Dental Materials最新文献

{"title":"Fractal analysis in different regions of a fracture surface in a dental glass-ceramic","authors":"Kartikeya S. Jodha ,&nbsp;Susana M. Salazar Marocho ,&nbsp;John J. Mecholsky Jr. ,&nbsp;Seth T. Lirette ,&nbsp;Yuanyuan Duan ,&nbsp;Jason A. Griggs","doi":"10.1016/j.dental.2025.06.008","DOIUrl":"10.1016/j.dental.2025.06.008","url":null,"abstract":"<div><h3>Objectives</h3><div>Previous studies have reported the fractal dimension of dental ceramic fracture surfaces from mist and hackle regions. The aim of this study was to determine and compare the fractal dimensional increment between the mirror, mist, and hackle regions of lithium disilicate fracture surfaces.</div></div><div><h3>Methods</h3><div>Nine bar-shaped specimens were prepared from lithium disilicate glass-ceramic. One face of each specimen was indented using a Knoop diamond at 10 N followed by loading in 4-point flexure until failure at a loading rate of 12.6 MPa/s to avoid environmental slow crack growth. Fracture surfaces were replicated in epoxy, and an atomic force microscope (AFM) was used to scan the replicas. Noise in scans was reduced by Laplace transform filter. The FRACTALS software was used to determine the fractal dimensional increment (D*) by the Minkowski cover algorithm.</div></div><div><h3>Results</h3><div>Median D values (25 %, 75 % quartiles) from mirror, mist, and hackle regions were 2.14 (2.12, 2.14), 2.14 (2.12, 2.15), and 2.14 (2.12, 2.15), respectively. A multilevel mixed model with clustering on repeated measures showed that the fractal dimension between the mirror-mist (p = 0.51), mist-hackle (p = 0.90), and mirror-hackle (p = 0.43) regions are not significantly different.</div></div><div><h3>Significance</h3><div>Fractal dimension in mirror, mist, and hackle regions of the fracture surface were not significantly different in lithia disilicate glass-ceramics. Any portion of the primary fracture surface can be analyzed using fractal analysis to investigate the conditions present at the time of failure.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 1008-1013"},"PeriodicalIF":4.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144293046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gold vs. CAD/CAM ceramic partial-crowns: 20-year randomized clinical study","authors":"Fabian Cieplik ,&nbsp;Julia L. Pfister ,&nbsp;Karl-Anton Hiller ,&nbsp;Isabelle M. Schenke ,&nbsp;Gottfried Schmalz ,&nbsp;Wolfgang Buchalla ,&nbsp;Marianne Federlin ,&nbsp;Konstantin J. Scholz","doi":"10.1016/j.dental.2025.06.004","DOIUrl":"10.1016/j.dental.2025.06.004","url":null,"abstract":"<div><h3>Objectives</h3><div>Despite their widespread use, no systematic clinical long-term data are yet available comparing CAD/CAM partial ceramic crowns (PCCs) with cast gold partial crowns (CGPC). The null-hypothesis of this 20-year follow-up of a controlled prospective randomized split-mouth study was that CGPCs and PCCs reveal similar cumulative survival and clinical performance after 20 years of service.</div></div><div><h3>Methods</h3><div>In this clinical study, 29 patients initially received one CGPC (Degulor-C) and one PCC (Vita-Mark-II/Cerec3). The 20-year follow-up examination was performed by two independent investigators using both, modified USPHS and FDI criteria. Kaplan-Meier survival rates were calculated including failures from patient-files. Non-parametrical statistics (χ², log-rank(Mantel-Cox), α= 0.05) were applied.</div></div><div><h3>Results</h3><div>Out of initially 29 patients, 19 patients and 36 restorations were considered for survival analysis revealing a cumulative survival of 69 % (CGPC) and 53 % (PCC), without statistically significant differences based on patient files. Regarding FDI and USPHS criteria, 11 patients (19 restorations) were available for clinical examination after a median (25–75 %) observation period of 238 (236−242) months (19.9 years). Within these 11 patients, 10 CGPC and 9 PCCs were still in service. All restorations showed ratings within the acceptable range exclusively (USPHS: Alpha for secondary caries, Alpha and Bravo for other criteria; FDI: scores 1–3). For USPHS criteria surface luster (<em>p</em> ≤ 0.002) and marginal discoloration (<em>p</em> ≤ 0.02), both CGPCs and PCCs, revealed significant deterioration over time. Additionally, marginal adaptation of PCCs deteriorated over time (<em>p</em> &lt; 0.001) and was found significantly worse than that of CGPCs at 20-years (<em>p</em> = 0.003). In FDI criteria, CGPCs performed significantly better regarding surface staining (A2a; <em>p</em> = 0.047) and marginal adaptation (B6; <em>p</em> = 0.01) compared to PCCs.