Journal of Clinical and Experimental Dentistry最新文献

Background: The objective of this study was to assess the push-out bond strength (PBS) of conventional prefabricated, universal 2-piece, and CAD/CAM-milled fiber posts cemented in root canals using a self-adhesive resin cement, as well as the Vickers microhardness (VHN) of the resin cement.

Material and methods: Thirty human uniradicular premolars roots were endodontically treated and divided into three groups (n = 10): conventional prefabricated fiber posts (PFPs), universal fiber posts (UFPs), and CAD/CAM-milled fiber posts (MFPs). After luting procedures using RelyX U200 (Solventum), six specimens were obtained of each root (two slices from each root third: cervical, middle, and apical). The first slices of each root region were subjected to PBS, and the second slices were subjected to VHN analysis. Data from the PBS and VHN tests were analyzed using two-way analysis of variance (ANOVA; post type vs. root region) and Tukey's test (α = 0.05).

Results: Regarding the PBS, MFPs and UFPs demonstrated statistically superior performance than PFPs (p < 0.001). Among the root regions, the cervical third exhibited the highest values, whereas the apical third showed the lowest (p < 0.001). Regarding VHN, PFPs and UFPs exhibited statistically superior values compared with MFPs (p < 0.001). The cervical third of the root displayed the highest VHN values, whereas the apical third presented the lowest (p < 0.001).

Conclusions: CAD/CAM-milled and universal 2-piece fiber posts may be a better alternative for restoring widened root canals. Key words:Resin Cements, CAD-CAM, Post and Core Technique, Hardness Tests, Root Canal Preparation.

Background: Large Language Models (LLMs) are transforming clinical decision-making by offering rapid, context-aware access to evidence-based knowledge. However, their efficacy in pediatric dentistry remains underexplored, especially across multiple LLM platforms.Objective: To comparatively evaluate the clinical quality, readability, and originality of responses generated by nine contemporary LLMs for pediatric dental queries.

Material and methods: A cross-sectional study assessed the performance of ChatGPT-3.5, ChatGPT-4o, Gemini 2.0, Gemini 2.5, Claude 3.5 Haiku, Claude 3.7 Sonnet, Grok-3, Grok-3 Mini, and DeepSeek-V3. Twenty pediatric dental questions were posed in one-shot queries to each LLM. Responses were evaluated by ten pediatric dental experts using the Modified Global Quality Scale (MGQS), Flesch Reading Ease Score (FRES), Flesch-Kincaid Grade Level (FKGL), and Turnitin Similarity Index. ANOVA and Cohen's Kappa were used for statistical analysis.

Results: ChatGPT-4o demonstrated the highest overall MGQS (4.28 ± 0.24), followed by ChatGPT-3.5 (3.45 ± 0.27). DeepSeek-V3 scored lowest (2.18 ± 0.19). Topic-wise, ChatGPT-4o consistently outperformed others across all subdomains. FRES and FKGL scores indicated moderate readability, with Claude models exhibiting the highest linguistic complexity. Turnitin analysis revealed low-to-moderate similarity across models. Inter-rater agreement was substantial (κ = 0.78).

Conclusions: Among evaluated LLMs, ChatGPT-4o exhibited superior performance in clinical relevance, coherence, and originality, suggesting its potential utility as an adjunct in pediatric dental decision-making. Nonetheless, variability across models underscores the need for critical appraisal and cautious integration into clinical workflows. Key words:Artificial Intelligence, Clinical decision support, Health Communication, Large language models, Natural Language Processing.

Background: The retention stage has been the most controversial phase of orthodontic treatment, as there are no specific guidelines regarding the type, mode and duration of retention. The detachment of a retainer creates urgency, necessitates additional consultation time and increases the risk of tooth movement. Therefore, ensuring the stability of a retainer and preventing detachment is crucial, particularly as saliva moisture poses a risk during bonding.

