Australian Endodontic Journal最新文献

This study aimed to assess the antibiotic prescribing pattern for endodontic infections among general dental practitioners (GDPs) and endodontic specialists in Malaysia. A 22-questions survey on demographic and general information on antibiotic prescribing patterns for endodontic infection was delivered to the email addresses of general dentists and specialists via the Dental Practitifoner Information Management System database. Collected data were analysed using multivariate logistic regression tests at the significance level of 0.05. A total of 372 responses were collected. 94% of respondents were GDPs, and 6% endodontists. Clinical experience and frequency of endodontic treatment performance were the significant factors in prescribing antibiotics (p < 0.05). The common reasons for antibiotic prescription were to control the spread of infection and fever (88%). Endodontists have better knowledge of antibiotic prescription than GDPs. The majority of GDPs had inappropriately prescribed antibiotics. Improving the knowledge of GDPs in Malaysia regarding antibiotics-indications in endodontics is mandatory.

This case report describes a successful autotransplantation procedure for an impacted mandibular left second premolar with incomplete root formation. Despite caries and root resorption, the patient's mandibular left second primary molar was retained. Furthermore, the severe impaction of the mandibular left second premolar ruled out orthodontic realignment. Due to the young age of the patient, dental implantation was not feasible, leading to the selection of autotransplantation as the preferred method for replacing the retained primary molar. To address the insufficient buccolingual width of the recipient site, a combination of piezosurgery-assisted alveolar ridge splitting and guided bone regeneration techniques was employed in this autotransplantation procedure.

The use of rotary file in permanent teeth is well-documented, but there is limited scientific evidence for its effectiveness in primary teeth. A meta-analysis was conducted to compare rotary and manual tools in primary tooth pulpectomy procedures. Ten databases were searched from 2000 to 2024 to find relevant literature. The Cochrane Risk of Bias (ROB) tool assessed bias in randomised control trials. STATA software version 18 conducted the meta-analysis. A random-effects model was used for instrumentation time and obturation quality evaluation while sensitivity analysis followed high heterogeneity detection. Twenty RCTs were included after screening 723 studies. Publication bias and heterogeneity were found for instrumentation time, leading to removal of nine studies. Significant difference in mean instrumentation time (1.42) was noted. Obturation quality assessment showed an odds ratio of 1.82. Use of rotary instrumentation yielded superior outcomes compared with manual instrumentation for pulpectomy for primary teeth.

This study assessed the usability of ultrasonography in detecting root canal perforations. The buccal side of incisor root were perforated. The actual lengths up to the perforation site were measured by visualisation of the tip of a file. Specimens were embedded in gypsum, and it was scraped to simulate bone resorption. Resorption cavities were filled with ultrasound gel. Measurements were taken by advancing a file through the canal until the tip became visible in the ultrasound image. 3D scans were obtained using cone-beam computed tomography (CBCT) and the distance between the coronal point of the resorption cavity and the reference point was measured. The actual distance of the resorption cavity from the reference point varied 6-10.6 mm. The same distances were measured via ultrasound as 5.7-10.9 mm, while measured using CBCT 6-10.5 mm. No significant differences were found. Ultrasonography shows promise for detecting root perforations, however further research is needed.

This study evaluated the glass fibre post (GFP) removal using three different protocols with ultrasonic tips. Thirty-six extracted single-rooted teeth were endodontically treated and cemented with a 10-mm GFP. Three protocols were used for GFP removal: 20 s activated with cooling, 20 s activated without cooling and 40 s activated without cooling. The removal time and temperature increase on the external root surface were recorded. The amount of residual material and the volume of dentin loss were assessed using micro-computed tomography. Data were analysed using ANOVA with a 5% significance level. The removal time and the amount of residual material were not affected by the protocol. There was no difference in temperature increase between the 20-s groups. The 40s activated without cooling produced the highest temperatures, especially in the apical region, and greater dentin loss. It is not advisable to use the ultrasonic insert continuously for more than 20 s.