</div></div><div><h3>Conclusions</h3><div>All PCCs and CGPCs available for evaluation showed acceptable results after 20 years, with slight advantages for CGPCs in singular criteria. The present study is the first randomized controlled prospective study revealing that PCCs exhibit similar long-term cumulative survival as CGPCs with only slightly inferior performance and thus can be confidently recommended for long-term clinical application.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 986-993"},"PeriodicalIF":4.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144293047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"G-CSF/laponite/collagen composite inducing stem cells of apical papilla homing for dental pulp regeneration","authors":"Yi Zhao ,&nbsp;Jiawei He ,&nbsp;Cheng Liang,&nbsp;Mengru Hong,&nbsp;Li Liao,&nbsp;Xiaoxia Su","doi":"10.1016/j.dental.2025.06.001","DOIUrl":"10.1016/j.dental.2025.06.001","url":null,"abstract":"<div><h3>Objective</h3><div>Irreversible pulpitis in immature teeth is a serious dental disease which may lead to unclosed apical foramen and even tooth loss. Our study proposed a system of G-CSF/laponite/collagen composite and investigated its effects for stem cells of apical papilla (SCAPs) homing, targeting a potential treatment for immature dental pulp regeneration.</div></div><div><h3>Methods</h3><div>In vitro, the effect of G-CSF on SCAPs proliferation, migration and differentiation was investigated. The microporous scaffold structure, sustained-release capability and cytotoxic effects of G-CSF/laponite/collagen composite was evaluated. In vivo, dentin cannulas model filled with G-CSF/laponite/collagen composite implanted in the back of nude mice was utilized to verify the effects of SCAPs homing for pulp regeneration.</div></div><div><h3>Results</h3><div>In our study, the promoting effects of G-CSF on SCAPs proliferation and migration were verified, and the optimal concentration was chosen at 10 and 50 ng/ml. Interestingly, G-CSF had a slight effect on osteogenesis but significantly increased the gene expression of odontogenesis (<em>DSPP, DMP-1</em>). Laponite was observed to adsorb and slowly release G-CSF in a sustained manner, and the “laponite + collagen” contained micropore scaffold structure without biotoxicity for SCAPs. In vivo, 50 ng/ml G-CSF/laponite/collagen composite appeared to be the best combination for pulp regeneration, among the aspects of neo-tissue area, regenerative cells, odontoblast-like ratio, and number of blood vessels.</div></div><div><h3>Conclusion</h3><div>Our study proposed that 50 ng/ml G-CSF/laponite/collagen composite has a great potential to induce SCAPs homing for immature dental pulp regeneration, providing a new strategy to treat irreversible pulpitis in immature teeth.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 974-985"},"PeriodicalIF":4.6,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144281856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Is high-power laser irradiation a time efficient method to debond zirconia restorations?","authors":"Jaccare Jauregui-Ulloa,&nbsp;Aditya Kunapareddy,&nbsp;Amol Janorkar,&nbsp;Jason Griggs,&nbsp;Michael Roach,&nbsp;Susana Salazar Marocho","doi":"10.1016/j.dental.2025.05.011","DOIUrl":"10.1016/j.dental.2025.05.011","url":null,"abstract":"<div><h3>Objective</h3><div>We aimed to assess the time efficiency of an Er,Cr:YSGG laser at 7.5 W for removing adhesively bonded zirconia structures, evaluating (1) temperature safety (&lt;44 °C), (2) cytotoxicity, (3) phase transformation, and (4) debonding. Methods: Zirconia-resin cement-resin composite specimens were subjected to laser irradiation and monitored using an infrared camera. Cytotoxicity was evaluated by laser irradiating murine cells, with cell viability and proliferation assessed at 24 h and 7 days post-irradiation. Changes in zirconia surface roughness and morphology were analyzed and the localized tetragonal to monoclinic phase transformation (t → m) in the laser-irradiated zirconia was investigated using SEM/EBSD. The shear bond strength of laser irradiated 2 and 3 mm thick resin-bonded zirconia slices was tested. Additionally, a pull-off test was conducted on resin-bonded zirconia crowns to evaluate the laser’s efficiency in removing clinically relevant specimens. Results: Mean temperatures across the specimens’ layers were between 27.2 and 28.8 °C. Cell proliferation significantly increased following laser irradiation at both time points; however, a marked decrease in cell viability was observed after 7 days. While irradiation did not alter surface roughness, microcracks formed on the zirconia surface and triggered t → m phase transformation in these regions. Shear bond strength was significantly reduced in both the 2 and 3 mm irradiated zirconia groups, with most samples showing spontaneous debonding during irradiation. No significant difference in pull-off force was found between the non-irradiated and irradiated zirconia crowns. Significance: Laser irradiation at 7.5 W for 120 s is not a time efficient method to remove zirconia crowns.