Australian Endodontic Journal最新文献

This study evaluated the performance of MTA and ready-to-use cement (Bio C Repair) in dentine repair under different blood contamination conditions. 120 bovine root dentine-disks were divided into control and blood-contaminated groups and then subdivided on the basis of cement type and exposure time (immediate or 15-min delay). The control was stored in a humid environment at 37°C for 28 days, whereas the contaminated group was stored in blood. Push-out bond strength was assessed using a universal testing machine (1 mm/min). Three samples per subgroup underwent EDS-X and SEM analysis. MTA exhibited significantly lower bond strength than Bio C Repair (p < 0.001). Samples exposed to blood showed significantly lower bond strength than controls (p < 0.001). The 15-min delay reduced bond strength only in Bio C Repair samples (p = 0.045). It can be concluded that blood contamination reduced bond strength, with the ready-to-use material demonstrating superior performance compared to the conventional bioceramic cement.

This study aimed to investigate the stress distribution on dentine, supporting tissues and restorative materials in simulated tooth models with various sized internal resorption cavities obturated with gutta-percha, MTA or Biodentine. A 3D finite element model was developed using Wheeler's dental atlas. The cortical and trabecular bone, lamina dura, and periodontal ligament were modelled. A healthy tooth served as the control, while the other models featured internal resorption cavities of various sizes in the middle third. In the treated models, the resorption cavities were restored with gutta-percha, MTA or Biodentine; the apical and coronal thirds were filled with gutta-percha. Seventeen models were subjected to a 100 N force at a 135° angle. Stress increased with resorption size but decreased after treatment. Gutta-percha models showed the highest stress on dentine and bone, while Biodentine had the lowest. However, Biodentine accumulated the most stress within the material. Larger resorption cavities increased stress, while Biodentine and MTA transmitted less stress to dentine than gutta-percha.

The objective of this study was to investigate the effect of different incubation periods on the push-out bond strength and microhardness of calcium-silicate-based materials: MTA-Angelus, Biodentine and BIOfactor MTA. A total of 100 dentine discs were used for the push-out test. Three cavities were prepared on each dentine disc. Each cavity on the same disc was filled with MTA-Angelus, Biodentine or BIOfactor MTA. Half of the dentine samples were incubated at 37°C for 1 day, and the other half for 28 days (n = 50). Push-out testing was then performed. For the microhardness test, material discs were prepared by mixing the materials and placing them into Teflon moulds (n = 26). The samples were incubated at 37°C for either 1 day or 28 days (n = 13). Vickers microhardness testing was conducted. The data were statistically analysed. The results showed that Biodentine exhibited the highest bond strength and microhardness at both time points, while MTA-Angelus showed the lowest (p < 0.05). Overall, Biodentine demonstrated superior performance, while BIOfactor MTA showed promising but moderate results.

This study aimed to evaluate the influence of a new multifunctional single endodontic irrigant on the push-out bond strength and adhesive interface between gutta-percha and an epoxy resin-based sealer and root dentine. Forty-eight human maxillary canines were randomly assigned to four irrigation protocols (n = 12): NaOCl 2.5% + EDTA 17% + saline (SHE), Triton solution + saline (T), Triton solution + EDTA 17% + saline (TE) and NaOCl 2.5% + Triton solution + saline (SHT). Root canals were prepared with the WaveOne Gold Large system and obturated using a single WaveOne Large cone with AH Plus sealer. The SHE group showed the highest bond strength (4.87 ± 0.84 MPa), significantly higher than those of the other groups (p < 0.001). Scanning Electron Microscopy (SEM) revealed better adaptation in SHE, whereas T, TE and SHT exhibited gaps. The new irrigant resulted in lower bond strength and poorer adaptation of the adhesive interface.

There is limited clinical information regarding the efficacy and safety of laser treatment in endodontics and dentistry. This comprehensive literature review discusses the clinical efficacy, advantages and limitations of laser use in these fields. Carbon dioxide (CO₂), diode, erbium-doped yttrium aluminium garnet (Er: YAG), Er, Chromium (Cr): YAG, and neodymium (Nd): YAG lasers have been used in endodontic treatments. Laser technology has revolutionised endodontic treatment by enhancing disinfection, promoting healing, facilitating root canal treatment, improving canal shaping and decreasing pain associated with endodontic treatments. General dental care has improved by laser advancements in drilling, preparing cavities, reshaping the gingiva, teeth bleaching, addressing periodontal disease and diagnosis. Their high precision results in minimal disruption of adjacent tissues, which in turn minimises bleeding, decreases patient discomfort, and accelerates recovery times. Further clinical randomised studies are required to compare laser treatments with conventional methods, particularly in the context of cost-effectiveness.

This systematic review investigates the clinical use of bioceramic materials in retrograde apicectomy, a surgical endodontic procedure aimed at managing persistent periapical pathology. The review follows the PRISMA 2020 guidelines and is registered in PROSPERO (CRD420251022135). Comprehensive searches were conducted in PubMed, Scopus, and Web of Science from January 2000 to December 2024. Studies were included if they were human clinical trials evaluating bioceramic materials in retrograde apicectomies with a minimum follow-up of 6 months. Data extraction included sample size, material type, healing outcomes, and complications. Nineteen studies met the inclusion criteria. Findings indicated that bioceramics demonstrated superior sealing ability, biocompatibility, and osteoconductive properties compared to traditional materials such as amalgam or IRM. The analysis highlights the effectiveness of mineral trioxide aggregate (MTA) and newer formulations such as bioceramic putty and premixed hydraulic silicate cements. Bioceramics are positioned as a promising standard in apical surgery, though further long-term controlled studies are warranted.

To evaluate the diagnostic performance of artificial intelligence (AI) in detecting root canal orifices using images captured with a dental operating microscope (DOM). A total of 80 human maxillary first and second molars were included in the study. After preparing traditional access cavities, root canal orifices were identified under a dental operating microscope (DOM) at 21.25× magnification. Following orifice identification, video recordings were obtained using the DOM, from which a total of 1527 frames were randomly selected for analysis. The root canal orifices in these frames were manually labelled using CranioCatch labeling software (CranioCatch, Eskişehir, Turkey). In the binary classification task, the system correctly identified 502 out of 526 root canal orifices, yielding an accuracy of 91%. The YOLO-based CNN demonstrated high accuracy and sensitivity in detecting root canal orifices from DOM images.

A 57-year-old patient with temporomandibular disorder and toothache underwent root canal treatments on teeth 42–31 by an endodontist. Despite these treatments, the patient experienced persistent pain radiating to his ears and sought evaluation by another endodontist. No notable facial or intraoral swelling nor paresthesia was observed; however, he reported difficulty with swallowing and trismus. A large periapical radiolucent lesion was identified spanning from tooth 42 to 32, and root resorptions were observed at the apices of teeth 42, 41 and 31. The initial diagnoses for teeth 42, 41, and 31 were previously treated and symptomatic apical periodontitis. Root-end surgery with biopsy was performed. One month later, the biopsy results revealed the lesion to be a carcinoma. The patient was immediately referred to a cancer centre, where a definitive diagnosis of adenoid cystic carcinoma was made. A prompt biopsy is critical for the definitive diagnosis of malignancies for timely treatment.