal o PMCC. Os dentes foram submetidos aos exames clínico e radiográfico: no ínicio do tratamento, quando da realizaçäo do curativo intracanal: aos 7 dias, no ato da obturaçäo dos canais e nos períodos de preservaçäo de 6 a 12 meses. Com base nos resultados obtidos, foi constatado que a porcentagem de sucesso clínico para os dentes fistulados foi de 87,50 por cento e de 83,33 por cento para os näo fistulados. Radiograficamente a cura completa ou desaparecimento total da lesäo radiográfica foi de 50 por cento, a parcial de 43,75 por cento e em 6,25 por cento houve progressäo da lesäo

Dens invaginatus: tratamento endodôntico em uma sessäo / Dens invaginatus: endodontic treatment in a single session

Apresentaçäo de um caso clínico de ®Dens invaginatus¼, que recebe tratamento endodôntico convencional em uma sessäo

Presença de detritos na regiäo apical de dentes de cäes após o preparo biomecânico com ou sem o emprego de substância auxiliar cremosa / Presence of debris in the apical portion of dogs' teeth after root canal preparation by using or not using a cream as an auxiliary substance

Foi objetivo deste trabalho observar se o emprego de substância cremosa, como auxiliar do preparo biomecânico, contribui ou näo para a condensaçäo de detritos na regiäo apical do canal radicular. Para tanto, dentes de cäes foram preparados biomecanicamente usando ou näo o creme endo-PTC. Concluído o preparo dos canais, o animal foi sacrificado e as peças, coletadas para estudo, preparadas para análise histológica. A análise dos resultados evidenciou que o uso do Endo-PTC durante o preparo biomecânico determina maior frequência de condensaçäo de detritos na regiäo apical do que o grupo experimental onde essa substância näo foi empregada