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 947-954"},"PeriodicalIF":4.6,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analysis of pulpal temperature changes in bulk fill resin composites with different photoinitiators activated using various light curing units: An in vitro study","authors":"Fahad Baabdullah ,&nbsp;Fahad Bakitian ,&nbsp;Hatem Alshammari ,&nbsp;Mohammad Aljanakh ,&nbsp;Abdullah Holdar ,&nbsp;Ilknur Ozcan ,&nbsp;Sibel A. Antonson","doi":"10.1016/j.dental.2025.06.007","DOIUrl":"10.1016/j.dental.2025.06.007","url":null,"abstract":"<div><h3>Objective</h3><div>This study compared heat generation and transfer through the dentin to the pulpal wall while curing two bulk-fill resin composites (BFRCs) with different light curing units (LCUs).</div></div><div><h3>Methods</h3><div>A human molar tooth model was used to measure heat generation and transfer through the dentin to the pulpal wall while curing BFRCs with various LCUs. One hundred BFRC samples were divided into ten groups based on BFRC/LCU combinations (n = 10). Five LCUs with different spectral emissions (Bluephase G2, Bluephase PowerCure, D-Light Pro, Valo Cordless, Demi Ultra) were used for curing two BFRCs with different photoinitiator systems (Tetric EvoCeram Bulk Fill and Filtek One Bulk Fill). Measurements included temperature change (ΔT), time to maximum temperature (t), heat duration above threshold (Δt), and heat transfer rate (Q). One-way ANOVA (p &lt; 0.001) and Tukey’s post hoc test were used for analysis.</div></div><div><h3>Results</h3><div>Significant differences in ΔT, Δt, and Q values were found based on BFRC/LCU combinations (p &lt; 0.001). Valo Cordless generated the lowest heat, while Bluephase G2 generated the highest heat. Bluephase G2 exhibited the longest duration above the threshold, while Valo Cordless had the shortest duration (p &lt; 0.001). Valo Cordless and Demi Ultra produced lower heat transfer rates in the Filtek and Tetric groups, respectively. No significant differences were found in t values among BFRC/LCU combinations (p = 0.590).</div></div><div><h3>Significance</h3><div>Heat generation and transfer from LCUs to dental pulp through dentin and BFRCs vary regardless of spectral emission. Different BFRCs with various photoinitiators produce differing heat levels, potentially increasing the risk of pulp injury. Selecting the appropriate combinations of LCUs and BFRCs can significantly reduce pulp damage risk.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 965-973"},"PeriodicalIF":4.6,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Near-infrared-activatable angiogenic proteinaceous nanomicelles for sequential augmentation of bone repair in periodontal defects","authors":"Mou Seung Kim ,&nbsp;Dong Chang Kim ,&nbsp;Yun Kee Jo","doi":"10.1016/j.dental.2025.06.003","DOIUrl":"10.1016/j.dental.2025.06.003","url":null,"abstract":"<div><div>The highly vascularized architecture of natural bone has inspired sequential augmentation of vascularization and osteogenesis to promote bone tissue regeneration, particularly in periodontal defects characterized by severely diminished bone quantity and quality, often worsened by systemic conditions such as osteoporosis. However, current growth factor delivery systems frequently lack precise control over release profiles and allow limited modification of predetermined kinetics. Herein, near-infrared (NIR) light-activatable angiogenic proteinaceous nanomicelles (NMs) bioengineered from vascular elastin-like polypeptide (VELP) have been proposed to enable rapid angiogenesis and on-demand release of osteoinductive growth factors in a biocompatible, minimally invasive manner. This on-demand release is triggered using a specific NIR stimulation (808 nm, 1.5 W/cm² for 10 min), resulting in approximately 80 % BMP-2 release within 5 h, which can be precisely timed to the optimal healing phase. The potential of bone morphogenetic protein-2 (BMP-2)-loaded VELP NMs to release BMP-2 upon NIR irradiation was validated, demonstrating enhanced osteogenic differentiation and maturation within a three-dimensional microporous scaffold. The findings establish VELP NMs as effective smart nanocarriers for growth factor delivery to support vascularized tissue regeneration. This NIR-activatable delivery system offers a promising strategy for the remotely controlled release of therapeutic cargo in tissue injuries.