Journal of Clinical and Experimental Dentistry最新文献

{"title":"Histologic Analysis of Peri-implant Soft Tissue Around External Hexagon and Morse Taper Implant Connections.","authors":"Daniel Sartorelli Marques de Castro, Jefferson David Melo de Matos, Jozely Francisca Mello Lima, Guilherme da Rocha Scalzer Lopes, Mário Alexandre Coelho Sinhoreti, Daher Antonio Queiroz, Carlos do Reis Pereira de Araújo","doi":"10.4317/jced.63947","DOIUrl":"10.4317/jced.63947","url":null,"abstract":"<p><strong>Background: </strong>Twenty patients rehabilitated with screw-retained full-arch implant-supported prostheses functioning for at least one year were included.</p><p><strong>Material and methods: </strong>This clinical study included 20 patients rehabilitated with screw-retained full-arch implant-supported prostheses in function for at least 1 year. Participants were allocated into two groups according to the implant-abutment connection design: external hexagon (EH; n = 10) and Morse taper (MT; n = 10). One peri-implant soft tissue biopsy specimen was obtained from each patient and processed for hematoxylin-eosin staining. Histological evaluation assessed epithelial hyperplasia, epithelial organization, inflammatory infiltrate intensity, and connective tissue fibrosis. Data normality was assessed using the Shapiro-Wilk test. Intergroup comparisons were performed using the Mann-Whitney U test, with a significance level of = 0.05.</p><p><strong>Results: </strong>Mean epithelial hyperplasia scores were 2.0 in the EH group and 1.6 in the MT group (P = 0.690). Mean fibrosis scores were 2.2 (EH) and 2.4 (MT) (P = 0.841). Inflammatory infiltrate scores were 0.4 in the EH group and 2.0 in the MT group (P = 0.095). No statistically significant differences were observed between groups for any evaluated parameter. The combined histologic score also showed no significant intergroup difference (P = 0.222).</p><p><strong>Conclusions: </strong>Within the limitations of this clinical study, peri-implant soft tissue architecture and inflammatory profiles were similar between external hexagon and Morse taper implant-abutment connections in full-arch rehabilitations following at least one year of functional loading.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e518-e523"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170951/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cardiovascular Effects of 4% Articaine with 1:100,000 versus 1:200,000 Epinephrine during Inferior Alveolar Nerve Block: A Prospective Randomized Double-Blind Clinical Study.","authors":"Marcele Cruz da Silva, Bruno Teixeira Gonçalves Rodrigues, Estephani Martins Barcellos de Carvalho, Thaís Pimentel de Sá Bahia, Fábio Gamboa Ritto, Paulo José d'Albuquerque Medeiros","doi":"10.4317/jced.63739","DOIUrl":"10.4317/jced.63739","url":null,"abstract":"<p><strong>Background: </strong>Local anesthetic solutions containing epinephrine are widely used in oral surgery to prolong anesthesia and improve hemostasis; however, their sympathomimetic effects may influence cardiovascular parameters. Evidence comparing different epinephrine concentrations in articaine during third-molar surgery remains limited. This randomized clinical trial compared the cardiovascular effects and clinical performance of 4% articaine with epinephrine 1:100,000 (A100) and 1:200,000 (A200) during mandibular third-molar extraction.</p><p><strong>Material and methods: </strong>A prospective, randomized, split-mouth, double-blind clinical trial was conducted in 40 healthy patients undergoing bilateral impacted mandibular third-molar extraction. Each participant received A100 on one side and A200 on the contralateral side in randomized order with a 15-day interval. Heart rate (HR), blood pressure (BP), and oxygen saturation (SpO2) were recorded at baseline, immediately after injection, and at 5 and 15 minutes. Intraoperative bleeding, pain (VAS), and need for supplemental anesthesia were also assessed. Paired statistical tests were applied ( = 0.05).</p><p><strong>Results: </strong>Eighty procedures were analyzed. Intraoperative bleeding incidence was similar between A100 (10%) and A200 (12.5%) (p = 1.000). Supplemental anesthesia was required in 3.8% of procedures, with no difference between concentrations (p = 1.000). HR increased with both formulations but was significantly higher with A100 at 5 and 15 minutes (p = 0.035 and p = 0.003). BP showed no significant differences at any time point. SpO2 remained within normal limits, with slightly higher values for A200 at intermediate times. Pain scores did not differ significantly.</p><p><strong>Conclusions: </strong>Both epinephrine concentrations in 4% articaine provided comparable anesthetic efficacy and hemostasis with minimal cardiovascular effects in healthy patients undergoing mandibular third-molar extraction. The 1:200,000 concentration produced a smaller heart-rate increase, suggesting a potential advantage in patients with cardiovascular risk, while 1:100,000 remains suitable when greater vasoconstriction is desired.