Restorative Dentistry & Endodontics最新文献

Objectives: This study aimed to assess the effect of cross-section geometry on the mechanical properties of nickel-titanium (NiTi) instruments by comparing two instruments with identical tip size, taper, and thermal treatment but differing in cross-section design.

Methods: One hundred four NiTi rotary instruments, being S-shaped and triangular cross-section, manufactured with Blueish thermal treatment, were tested (n = 52 per group). Differential scanning calorimetry was employed, and the metal mass volume and cross-section area were assessed. The cyclic fatigue, torsional, and bending resistance tests were assessed. Data were analyzed using the Kolmogorov-Smirnov and Student t tests, and the level of significance was set at 5%.

Results: The instruments exhibited similar start and finish temperatures of phase transformation. The S-shaped instruments had significantly lower metal mass volume and cross-sectional area (p < 0.05). S-shaped instruments demonstrated superior cyclic fatigue resistance, greater angular deflection, and lower bending stiffness (p < 0.05).

Conclusions: Cross-section geometry significantly influences the mechanical properties of NiTi rotary instruments.

Objectives: The aim of this study is to comprehensively analyze the quality, educational value, and demographic characteristics of pre-endodontic build-up videos published on the YouTube™ platform (Google LLC).

Methods: The study was conducted on YouTube™ using the keyword "pre-endodontic build-up." The first 100 videos retrieved from the search results were reviewed, and 61 videos meeting the inclusion criteria were analyzed. After assessing the demographic characteristics of the videos, viewing rates and interaction indices were calculated. The quality of the videos was evaluated using the DISCERN instrument and the Global Quality Scale (GQS). Statistical analyses were performed on the obtained results.

Results: A total of 61 videos were analyzed, of which 56% were uploaded by endodontists. The majority of the videos were found to be of low quality. As the DISCERN score increased, video duration, number of likes, number of comments, and view rate also increased. Additionally, a significant positive correlation was observed between the DISCERN score and the GQS value (p = 0.004). The relationship between video upload sources and various parameters was analyzed, revealing statistically significant differences (p < 0.05).

Conclusions: Considering all the evaluation methods used in this study, it is evident that the number of high-quality videos is low. This finding indicates that YouTube™ does not provide sufficient information on pre-endodontic build-up. To enhance its reliability as a source of medical information, YouTube™ should prioritize content that is not only popular but also accurate and of high quality, preferably created or endorsed by professionals.

Objectives: The aim of this study was to create a rapid admixture of mineral trioxide aggregate (MTA) and silver nanoparticles (AgNPs) for chairside use in clinical settings to remediate the challenges associated with root canal treatment and pulp capping.

Methods: Synthesized AgNPs at ratios of 10 and 25% were added to commercially available MTA to create an admixture. The admixture was subjected to structural and morphological assessment using X-ray diffraction analysis (XRD), Fourier transform infrared (FT-IR) analysis, Raman spectroscopy, and scanning electron microscopy. Antioxidant activity was measured using the hydroxyl radical scavenging assay. A significance level of 0.05 was applied to determine statistical differences.

Results: The addition of AgNPs decreased the carbonate peak intensity in XRD and FT-IR. The rod-like morphology of MTA was changed to a flake-like morphology with the addition of AgNPs. Antibacterial efficacy enhanced proportionally with the augmentation of AgNPs concentration.

Conclusions: The creation of rapid admixture of MTA and AgNPs during chairside use in clinical settings can deliver beneficial characteristics of enhanced morphological features favoring mineralization and profound antibacterial effects to overcome the challenges associated with root canal treatment and pulp capping.

Objectives: This study aimed to compare the content, educational quality, and dependability of videos on Instagram, TikTok, and YouTube about pulp therapy (PT) in pediatric dentistry and endodontics.

