ABSTRACT
BACKGROUND: In anesthetic techniques, touching bones can cause needle bending. Theoretically, a needle should support such deflection without fracturing. However, it is possible that a needle may fracture depending on the quality and type of needle used. This study evaluated the physical, chemical, and micromorphological characteristics of long and short dental anesthetic needles, as well as the mechanical properties of flexural load and bending resistance when needles are subjected to different bending angles. METHODS: Long and short needles (30G, Jets, Misawa, Selekto, Terumo, Unoject and 27G, Dencojet, Injex, Jets, Misawa, Procare, Setoject XL, Terumo) were evaluated. Scanning electron microscopy was used to evaluate the needle bevels and energy-dispersive X-ray spectroscopy was used for the chemical analysis of needle compositions. Flexural loading and bending strength assessments were performed using a universal testing machine by bending the needles (n = 5) to angles of 30°, 60°, or 90°, or until fracture occurred. RESULTS: The Injex 27G, Jets 27G, and Septoject XL 27G needles were all less than 30 mm in length. There were small percentage variations in the chemical compositions of the needles. Superior smoothness was observed for the Unoject 30G needle, which exhibited the highest fracture resistance at 60°. The Jets 30G needle exhibited greater resistance to fractures at 90°. The Procare 27G needle exhibited the highest load resistance to bending, followed by the Septoject XL 27G needle, and both needles were tied for the lowest fracture resistance. No needle fractured when bent to 30° or at less than three bends to 60° or 90°. CONCLUSIONS: Greater needle resistance to bending increases the probability of early fracturing. Thinner and shorter needles are more resistant than longer and thicker needles. Performing a single bend does not result in any significant risk of fracture or obliterate the lumen, allowing for the continued passage of anesthetic liquid.
ABSTRACT
Objetivo: apresentar um caso clínico de paciente com cisto ósseo solitário em mandíbula e sua evolução após o tratamento de exploração e curetagem cirúrgica por meio de achados radiográficos. Caso clínico: paciente do sexo masculino, 45 anos, compareceu à clínica da Faculdade de Estudos Administrativos Fead. Ao exame clínico, os tecidos se apresentavam dentro dos padrões de normalidade e ao exame radiográfico observou-se área radiolúcida unilocular, limites regulares e bem definidos em região anterior de mandíbula entre ápices dos dentes 33, 32, 31, 41 e 42, sem deslocamento desses. Para confirmação do diagnóstico, além do exame clínico, foi necessário realizar a tomografia de feixe cônico e exploração cirúrgica. Após a exploração cirúrgica foi realizada a curetagem das paredes ósseas e a proservação do caso para acompanhar a sua evolução. Considerações finais: por ser uma lesão de comportamento não agressivo, responde bem a este tipo de tratamento, sendo notável sua melhora durante o período de acompanhamento.(AU)
Objective: To present a clinical case report of a patient with solitary bone cyst of the mandible and its evolution after exploration and surgical curettage treatment through radiographic findings. Case report: A 45-year-old male patient attended the clinic of the School of Administrative Studies - FEAD. The clinical examination showed normal tissues and the radiographic examination showed unilocular radiolucent area and regular and well-defined boundaries in the anterior mandible between the apexes of teeth 33, 32, 31, 41, and 42, without displacement. To confirm the diagnosis, in addition to the clinical examination, cone beam tomography and surgical exploration were required. After the surgical exploration, bone wall curettage and case proservation were performed to monitor the evolution. Final considerations: Considering it is a non-aggressive lesion, it responds well to this type of treatment, with considerable improvement during follow-up.(AU)