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Osteosarcomas of the jaws (OSJ) are difficult to diagnose, rare malignant lesions, with uncharacteristic radiographic and clinical presentation. Early diagnosis and treatment are essential to improve long-term prognosis. The current report presents a rare case of a primary conventional osteoblastic osteosarcoma of the anterior maxilla in a 25-year-old female. She presented to a private dental clinic after developing pain, facial oedema and palpation tenderness of a mass associated with the upper right lateral incisor. The signs and symptoms mimicked very closely a regular radiolucent and symptomatic periapical pathology, and the definitive diagnosis was only possible through a combination of clinical, radiographic and histopathological findings. The patient was referred to an oncology facility, where she was submitted to radical excision surgery through a hemi-maxillectomy. Although other pathologies are uncommon, the differential diagnosis of lesions compatible with odontogenic periapical pathology should not be neglected.

Dens invaginatus is an uncommon occurrence in the permanent dentition. However, practitioners must be aware of this anatomical variation, as an early diagnosis may prevent the need for endodontic treatment. Clinically, root canal treatment of Oehler's Type II dens invaginatus may present a complex challenge. This paper reports two cases of non-surgical endodontic treatment and one case of non-surgical endodontic retreatment of upper lateral incisors diagnosed with Oehler's Type II dens invaginatus. All procedures were done maintaining the original anatomy of both the invagination and the root canal space to minimize dentin elimination. At follow-up appointments, resolution of apical pathosis was noted in all three cases, with no sign of structural strain. With the help of dedicated instruments, such as ultrasonic tips, and under magnification, the conservation of the invagination in Oehler's Type II dens invaginatus is a valid and successful treatment option. (Rev Port

Objective: The traditional face-to-face or on-site lecturing methods are still among the most common forms of delivering knowledge to students in dental education. However, other innovative learning methodologies have the potential to complement, or even improve, the effectiveness and quality of teaching. The aim of this online survey was to analyze the receptivity of endodontics practitioners to a specific online teaching format of a multi-day congress, mimicking an on-site conference, and perceive whether the participants regarded it as an effective way of acquiring knowledge with application in their clinical practice activity. Methods: An online questionnaire, composed of 17 items, was sent during the last day of a multi-day online congress. Four strands of information were taken into account: demographics; previous online formation experience; personal involvement in the underway online congress; and overview of the online congress concept. Participation was voluntary and anonymous. Total counts, frequencies and descriptive statistics were generated by using SurveyMonkey software. Results: A total of 1.827 answers were delivered, which represented a return rate of 15.8%. The results indicated that most of the participants agree that online learning could be a good alternative to the traditional on-site learning methodology in improving their practical abilities. In addition, the present survey found that the majority of the attendees support the use of computers as an assisting tool and only 18.0% reported difficulties when using technologies. A high number of practitioners recognized a favourable cost-benefit ratio of using online lessons and stated they would recommend others to participate in online meetings as well. Conclusion: Overall, the present results suggest that online learning may be used successfully to improve student’s knowledge and enhance their abilities to apply acquired content in clinical situations. Moreover, the participants felt online learning to be effective, engaging and with a favourable cost-benefit ratio.

Internal root resorption is characterised by progressive loss of tooth substance initiating at the root canal wall as a result of clastic activity. This report describes a case of a perforating internal root resorption on a maxillary central incisor in a 25‐year‐old patient. The perforating internal root resorption was firstly diagnosed with periapical radiographs and assessed with full detail with the aid of CBCT, allowing determination of the extension and areas involved in the resorption lesion, as well as the treatment planning. According to these findings, a MTA barrier was performed on the root, ‐coronally to the resorption lesion, leaving the root apically to the resorption lesion untouched. Clinical findings and periapical radiographs indicated complete resolution of the radiolucency associated with the resorptive defect, with reestablishment of lamina dura along the root and occlusion of the lumen of the root canal in the apical segment, after a 5‐year follow‐up.