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 955-964"},"PeriodicalIF":4.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144264983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dental Materials celebrates 40th anniversary!","authors":"Jack L. Ferracane","doi":"10.1016/j.dental.2025.06.009","DOIUrl":"10.1016/j.dental.2025.06.009","url":null,"abstract":"","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 901-902"},"PeriodicalIF":4.6,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144245466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the physicochemical and adhesive properties of an etch-and-rinse adhesive system incorporated with magnesium whitlockite nanoparticles","authors":"Francisbênia Alves Silvestre ,&nbsp;Davino Machado Andrade Neto ,&nbsp;Áldrison Canafístula Rêgo Araújo ,&nbsp;Marcos Antonio de Albuquerque Ferreira ,&nbsp;Diego Lomonaco Vasconcelos de Oliveira ,&nbsp;Sara Jessica Marciano ,&nbsp;Adriano Lincoln Albuquerque Mattos ,&nbsp;Madiana Magalhães Moreira ,&nbsp;Victor Pinheiro Feitosa ,&nbsp;Raniel Fernandes Peixoto","doi":"10.1016/j.dental.2025.06.002","DOIUrl":"10.1016/j.dental.2025.06.002","url":null,"abstract":"<div><h3>Objective</h3><div>To synthesize and characterize magnesium whitlockite nanoparticles (nMg-WH) to evaluate the physicochemical and adhesive properties of a conventional adhesive incorporating different concentrations of nMg-WH.</div></div><div><h3>Method</h3><div>nMg-WH were synthesized using a hydrothermal method and characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Six groups of adhesive systems were prepared with different concentrations of nMg-WH (wt%: 0 % [Control], 0.1 %, 0.2 %, 0.5 %, 1 %, and 2 %) to evaluate the degree of conversion (DC, %), viscosity (cP), water sorption (WS, µg/mm³), and solubility (SL, µg/mm³). Forty-eight molars (n = 8) were sectioned and randomized between groups and evaluated for contact angle (in degrees) and microshear bond strength (µSBS), before and after thermocycling (TC) involving 10,000 cycles with a 30-s immersion time at temperatures of 5 °C and 55 °C. Statistical analysis was performed using one-way ANOVA (DC, cP, WS and SL) or mixed ANOVA (µSBS), followed by Tukey’s test for multiple comparisons (α = 0.05).</div></div><div><h3>Results</h3><div>Regarding the physicochemical properties, the 0.2 % (51.3 ± 0.3), 0.5 % (49.0 ± 1.4), and 1 % (49.2 ± 1.9) nMg-WH groups showed significantly higher DC compared to the control (41.0 ± 0.2). The 0.2 % group presented the lowest contact angle (16.24 ± 7.79), indicating enhanced wettability. Viscosity increased proportionally with concentration, although 0.1 % (28.91 ± 0.75) remained comparable (p &gt; 0.05) to the control (31.00 ± 1.08). WS and SL were not significantly affected at higher concentrations (0.5 %, 1 %, and 2 %). Before TC, the 0.1 % (32.1 ± 4.0) and 0.2 % (30.9 ± 2.1) nMg-WH groups demonstrated statistically higher (p &lt; 0.05) µSBS values than the control (18.0 ± 5.2). After TC, concentrations of 0.2–2 % exhibited higher μSBS compared to the control, with the 0.5 % nMg-WH group showing the highest value (31.8 ± 1.0).</div></div><div><h3>Significance</h3><div>nMg-WH improved the physicochemical properties of the adhesive system and increased adhesion to dentin, particularly at concentrations ranging from 0.2 % to 1 %.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 938-946"},"PeriodicalIF":4.6,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144245467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Titanium-Zirconia abutment-implant assemblies: Are they alternatives for single material implants?","authors":"Saeed Al-Asaadi ,&nbsp;Nicole Austin ,&nbsp;Peter J. Watson ,&nbsp;David J. Wood ,&nbsp;Asmaa Altaie ,&nbsp;Flavia P. Rodrigues","doi":"10.1016/j.dental.2025.05.007","DOIUrl":"10.1016/j.dental.2025.05.007","url":null,"abstract":"<div><h3>Objectives</h3><div>To compare the biomechanical performance of titanium, zirconia, and titanium-zirconia hybrid abutment-implant assemblies using finite element analysis (FEA).