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e457-e463"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170941/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wide-thread implant macrogeometry and immediate implant placement: A systematic review of primary stability, marginal bone loss, and survival outcomes.","authors":"Rubén Jiménez Hernández","doi":"10.4317/jced.63890","DOIUrl":"10.4317/jced.63890","url":null,"abstract":"<p><strong>Background: </strong>Wide-thread dental implants have been proposed to enhance primary stability and marginal bone preservation in immediate implant placement protocols, particularly in low-density bone. This systematic review aimed to evaluate the influence of wide-thread implant macrogeometry on primary stability, marginal bone loss, and survival outcomes in immediate implant placement.</p><p><strong>Material and methods: </strong>A systematic electronic search was performed in PubMed (MEDLINE), complemented by manual screening of reference lists and forward and backward citation tracking, to identify studies published between January 2007 and August 2025. Clinical studies, in vitro experiments, finite element analyses, and reviews assessing the effect of implant macrogeometry, especially wide-thread configurations, on insertion torque, implant stability quotient (ISQ), marginal bone loss (MBL), and survival in immediate placement were included. Studies without biomechanical relevance, non-English publications, case reports, and those lacking quantitative stability or bone data were excluded.</p><p><strong>Results: </strong>A total of 36 records were initially identified, and 25 studies met the inclusion criteria. Increased thread depth, wider or more aggressive threads, and tapered implant bodies generally improved insertion torque and ISQ values, particularly in D3-D4 bone and post-extraction sockets. Clinical investigations reported high survival rates for immediately placed implants with optimized macrogeometry, while MBL typically remained within clinically acceptable limits when adequate primary stability and appropriate loading protocols were achieved. However, small sample sizes, short follow-up periods, heterogeneity among implant systems, and non-standardized outcome reporting limited the possibility of robust quantitative comparisons.</p><p><strong>Conclusions: </strong>Wide-thread implant macrogeometry appears to enhance primary stability in immediate placement and supports favorable short- to medium-term survival and marginal bone behavior when combined with careful case selection and controlled loading. Further well-designed prospective randomized studies with long-term follow-up are needed to determine whether these biomechanical advantages translate into superior long-term clinical outcomes.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e569-e581"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170939/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear bond strength and adhesive remnant index of metal brackets bonded after different post-bleaching waiting periods in enamel bleached with two bleaching agents: An in vitro study.","authors":"Angelo Miranda-Castro, Danny Ramírez-Tito, Leonor Castro-Ramirez, Luis Cervantes-Ganoza, Goretty Garcia-Luna, Marysela Ladera-Castañeda, César Cayo-Rojas","doi":"10.4317/jced.63892","DOIUrl":"10.4317/jced.63892","url":null,"abstract":"<p><strong>Background: </strong>Successful fixed orthodontic therapy using metal brackets depends on reliable bracket-to-enamel bonding. However, many patients undergo tooth bleaching before fixed orthodontics, which may alter enamel and compromise shear bond strength (SBS). The present in vitro study aimed to compare the SBS and the adhesive remnant index (ARI) of metal brackets bonded after different post-bleaching waiting periods to enamel bleached with two different agents.</p><p><strong>Material and methods: </strong>An in vitro experimental study was performed using eighty-four human premolars extracted for orthodontic reasons and randomly allocated to seven groups: an unbleached control group and six experimental groups bleached with 22% carbamide peroxide or 35% hydrogen peroxide and evaluated after three post-bleaching intervals (24 hours, 7 days, and 14 days). Brackets were bonded using Orthocem. SBS was tested in a universal testing machine, and failure mode was assessed using the adhesive remnant index (ARI) under stereomicroscopy. SBS was analyzed using robust one-way ANOVA with Games-Howell post hoc comparisons (p &lt; 0.05), and ARI distributions were compared using Fisher's exact test (p &lt; 0.05).</p><p><strong>Results: </strong>SBS varied according to bleaching agent and post-bleaching interval (p &lt; 0.001). With 35% hydrogen peroxide, SBS peaked at 7 days (12.63 ± 4.26 MPa) and decreased at 14 days (4.84 ± 2.08 MPa) (p &lt; 0.05). With 22% carbamide peroxide, SBS also peaked at 7 days (9.73 ± 3.76 MPa) and decreased at 14 days (3.23 ± 1.46 MPa) (p &lt; 0.05). Between agents, SBS was similar at 24 hours and 7 days (p = 0.936 and p = 0.091) but higher with hydrogen peroxide at 14 days (p = 0.039). ARI distributions did not differ across intervals for either bleaching agent (p &gt; 0.05).