Material and methods: This pilot study employs an epidemiological, observational, descriptive and longitudinal design to compare the failure rates of lower lingual retainers cemented with the NOLA retractor against those cemented with the Spandex retractor. The sample comprised 32 participants, with 16 each in the NOLA group and the relative isolation group. The NOLA group included 10 men (62.5%), while the isolation group had only 3 men (18.7%). The normality of the data was assessed using the Shapiro-Wilk test, and the Student's t-test was applied to compare changes between the NOLA and relative isolation groups.

Results: The failure rate was higher in the relative isolation group (37.5%) compared with the NOLA group (25.0%), although this difference was not statistically significant (p = 0.446). A progressive and significant increase in the Little's Irregularity Index values was observed in both groups over time. While there was a greater increase in values in the NOLA group, the difference did not reach statistical significance (p = 0.108 at 3 months and p = 0.284 at 6 months).

Conclusions: Both isolation methods demonstrated similar success rates in retaining fixed retainers over the analysed time period. Key words:Orthodontic Retainers, Fixed Orthodontic Appliance, Removable Orthodontic Appliances, Periodontal Index.

Bullous pemphigoid (BP) is an autoimmune blistering disorder mainly affecting the elderly. Although primarily cutaneous, bullous pemphigoid can occasionally involve the oral mucosa, which complicates diagnosis and management. We report an 88-year-old woman with diabetes and dementia who presented with tense bullae on her limbs. Systemic corticosteroid therapy improved the skin lesions, but new painful erosions appeared on the hard palate. Although mucosal BP was considered, the concurrent improvement of cutaneous symptoms suggested an opportunistic infection instead. Culture confirmed Candida albicans, and antifungal therapy led to rapid resolution. This case highlights the diagnostic challenge of distinguishing between BP progression and steroid-induced candidiasis. Early detection and proper treatment are essential, especially in elderly, immunocompromised patients. Maintaining oral hygiene through dental collaboration also plays a crucial role in preventing such complications. Our findings underscore the importance of multidisciplinary care and managing infection when treating BP in patients with systemic vulnerabilities. Key words:Bullous pemphigoid, Oral candidiasis, Elderly patient with diabetes.

Background: Nanohybrid resin composites are widely used in esthetic dentistry, and the choice of an appropriate polishing technique can influence their surface properties. The aim of this study was to compare, in vitro, the surface roughness of three nanohybrid resin composites before and after dry and wet polishing.

Material and methods: This in vitro longitudinal experimental study included 60 composite resin discs, evenly distributed into three groups (n = 20): Filtek Z250XT, Opallis, and Tetric N-Ceram. Each group was further divided into two equal subgroups (n = 10) for the application of dry and wet polishing techniques. Surface roughness was measured using a digital profilometer before and after polishing. Independent and paired Student's t-tests were used for statistical analysis, with a significance level set at p < 0.05.

Results: Prior to polishing, no significant differences in average surface roughness (Ra) were found among the resin groups, indicating adequate standardization: Filtek Z250XT (p = 0.899), Opallis (p = 0.585), and Tetric N-Ceram (p = 0.721). Following dry or wet polishing, no significant intragroup differences were observed: Filtek Z250XT (p = 0.066), Opallis (p = 0.124), and Tetric N-Ceram (p = 0.584). When comparing pre- and post-treatment values, Filtek Z250XT showed a significant reduction only with wet polishing (p = 0.003). In contrast, both Opallis and Tetric N-Ceram exhibited a significant decrease in roughness with both polishing methods: dry (p = 0.044 and p = 0.001, respectively) and wet (p < 0.001 for both).

Conclusions: Both dry and wet polishing were effective in reducing the surface roughness of Opallis and Tetric N-Ceram resin composites, whereas in Filtek Z250XT, a significant reduction was observed only with wet polishing. These findings suggest that the effectiveness of the polishing procedure may vary depending on the type of resin composite, which should be considered when selecting clinical finishing and polishing protocols to optimize the surface properties of restorative materials. Key words:Comparative study, Composite Resins, Dental materials, Dental polishing, Surface properties, surface roughness.

