Limitations and Management of Static-guided Endodontics Failure.

Endodontic treatment in severely calcified canals is always a challenging task because it can result in accidents such as deviations or perforations. Recently, guided endodontics has become an alternative approach for pulp canal calcification, facilitating the location of root canals more predictably through the combined use of cone-beam computed tomographic imaging, oral scanning, and endodontic access guides. Although several reports have shown that guided endodontics is safer, faster and can be performed without an operating microscope and by less experienced operators, the technique has limitations, and iatrogenesis may occur. This article describes the limitations of static-guided endodontics and possible causes of failures. In the present case, not fixing the guide to the bone and inaccuracies generated by manually performing mesh merger software led to root perforation. Endodontic microsurgery was effective in resolving this case and should be considered the treatment of choice when guided endodontics cannot be used safely or when it fails.

Push-out bond strength and marginal adaptation of apical plugs with bioactive endodontic cements in simulated immature teeth.

OBJECTIVES: This study evaluates the bond strength and marginal adaptation of mineral trioxide aggregate (MTA) Repair HP and Biodentine used as apical plugs; MTA was used as reference material for comparison. MATERIALS AND METHODS: A total of 30 single-rooted teeth with standardized, artificially created open apices were randomly divided into 3 groups (n = 10 per group), according to the material used to form 6-mm-thick apical plugs: group 1 (MTA Repair HP); group 2 (Biodentine); and group 3 (white MTA). Subsequently, the specimens were transversely sectioned to obtain 2 (cervical and apical) 2.5-mm-thick slices per root. Epoxy resin replicas were observed under a scanning electron microscope to measure the gap size at the material/dentin interface (the largest and smaller gaps were recorded for each replica). The bond strength of the investigated materials to dentin was determined using the push-out test. The variable bond strengths and gap sizes were evaluated independently at the apical and cervical root dentin slices. Data were analyzed using descriptive and analytic statistics. RESULTS: The comparison between the groups regarding the variables' bond strengths and gap sizes showed no statistical difference (p > 0.05) except for a single difference in the smallest gap at the cervical root dentin slice, which was higher in group 3 than in group 1 (p < 0.05). CONCLUSIONS: The bond strength and marginal adaptation to root canal walls of MTA HP and Biodentine cement were comparable to white MTA.

The use of antimicrobial photodynamic therapy in the successful management of a nonsurgical complex type II Dens Invaginatus.

Because of its complex root canal morphology, dens invaginatus (DI) is a developmental anomaly that represents an endodontic challenge to complete cleaning, shaping, and disinfecting the root canal system. The present case report describes the use of antimicrobial photodynamic therapy as an adjunctive treatment in the successful management of nonsurgical complex type II DI in a left maxillary lateral incisor with thin and fragile dentin walls associated with periradicular lesion.

The use of antimicrobial photodynamic therapy in the successful management of an invasive cervical resorption class 4: A case report with five years follow-up.

A 41-year-old male with a dental history of invasive cervical resorption (ICR) was initially treated with a surgical endodontics approach and secondly with antimicrobial photodynamic therapy (aPDT) along with endodontic retreatment. The use of aPDT was essential to promote bacterial reduction in the resorption defect. Combining these techniques allowed for clinical, radiographic, and tomographic success after five years of follow-up.

Use of technology in endodontics by undergraduate dental students in a south-eastern state of Brazil.

INTRODUCTION: This study aimed to determine the level of incorporation of current technologies for endodontic treatment in undergraduate dentistry courses in a south-eastern state of Brazil. METHODS: For data collection, a self-assessment-based online questionnaire was created using the "Google Forms" platform, consisting of 12 multiple-choice and a few open-ended questions. The questions were related to the use of current technologies for diagnosis, imaging, use of ultrasonics in endodontics, instrumentation, use of apex locator, microscopy, photodynamic therapy and thermoplastic techniques during endodontic treatment. The questionnaire was sent to 54 dental schools in Minas Gerais. RESULTS: The results show low technological incorporation during the various stages of endodontic treatment by undergraduate students in dentistry courses in Minas Gerais. CONCLUSION: Despite the availability of several technologies to help perform different stages of endodontic treatment, it was observed that most universities do not teach the use of these technologies. Additional studies are needed to correlate how the lack of incorporation of these technologies could impact on the quality of the endodontic learning for undergraduate students.