</p><p><strong>Conclusions: </strong>The SBS of metal brackets depended on the type of bleaching agent and the time elapsed, suggesting that bleached enamel may behave variably during the immediate post-treatment period. In addition, after 14 days, a significant deterioration in adhesion was observed, especially with 22% carbamide peroxide, which could translate into a higher risk of detachment if cementation is performed at that time. On the other hand, the distribution of the IRA did not show significant changes over time, indicating that bleaching would mainly affect the magnitude of bond strength rather than the failure pattern. These findings support orthodontic planning that considers the bleaching agent used and the waiting time before cementation, although clinical studies are needed to confirm its applicability in patients.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e524-e533"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170942/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polypharmacy, salivary function, and oral health outcomes in institutionalized older adults: A scoping review.","authors":"Fernando Mauricio Espada-Salgado, María Mihaela Iuga, Bogdan Oprea, Alex Rodrigo A Capellino-Gambetta","doi":"10.4317/jced.63940","DOIUrl":"10.4317/jced.63940","url":null,"abstract":"<p><strong>Background: </strong>Polypharmacy is common in long-term care facilities (LTCFs) and may contribute to xerostomia, hyposalivation, and oral disease. However, evidence specific to LTCF populations has not been comprehensively mapped. Objective: To map the available evidence on the association between polypharmacy or medication burden and salivary dysfunction and oral health outcomes in institutionalized older adults.</p><p><strong>Material and methods: </strong>This scoping review was conducted in accordance with Joanna Briggs Institute guidance and reported following PRISMA-ScR. PubMed/MEDLINE, Embase, Scopus, Web of Science Core Collection, and LILACS via BVS were searched from 1 January 2005 to 23 January 2026. To identify potentially relevant grey literature, Google Scholar and ClinicalTrials.gov were also searched. Screening was performed in Rayyan, data were extracted using a piloted charting form, and findings were synthesized narratively.</p><p><strong>Results: </strong>Eight studies published between 2010 and 2025 were included. Seven used a cross-sectional design and one was a randomized controlled trial, all conducted in LTCF settings in Europe and Asia. Polypharmacy, commonly defined as the use of five or more medications, was highly prevalent. Measures of xerogenic or anticholinergic burden identified associations with xerostomia or reduced salivary flow more consistently than medication count alone. Dry mouth was frequent, and where oral outcomes were assessed, substantial oral morbidity was also reported.</p><p><strong>Conclusions: </strong>In institutional care settings, salivary dysfunction and oral disease are common and appear to be more closely associated with xerogenic or anticholinergic burden than with medication number alone. Preventive oral care protocols integrated with xerogenic risk-informed medication review and standardized outcome assessment should be prioritized in future LTCF research and care.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e549-e560"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170949/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Treatment Decision-Making for Teeth with Post-Treatment Apical Periodontitis Among Dental Students, General Dentists, and Endodontists in Chile.","authors":"Nicolás Dufey-Portilla, Ignacia Vera, Fernando Peña-Bengoa, Giovanna Bórquez, Carolina Cáceres, Venkateshbabu Nagendrababu, Paul M H Dummer, Francesc Abella, Marc Garcia-Font","doi":"10.4317/jced.63471","DOIUrl":"10.4317/jced.63471","url":null,"abstract":"<p><strong>Background: </strong>This study aimed to evaluate treatment decision-making processes when assessing periapical radiographs of teeth with post-treatment apical periodontitis (AP) among dental students (DS), general dental practitioners (GDP), and endodontists (E) within Chile, and to identify demographic and tooth-related factors associated with extraction decisions.</p><p><strong>Material and methods: </strong>A cross-sectional study was conducted between 2023 and 2024, involving 431 participants who assessed standardised periapical radiographs depicting clinical scenarios and selected one treatment option: root canal retreatment, apical surgery/intentional replantation, or extraction. A nested mixed logistic regression model and simple logistic regression analyses were performed to evaluate associations between treatment choices and clinician- or tooth-related variables (p &lt; .05).</p><p><strong>Results: </strong>Demographic factors significantly associated with extraction decisions included professional group, age, and workplace. GDP and DS were significantly more likely to recommend extraction (p &lt; 0.001 for both), particularly among GDPs aged 36-45 years (p = 0.003) and those working in the public sector. All tooth-related variables significantly influenced decisions. Teeth with indirect restorations were associated with higher extraction rates, especially among GDP (p &lt; 0.001). Inadequate root canal fillings significantly increased extraction decisions by GDPs (p &lt; 0.001). GDPs also had a strong tendency to extract teeth with medium (p &lt; 0.001) and large apical lesions (p = 0.001).