To establish an acid-etching protocol for Biodentine and Cimmo DTA, evaluating compressive strength, bond strength, surface morphology in scanning electron microscope and failure modes after different etching times. Two test specimens were prepared for each cement and divided into four groups (n = 12) according to the acid-etching time (0, 5, 10 and 15 s). Compressive strength was tested using a universal testing machine, while bond strength was evaluated after bonding with Filtek Bulk Flow resin using Universal ESPE Single Bond adhesive. Failures were classified as surface-adhesive, cement-cohesive, resin-cohesive and mixed. Biodentine showed significantly higher compressive strength than Cimmo DTA (p < 0.001), regardless of acid etch time (p < 0.001). Different acid-etching strategies are required for Biodentine and Cimmo DTA, with Biodentine requiring selective etching and Cimmo DTA requiring a full 15-s etch to optimise bond strength properties.

This study aimed to evaluate the relationship of incidence between radix entomolaris (RE) in permanent mandibular first molars (FM) with C-shaped canal (CSC) in permanent mandibular second molars (SM). A total of 1015 cone-beam computed tomography (CBCT) images of permanent mandibular molars from Malaysian patients were collected retrospectively and analysed by researchers from seven dental schools in Malaysia trained in CBCT technology. The presence and absence of RE and CSC were scored as 'yes' or 'no'. The prevalence of FM with RE was 21.2% and SM with CSC was 37.9%. The co-occurrence of RE and CSC in the same quadrant was 6.5% (OR = 1.497, p = 0.014). Female, Chinese and samples from Eastern Peninsular Malaysia were associated with CSC in SM (p < 0.05). The increased appearance of CSC in SM when RE is present in FM makes it imperative for clinicians to be vigilant during examination and diagnosis to prevent potential endodontic mishaps.

This study assessed the influence of root canal treatment quality on the architecture of periapical lesions. A total of 121 lesions were involved in this research. Two researchers analysed the surface of the lesions, diameters in three planes, volume and sphericity. The quality of root canal treatment was assessed with PESS index. Non-parametric statistical tests: Mann-Whitney and Spearman rank correlation coefficient were used in this research. Connected lesions of multirooted teeth spread in the coronal plane revealed a positive correlation with coronal seal and root canal filling homogenicity, however their spread in the sagittal plane showed a positive correlation only with root canal filling homogenicity. The quality of root canal treatment has an influence on the periapical lesions' architecture.

Medication-related osteonecrosis of the jaw (MRONJ) is a progressive condition that can cause significant bone loss and its diagnosis can be challenging. A 68-year-old man with a diagnosis of hepatocellular carcinoma, undergoing treatment with atezolizumab, bevacizumab and zoledronic acid, complained of spontaneous pain in the right lower second premolar. Oral examination revealed no dental changes and implants in the right jaw. A patient history and thorough clinical and radiographic examinations mimic endodontic disease. The implant crowns were removed, bleeding on probing, and peri-implant pockets were observed. The main hypothesis was MRONJ Stage 2, and the surgical treatment was performed. The pain ceased and signs of MRONJ were not observed within 3 months. MRONJ should be considered as a hypothesis in the case of odontalgia and a patient's history of antiresorptive and antiangiogenic therapies. Furthermore, monitoring patients with dental implants in the mandible through detailed clinical and imaging evaluation is required.

This study assessed stress distribution, maximum stress values and fatigue life of experimentally designed NiTi rotary files with different cross-sectional geometry and pitch length using finite element analysis (FEA). Four cross-sectional shapes (Convex triangle, S-shaped, Triple helix and Concave triangle) and two pitch lengths (2 mm and 3 mm) were tested in simulated root canals with curvatures of 30°, 45° and 60°. The FEA results indicated that convex triangle and triple helix geometries exhibited lower stress values compared to the S-shaped and concave triangle designs. Increasing the canal curvature angle resulted in higher stress values, with the S-shaped instrument showing the most significant increase (up to 12%). Instruments with shorter pitch lengths showed more even stress distribution enhancing fatigue life. The maximum stress was concentrated 5–8 mm from the tip, varying across cutting edges, with S-shaped sections experiencing the lowest forces but higher stress due to lower moments of inertia.