Background: Enhancing the adaptation and durability of composite restorations remains a major challenge in modern adhesive dentistry. Recently, a new self-cured resin composite has gained attention with the potential to improve interfacial adaptation and reduce polymerization shrinkage stress, offering an alternative to conventional light-cured systems.

Material and methods: Sixteen freshly extracted human molars were prepared with standardized Class II cavities and randomly assigned to two groups (n=8). The first group was restored using a self-cure bulk-fill resin composite (Stela Automix, SDI Ltd., Australia) with its respective primer, while the second group received an injecTable resin composite (G-aenial Universal InjecTable, GC Corporation, Japan) with a universal adhesive. Restorative procedures followed manufacturers' instructions. The restorations were finished and polished, before being stored in distilled water at 37°C for six months to simulate aging conditions. After storage, specimens were sectioned longitudinally and analyzed using environmental scanning electron microscopy to evaluate internal adaptation, and interfacial gap measurements were recorded.

Results: An independent Sample T-test showed a statistically significant difference in interfacial gap (IG%) between the two restorative systems, with the self-cure composite showing more favourable outcomes. For stela, the IG% was13.5±6.1 while for InjecTable composite IG%=28.4±13.3.

Conclusions: The Stela primer and composite used in this study demonstrated superior internal adaptation compared to the light-cured control, suggesting they could be a viable alternative, particularly for deep gingival margins or situations where light curing is inaccessible. Key words:Self-cure composite, internal adaptation, SEM, curing mode, Universal adhesive.

The term keratoameloblastoma has been used to describe a histologically heterogeneous group of ameloblastoma variants that share the formation of keratin by the ameloblastomatous epithelium. To date, thirty-eight cases of keratoameloblastoma have been previously reported in the literature, nine of which exhibited a papilliferous component. Here we report a new case of a recurrent tumor that falls within the keratoameloblastoma spectrum. It presented as an expansile, solid lesion with internal calcification in the right infratemporal fossa six years after ipsilateral hemimandibulectomy in a 46-year-old white female. Histological evaluation revealed islands of columnar cells resembling ameloblasts surrounding a central area with stellate reticulum-like cells, some of them completely filled with keratin. In addition, areas showed basal ranging from columnar to cuboidal with hyperchromatic nuclei. The clinical, histopathologic, and radiographic features of keratoameloblastoma are reviewed, along with treatment approaches and follow-up considerations. Although only a few cases have been documented, the tumor's aggressive biological behavior and the high recurrence rate suggest that a more aggressive therapeutic approach is warranted. Patients should be informed of the importance of clinical monitoring. Surgical resection with adequate safety margins and histopathological evaluation of the margins is strongly recommended. Key words:Odontogenic tumors, keratoameloblastoma, ameloblastoma, review.

Background: The increasing demand for minimally invasive aesthetic procedures, particularly botulinum toxin type A (BTX-A) injections, has expanded the scope of dental practice to include facial aesthetics. However, the safe and effective administration of BTX-A requires a thorough understanding of facial anatomy, including the topographic relationships of muscles, skin layers, and vascular structures. This cross-sectional study aimed to identify the primary anatomical concerns and knowledge gaps among dentists performing BTX-A injections.

Material and methods: A structured questionnaire was distributed to 316 dentists, assessing their confidence and knowledge regarding facial anatomy and BTX-A application.

Results: A total of 62% of participants had specialized training, while 37% had attended BTX-A-specific courses. Notably, professionals with specialized training demonstrated significantly greater confidence and anatomical knowledge compared to their non-specialized counterparts. Key areas of concern included the corrugator supercilii, levator labii superioris alaeque nasi, orbicularis oculi, frontalis, and platysma muscles, as well as the facial artery's location and depth. Over 80% of respondents reported limited or insufficient knowledge in these areas, highlighting a critical need for enhanced anatomical education and practical training.