Methods: Three popular video sites, Instagram (Meta Platforms, Inc.,), TikTok (ByteDance Ltd.), and YouTube (Google LLC), were searched for PT content to analyze for compliance with the American Association of Endodontists and American Academy of Pediatric Dentistry guidelines for clinical endodontists and pediatric dentists. The searched hashtags were #pulpaltherapy, #pulpaltreatment, #pulptherapy, and #pulptreatment. The classification of 158 English-language videos was based on several variables: communication quality, duration, likes and dislikes, views, source, treatment, and genre. The videos were evaluated using a usefulness score and the Global Quality Scale (GQS), Video Information and Quality Index (VIQI), Journal of the American Medical Association (JAMA) score, and modified DISCERN score to rate their quality and reliability. The majority of the videos were published by healthcare professionals, dental clinics, and universities.

Results: Significant relationships existed between video length, source of upload, usefulness score, tooth type, pulp status, and VIQI, JAMA, GQS, and DISCERN scores for all three platforms (p<0 .05). A statistically significant relationship existed of YouTube, TikTok, and Instagram with the number of views, number of months since upload, view rates, comments and likes (p< 0.05).

Conclusions: TikTok and Instagram reel videos provided high- to moderate-quality information about PT, especially in children, but YouTube may provide more reliable information than other social media tools.

Endodontic-periodontal lesions (EPLs) complicated by cemental tears present a diagnostic and therapeutic challenge. This case report describes the successful management of a 66-year-old male patient with a mandibular second molar (#18) exhibiting an EPL complicated by a cemental tear. Clinical examination revealed a draining sinus tract, deep periodontal pockets, and radiographic evidence of a "J-shaped" lesion and a radiopaque cemental fragment. The tooth had previously initiated endodontic treatment. A multidisciplinary approach involving endodontic treatment and surgical removal of the cemental tear was implemented. At 24-month follow-up, clinical and radiographic examination revealed significant improvement in periodontal health, bone regeneration, and resolution of the lesion. This case highlights the importance of considering cemental tears in the differential diagnosis of EPLs and demonstrates the efficacy of a combined endodontic-periodontal approach for achieving predictable outcomes.

Objectives: Endodontic retreatment aims to address treatment failure through the removal of root canal filling materials. This in vitro study evaluated the presence of filling material remnants in the mesial root canals, specifically focusing on the isthmuses, of mandibular molars after retreatment.

Methods: One hundred extracted mandibular molar mesial roots with isthmuses were prepared with an R25 file, obturated with one of five calcium silicate-based sealers (BioRoot RCS [Septodont], MTApex [Ultradent Products Inc.], EndoSequence BC Sealer HiFlow [Brasseler USA], Bio-C Sealer [Angelus]) or an epoxy resin-based sealer (AH Plus Jet [Dentsply Maillefer]), all stained with rhodamine B, and stored at 37ºC for 30 days to allow for setting. Retreatment was subsequently performed using R40 and XP-endo Finisher R instruments (FKG Dentaire) with 2.5% sodium hypochlorite irrigation. The presence of remaining filling material was then assessed using confocal microscopy, and setting times were tested per ISO 6876:2012.

Results: AH Plus Jet showed the most remnants at 2 mm and the longest retreatment time. Calcium silicate-based sealers exhibited prolonged setting times under dry conditions, with EndoSequence BC Sealer HiFlow showing a particularly extended setting period.

Conclusions: Despite retreatment, residues remained in all canals and isthmus regions, particularly Bio-C Sealer and AH Plus Jet in apical areas, emphasizing the difficulty of complete removal and the persistence of filling material.

Objectives: This study aimed to assess the influence of two endodontic sealers on the bond strength of glass fiber posts using conventional and self-adhesive resin cement through a push-out test.

Methods: Forty central human incisors were randomly divided into four groups (n = 10) based on sealer (epoxy resin- based or calcium silicate-based) and cement (conventional and self-adhesive resin) types: AH Plus (Dentsply De- Trey)/RelyX ARC (3M ESPE), AH Plus/RelyX U200 (3M ESPE), Bio-C Sealer (Angelus)/RelyX ARC, and Bio-C Sealer/RelyX U200. After canal filling and post cementation, roots were sectioned to obtain one specimen per root third. A pushout test and failure pattern assessment were conducted, with bond strength analyzed using the one-way analysis of variance and Tukey test.