</p><p><strong>Conclusions: </strong>Significant differences were observed across professional groups, with E demonstrating a greater tendency toward tooth preservation. Improving clinical decision-making in undergraduate and continuing dental education may help reduce unnecessary extractions and support evidence-based health planning in underserved areas with limited access to specialist care.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e483-e493"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170950/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the Tunnelling Technique for Upper Labial Frenectomy Using ER:YAG Laser.","authors":"Luis Monteiro, Inês Álvaro, Sara Ferreira, Leonor Delgado, Teresa Vale, José Júlio Pacheco, Filomena Salazar","doi":"10.4317/jced.63544","DOIUrl":"10.4317/jced.63544","url":null,"abstract":"<p><strong>Background: </strong>An abnormal upper labial frenum (ULF) can represent a potentially harmful gingival insertion located between the central incisors. Lasers, particularly the Er:YAG laser, have been described for ULF frenectomy and offer several promising advantages. The aim of this study was to evaluate the usefulness of Er:YAG laser frenectomy using the \"tunnelization technique\" for the elimination of an abnormal upper labial frenum.</p><p><strong>Material and methods: </strong>This cohort study evaluated ULF frenectomy using the tunnelling technique with an Er:YAG laser in a cohort of 20 patients treated between January 2011 and December 2024. The ULFs were morphologically and clinically characterized before and after the procedure.</p><p><strong>Results: </strong>No intraoperative complications were observed during the frenectomy, apart from moderate intraoperative bleeding in 12 patients (60%), with no sutures required in any case. Postoperatively, analgesic medication was required by only 2 patients (10%) for mild pain. At the 3-month follow-up, a significant reduction was observed in both frenulum size (P&lt;0.001) and interincisal diastema (P=0.008). All incisive papillae were preserved without any defects.</p><p><strong>Conclusions: </strong>Er:YAG laser frenectomy using the tunneling technique proved to be a suitable option, resulting in the immediate preservation of the incisive papilla and a reduction in ULF size and position, without significant associated complications.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e433-e440"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170948/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of the Bond Strength of Silane-Treated Glass Fiber Posts at Different Solvent Evaporation Times: An In Vitro Study.","authors":"Valeria Ramos-Ramos, Sergio Dextre-Herrera, Giovanna Ramírez-Vargas, Leonor Castro-Ramirez, Denisse Turpo-Claudio, Luis Cervantes-Ganoza, César Cayo-Rojas","doi":"10.4317/jced.63939","DOIUrl":"10.4317/jced.63939","url":null,"abstract":"<p><strong>Background: </strong>Silane is used as a coupling agent on glass fiber posts to enhance chemical interaction at the post-resin cement interface. This in vitro study evaluated the bond strength of silane-treated glass fiber posts at different solvent evaporation times.</p><p><strong>Material and methods: </strong>This in vitro experimental study included forty single-rooted mandibular premolars assigned to four groups according to silane solvent evaporation time: G1 (control), G2 (60 s), G3 (120 s), and G4 (180 s). Specimens were stored in physiological saline at 37 °C. After endodontic treatment, root canals were prepared and glass fiber posts were cemented. In the experimental groups, silane was applied and allowed to evaporate for the allotted time. After cementation, the roots were sectioned into thirds (coronal, middle, and apical) and bond strength was determined using the push-out test on a universal testing machine. Welch's ANOVA with Games-Howell post hoc was used to compare groups. Statistical significance was set at p &lt; 0.05.</p><p><strong>Results: </strong>In the middle third, significant differences were observed between evaporation times (p &lt; 0.001), with higher values for 180 s (13.94 ± 6.59 MPa) versus 60 s (3.86 ± 2.04 MPa; p = 0.004), 120 s (3.30 ± 1.85 MPa; p = 0.003) and control (4.69 ± 2.95 MPa; p = 0.007). In the coronal third (control: 7.09 ± 3.00 MPa; 60 s: 7.22 ± 3.16 MPa; 120 s: 4.81 ± 2.05 MPa; 180 s: 8.01 ± 4.34 MPa) and in the apical third (control: 6.49 ± 3.09 MPa; 60 s: 5.56 ± 1.96 MPa; 120 s: 5.19 ± 3.98 MPa; 180 s: 8.10 ± 3.40 MPa) no significant differences were detected between protocols (p = 0.164 and p = 0.196, respectively). When comparing root thirds within each protocol, only the 60 s group showed differences, with higher bond strength in the coronal third than in the middle third (p = 0.032).