Conclusions: The study underscores the importance of integrating facial anatomy and injection techniques into dental curricula and continuing education programs to ensure patient safety and optimize treatment outcomes. By addressing these knowledge gaps, dentists can confidently expand their practice to include BTX-A applications, contributing to the growing field of orofacial harmonization. Key words:Botulinum toxin type A, Facial anatomy, Dental practice, Cosmetic Dentistry; Esthetic Dentistry.

Background: Diagnosing and clinically managing vertical root fractures (VRF) present ongoing challenges for dentists. This study aimed to assess the diagnostic approaches and the clinical management employed by Brazilian dentists when confronted with suspected cases of VRF.

Material and methods: Online questionnaires were sent to dentists via social media and email. The questionnaire consisted of seven inquiries about the diagnosis and clinical management of suspected VRF cases. The data were evaluated descriptively and statistically using the Chi-square, Fisher's exact and Kruskal-Wallis tests (p<0.05).

Results: A total of 517 dentists answered the questionnaire, 72.3% were Endodontists, 17.41% were general practitioners, and 10.25% were specialists in other dental fields. A narrow and deep periodontal pocket was the most frequently reported clinical sign (71.8%), while a halo-shaped radiolucency was the most common radiographic finding reported (59.3%). 85.7% of the participants reported requesting a cone-beam computed tomography (CBCT) scan to VRF suspected cases, and the combination of four complementary exams was most frequently selected by dentists (23.59%). Professional qualification influenced the number of clinical signals and of auxiliary exams reported in VRF suspected cases (p<0.05). 91.9% of the participants reported using both the image and the CBCT report to evaluate the scan, and no association was observed between dentist qualifications and CBCT evaluation methods (p<0.05). 308 participants indicated extraction for teeth suspected of VRF, whereas 90 suggested surgical exposure, with 79 of them being Endodontists. A significant association was observed between dentist qualifications and clinical management in suspected VRF cases (p<0.05).

Conclusions: A variety of clinical and radiographic signals and symptoms were reported in suspected VRF cases. CBCT was the most commonly requested auxiliary exam. Professional qualification influenced the number of reported signals and symptoms, the number of auxiliary exams, and the clinical management strategies in suspected VRF cases. Key words:Cone Beam Computed Tomography, Endodontics, Questionnaire-based Study, Radicular Fracture, Vertical Root Fracture.

Background: Impacted third molars are common and often require surgical removal, which can lead to postoperative complications, particularly pain. While pain has been extensively studied in specialist settings, data from general dental practice remains limited. This study evaluated postoperative pain over seven days following mandibular third molar surgery performed by general dental practitioners (GDPs), who conduct a significant number of these procedures.

Material and methods: A prospective multi-center cohort study was conducted in three public dental clinics in Luleå, Sweden, from October 2022 to December 2023. Participants (≥18 years old) undergoing mandibular third molar surgery were included, while those requiring referral to an oral maxillofacial surgeon were excluded. Pain intensity was self-reported daily using a numerical rating scale (NRS) from 0-10. Statistical analyses included descriptive statistics, chi-square tests, and t-tests.

Results: Of 133 enrolled participants, 111 submitted valid pain assessments. Pain peaked on the day of surgery (Day 0), with 4% reporting the worst imaginable pain (NRS 10), 34% severe pain (NRS 7-9), and 35% moderate pain (NRS 4-6). Pain significantly declined by Day 1 (p<0.001) and continued to decrease throughout the week. Female participants reported higher pain scores (statistically significant on Days 2-4) and used more analgesics. Sedated patients also reported higher pain scores. Bilateral surgeries showed slightly higher pain levels, though not statistically significant. Postoperative complications were rare (one case of paraesthesia, two infections).

Conclusions: Postoperative pain after third molar surgery performed by GDPs was highest on the day of surgery and declined rapidly. Key words:Postoperative pain, third molar, oral surgery.