Tratamento endodôntico de segundo molar inferior com presença de canal mesiomediano: relato de caso / Endodontic treatment of second mandibular molar with presence of middle mesial canal: case report

Introdução: A identificação de possíveis variações anatômicas é decisiva para o correto diagnóstico e planejamento da terapia endodôntica. Objetivo: Relatar o tratamento endodôntico de um dente #37, no qual foi identificado um terceiro canal na raiz mesial (canal mesio-mediano, CMM). Caso clínico: Dente #37 com diagnóstico de pulpite irreversível sintomática, foi encaminhado para realizar tratamento endodôntico. Durante o acesso coronário, e com auxílio de microscópio operatório (MO), foram identificadas trincas coronárias. Foi solicitada uma tomografia computadorizada de feixe cônico (TCFC), a partir da qual foi descartada a presença de trinca radicular. A TCFC possibilitou, também, identificar a presença de um terceiro canal na raiz mesial, localizado entre os canais mesiovestibular e mesiolingual. O tratamento endodôntico foi executado pelo sistema reciprocante WaveOne GOLD. A solução irrigadora de escolha para o preparo químico-mecânico foi o hipoclorito de sódio a 5,25%. Imediatamente antes da obturação, os canais foram irrigados com EDTA a 17%, para auxiliar na remoção da smear layer e, em seguida, foi realizada nova irrigação com hipoclorito de sódio a 5,25%. Os canais foram secos com pontas de papel absorvente e obturados pela técnica de onda contínua de condensação. Resultados: Os canais radiculares do dente #37 foram devidamente instrumentados e obturados. A paciente não apresentou qualquer sintomatologia pós-operatória, sendo encaminhada para a reabilitação protética final. Conclusão: A TCFC e o microscópio operatório foram decisivos para o correto planejamento do caso, tanto em relação à trinca observa- da quanto à detecção do canal mesiomediano (AU).

Introduction: Identification of possible anatomical variations is crucial for the correct diagnosis and planning of endodontic therapy. Objective: To report the endodontic treatment of tooth #37, in which a third canal was located in the mesial root (middle mesial canal - MMC). Methods: Tooth #37 was diagnosed with symptomatic irreversible pulpitis and referred for endodontic treatment. Coronary cracks were found during coronal access using a dental operating microscope (DOM). A cone-beam computed tomography (CBCT) was requested. CBCT revealed cracks involving the pulp chamber floor and a third root canal in the mesial root, between the mesiobuccal and the mesiolingual canals. Endodontic treatment was performed with the WaveOne GOLD reciprocating system. The chemical-mechanical preparation was performed with 5.25% sodium hypochlorite and 17% EDTA to remove the smear layer, followed by another irrigation with sodium hypochlorite. The canals were dried with absorbent paper points. The root canal obturation was performed with the continuous wave of condensation technique. Results: The root canals of tooth #37 were correctly instrumented and obturated. The patient did not present with any postoperative symptoms, and was referred for final prosthetic rehabilitation. Conclusion: CBCT and DOM were paramount for the correct planning of the case, as regards the presence of cracks and the detection of the middle mesial canal (AU).

Antimicrobial photodynamic therapy and guided endodontics: A case report.

A 35-year-old woman with a history of pulp canal obliteration (PCO) and apical periodontitis was treated with guided endodontics combined with antimicrobial photodynamic therapy (aPDT). The use of aPDT was paramount to the approach performed, and its application should be encouraged in cases of severely calcified canals when apical patency is unachievable. The combination of these techniques ensured successful clinical, radiographic, and tomographic outcomes at the 1-year follow-up. Key Words: Antimicrobial PDT, guided endodonics, periodontitis, pulp canal obliteration.

Terapia fotodinâmica na endodontia: revisão de literatura / Photodynamic therapy in endodontics: review of literature

Objetivo: O presente estudo objetiva discutir os principais fatores que envolvem a terapia fotodinâmica e suautilização no tratamento endodôntico por meio de uma revisão de literatura. A persistência de microrganismosremanescentes ao preparo químico-mecânico ou a medicação intracanal está relacionada como a principal causa de insucesso na endodontia. Revisão de Literatura e Considerações finais: A terapia fotodinâmica desponta como uma promissora terapia antimicrobiana, sendo utilizada como coadjuvante ao tratamento endodôntico. Consiste numa técnica de fácil e rápida aplicação, que pode ser utilizada em sessão única ou múltiplas sessões, não desenvolvendo formas de resistência microbiana