</div></div><div><h3>Methods</h3><div>Four three-dimensional finite element models of implant-abutment-crown assemblies were developed using Solid Works 2022 SP3.1 and Abaqus 2022 (<em>Dassault Systèmes</em>), based on the abutment-implant systems: (1) Titanium abutment and implant - Ti-Ti, (2) Zirconia abutment and implant - ZrO₂-ZrO₂, (3) hybrid - titanium abutment with zirconia implant - Ti-ZrO₂, and (4) hybrid - zirconia abutment with titanium implant - ZrO₂-Ti. A cemented-retained zirconia crown and a 5-mm diameter abutment, with no inclination, were used in all models. The fit between the abutment and the implant was performed by a 9-mm length and 1-mm diameter titanium abutment screw. Volumetric finite elements with a linear tetrahedral shape (C3D4) and “tie” interactions represented 100 % of osteointegration. A distributed load of 200 N was applied to the crown, while the bone was fully constrained. For linear analysis, all materials were assumed to be linear, elastic, isotropic, and homogeneous. The FEA focused on evaluating the stress distribution within the implant, abutment, and surrounding tissues.</div></div><div><h3>Results</h3><div>The hybrid zirconia-titanium assembly exhibited lower peak stress at the gingiva compared to the titanium-zirconia model and the full titanium or zirconia implant models. The hybrid titanium-zirconia and the full titanium assembly demonstrated the lowest peak stress in the bone, whereas the zirconia-titanium model and the full zirconia implant models exhibited higher stresses. The full titanium and the titanium-zirconia assemblies exhibited the highest stress concentration at the implant-abutment interface, highlighting potential areas for mechanical failure.</div></div><div><h3>Significance</h3><div>Finite element analysis indicates that the hybrid zirconia-titanium abutment-implant assembly offers a viable alternative to single-material implants. The hybrid configurations combine the advantages of both materials, promoting balanced stress distribution and favourable biomechanical performance. The findings suggests that titanium-zirconia hybrid implants may enhance implant longevity and success rates, making them a promising option for clinical applications.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 8","pages":"Pages 914-925"},"PeriodicalIF":4.6,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144245468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A machine learning model exploring creep performance of dental composites","authors":"J. Yang ,&nbsp;Z. Hao ,&nbsp;D.C. Watts ,&nbsp;J. Wang ,&nbsp;X. Jiang","doi":"10.1016/j.dental.2025.05.009","DOIUrl":"10.1016/j.dental.2025.05.009","url":null,"abstract":"<div><h3>Objectives</h3><div>Viscoelastic creep behaviour of RBCs determines their dimensional stability and thus contributes to their clinical performance. However, due to complex material compositional variations and differing testing protocols, comparing and analyzing the most effective factor affecting RBC viscoelastic creep behaviour is challenging. Hence, the present study aimed to establish a robust machine learning (ML) model based on datasets for creep behaviour of commercial RBCs to analyze and predict creep behaviour of RBCs and identify critical compositional factors contributing to their performance.</div></div><div><h3>Materials and methods</h3><div>Compressive creep deformation and recovery were measured for 5 RBCs under dry or wet conditions using a standard creep apparatus - 2 h of 20 MPa compression and 2 h creep recovery after load removal. Each RBC’s compositional data was encoded as 17 binary indices [0 and 1], which, along with experimental data, served as inputs for ML model training. 40 ML models were considered and initially ranked based on model indicators.</div></div><div><h3>Results</h3><div>Results showed that creep was composition-dependent and was significantly increased with water storage (p &lt; 0.05). Of the top 8 ML models, the ExtraTrees model demonstrated exceptional predictive accuracy that successfully forecasted maximum strain (%), permanent set (%) and creep recovery (%) for an additional RBC (<em>VisCalor</em>) (R²=0.9999). Feature importance analysis identified ORMOCER and SiO₂ as the most influential monomer and filler components, respectively, affecting creep recovery.</div></div><div><h3>Significance</h3><div>The developed ML model offers a powerful tool for predicting RBC creep performance and uncovering key compositional factors. With future dataset expansion, this model has the potential to guide the design of advanced dental composites with improved clinical durability.</div></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":"41 7","pages":"Pages 872-879"},"PeriodicalIF":4.6,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144214507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}