</p><p><strong>Conclusions: </strong>Evaporation of the silane solvent for 180 s improved the bond strength of the glass fiber posts in the middle root third, while no significant differences were detected in the coronal and apical thirds between the times evaluated. Within protocols, the 60 s group showed lower bond strength in the middle third than in the coronal third. Taken together, these findings suggest that prolonging evaporation to 180 s may be a useful operative adjustment to optimize bonding in the middle third, with no evidence of consistent benefit in the coronal and apical regions.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e494-e503"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170938/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of metallurgical and geometric characteristics on cyclic fatigue resistance of three thermally treated NiTi rotary instruments.","authors":"Raimundo Sales de Oliveira Neto, Guilherme Ferreira da Silva, Diego Rafael Nespeque Correa, Rodrigo Ricci Vivan, Murilo Priori Alcalde, Marco Antonio Hungaro Duarte","doi":"10.4317/jced.63479","DOIUrl":"10.4317/jced.63479","url":null,"abstract":"<p><strong>Background: </strong>This study aimed to evaluate the cyclic fatigue resistance and metallurgical characteristics of thermally treated NiTi rotary instruments: ProDesign Logic, Solla Purple, and Solla Colors.</p><p><strong>Material and methods: </strong>Cyclic fatigue testing was conducted at room temperature (20°C ± 1°C) and simulated body temperature (36°C ± 1°C) using a standardized artificial canal with a 60° curvature and 5 mm radius. Ten instruments per group (25.06) were tested at each temperature. Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM) were employed to assess phase transformation behavior and fracture topography, respectively.</p><p><strong>Results: </strong>ProDesign Logic exhibited the highest cyclic fatigue resistance at room temperature compared to Solla systems (p&lt;0.0001). Temperature variations did not significantly affect cyclic fatigue resistance (p&gt;0.05). ProDesign Logic had the highest austenite finish temperature (Af = 53.0°C). SEM confirmed typical fatigue fracture patterns in all groups.</p><p><strong>Conclusions: </strong>ProDesign Logic demonstrated greater cyclic fatigue resistance, attributed to its high Af temperature and cross-sectional design.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e510-e517"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170945/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Absence of the Periodontal Space in Impacted Third Molars: A Cross-Sectional Study Using Cone Beam Computed Tomography.","authors":"Cinthia Christhie Sancho Davila-Moreno, Mary Isolina Mendez-Nava, Jhoana Mercedes Llaguno-Rubio, Gustavo Adolf Fiori-Chincaro, Luis Ernesto Arriola-Guillén","doi":"10.4317/jced.63920","DOIUrl":"10.4317/jced.63920","url":null,"abstract":"<p><strong>Background: </strong>This study aimed to determine the frequency of tomographic signs indicating the absence of the periodontal space (APS) in impacted third molars using cone-beam computed tomography (CBCT) and to assess its association with demographic and anatomical variables, as well as the presence of replacement resorption (RR).</p><p><strong>Material and methods: </strong>A cross-sectional and retrospective observational study was conducted using 258 randomly selected tomographic volumes from a radiological center in Lima, Peru, in 2025. The study evaluated 457 impacted upper and lower third molars. Two trained and calibrated evaluators analyzed the impaction of the third molars using multiplanar CBCT reconstructions with a voxel size of 0.2 mm. The variables assessed included age, sex, dental arch, third molar position, affected root zone, angulation of the third molar (APS), and root resorption (RR). Chi-square tests and logistic regression analyses were performed, with p &lt; 0.05 considered statistically significant.</p><p><strong>Results: </strong>221 cases (48.35%) exhibited an absence of periodontal ligament spaces. The absence of the periodontal space was significantly associated with third molar position, being more frequent in horizontal (27.1%) and distoangular (23.1%) positions (p = 0.003). The apical third was the most commonly affected root zone (43.0%) (p &lt; 0.001). Replacement resorption (RR) was observed exclusively in molars without a detectable periodontal space (3.6%) (p = 0.003). Age was identified as the only significant predictor; with each additional year, the risk of APS increased by a factor of 1.07 (p &lt; 0.001).</p><p><strong>Conclusions: </strong>The absence of the periodontal ligament space in third molars is highly prevalent, especially in older patients, particularly those with horizontal or distoangular positions and when the apical region is involved.</p>","PeriodicalId":15376,"journal":{"name":"Journal of Clinical and Experimental Dentistry","volume":"18 4","pages":"e476-e482"},"PeriodicalIF":0.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13170936/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147941794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}