Results: AH Plus/RelyX ARC showed the highest bond strength values, with a significant difference in the middle third. The most common failure was mixed (55%), while adhesive failures made up 45%, with 23.5% at the cement/post interface and 21.5% at the cement/dentin interface.

Conclusions: AH Plus/RelyX ARC provided the highest bond strength values for glass fiber posts to dentin.

Objectives: This study aimed to evaluate the influence of cone-beam computed tomography (CBCT) acquisition protocol, the presence of intraradicular metal post, and examiner experience on the detection of complete root fractures in multi-rooted teeth.

Methods: Twenty human molar teeth filled with gutta-percha were placed into artificial alveoli created in bovine ribs. The sample was divided into two groups based on the presence or absence of intraradicular posts in the distal roots. CBCT scans were obtained using four acquisition protocols with varying voxel sizes (0.28, 0.2, 0.125, and 0.80 mm). Following the creation of controlled fractures using a chisel and hammer, CBCT imaging was repeated, resulting in 160 images. Five examiners assessed the images using OnDemand software (KaVo Dental GmbH). Sensitivity, specificity, and accuracy were calculated for each examiner, CBCT protocol, and post-condition. Statistical comparisons were performed using Cochran's Q test and McNemar test, and a significance level of 5%.

Results: In teeth without metallic posts, sensitivity, specificity, and accuracy values exceeded 0.70, 0.70, and 0.80, respectively. However, the presence of metallic posts significantly reduced diagnostic performance, particularly in low-resolution protocols evaluated by less-experienced examiners.

Conclusions: CBCT acquisition protocols should be selected based on the presence of metallic posts to optimize root fracture detection in multi-rooted teeth. Examiner experience also plays a critical role in diagnostic accuracy.

Objectives: This study aimed to measure the dentin thickness of C-shaped canals in mandibular first and second premolars at coronal, middle, and apical root levels using cone-beam computed tomography (CBCT).

Methods: Dentin thicknesses of buccal, lingual, mesial, and distal root walls of 41 C-shaped premolars were measured at three different root levels on axial CBCT slices. The measurements were made at the midpoint of each third, along with 1 mm below and above the midpoint. C-shape configurations of the premolar root canals were also recorded. Analysis of variance, Kruskal-Wallis, and the independent samples t-tests were used for the comparisons (p = 0.05).

Results: The thickest walls for both premolars were buccal and lingual walls at all three root levels (p < 0.05). The thinnest walls for the first premolar teeth were mesial and distal walls of the lingual canal, while it was the mesial end of the buccal and lingual canals for the second premolars (p < 0.05). Dentin wall thicknesses at the mesial end of buccal and lingual canals of C1-shaped first premolars were thinner than C2-shaped first premolars at the apical level (p < 0.05).

Conclusions: Danger zones for C-shaped mandibular first and second premolars are predominantly mesial walls facing the radicular groove and distal wall of the lingual canal. CBCT imaging during endodontic treatment is recommended to avoid complications.

When root canal infections breach the maxillary sinus floor (MSF), maxillary sinusitis of endodontic origin (MSEO) can result. This case illustrates the surgical management of MSEO following the nonsurgical reestablishment of the MSF. A 55-year-old woman presented with left facial pain and was diagnosed with MSEO originating from the left upper first molar. Despite undergoing nonsurgical root canal treatment, there was no evidence of bony healing after 6 months. However, cone-beam computed tomographic (CBCT) scans revealed the reestablishment of MSF. Subsequently, surgical intervention was carried out using a dental operating microscope. Two years after surgery, CBCT images indicated that the mucosal edema had resolved, and the MSF was well reestablished. Preserving the MSF is crucial for the success of endodontic surgery. When MSEO is present, the integrity of the MSF must be assessed to determine appropriate treatment options.