Journal of Dental Research, Dental Clinics, Dental Prospects最新文献

{"title":"Fracture Load in Monolithic Multilayer Zirconia Crowns From Three Manufacturers: an in Vitro Study.","authors":"Neil Duvan Gutierrez Echavarria, Juan Jose Perico Gomez, Camilo Andres Galvez Reyes, Alejandra Marleth Ordoñez Molina, Julian Andres Tamayo Cardona","doi":"10.34172/joddd.44548","DOIUrl":"10.34172/joddd.44548","url":null,"abstract":"<p><strong>Introduction: </strong>Multilayer zirconia crowns have gained popularity in oral rehabilitation due to their combination of gradient aesthetics and mechanical strength. However, gaps exist in the literature regarding differences in fracture load among commercial brands, a critical variable for their selection in patients with parafunctional habits. Previous studies have evaluated monolithic zirconia, but few have examined multilayer zirconia under standardized conditions. The present in vitro study compared the fracture load of monolithic crowns fabricated from multilayer zirconia discs of three commercial brands: BeautyZir, Upcera, and Yucera.</p><p><strong>Methods: </strong>A comparative experimental study was conducted using 30 monolithic crowns made from multilayer zirconia discs, distributed as follows: 10 crowns from ST + Multilayer® BeautyZir, 10 from 4D Pro® Yucera, and 10 from Explore® Upcera. Abutments were fabricated with a chamfer finish preparation on an ivorine tooth (#16) and scanned with the TRIOS 3 intraoral system (3Shape®). The resulting STL file was laser-sintered in cobalt‒chromium to obtain the abutment for crown placement. Crown design was performed in Exocad® software with a central fossa depth of 2.1 mm. The crowns were milled according to each brand's specifications and subjected to fracture load testing on a universal Instron® machine, applying axial force using a 12-mm-diameter metallic sphere at a crosshead speed of 3 mm/s. Data were collected using Excel and analyzed using one-way ANOVA and post hoc Tukey tests (α=0.05), following verification of normality with the Kolmogorov-Smirnov and Shapiro-Wilk tests.</p><p><strong>Results: </strong>Mean fracture loads (±SD) were: ST + Multilayer®: 1807 N (±463), Explore®: 1682 N (±368), Yucera®: 1173 N (±183). ANOVA revealed significant differences between groups (<i>P</i>=0.001). The Tukey test showed significant differences between Yucera and Upcera (<i>P</i>=0.010) and Yucera and BeautyZir (<i>P</i>=0.001), with Upcera and BeautyZir demonstrating significantly higher fracture loads than Yucera; however, no differences were observed between Upcera and BeautyZir (<i>P</i>=0.719). All the tested brands exceeded physiological masticatory forces (133-727 N), but Yucera had the lowest safety margin. The high standard deviation in BeautyZir (±463 N) suggests variability in manufacturing quality.</p><p><strong>Conclusion: </strong>The three multilayer zirconia brands tested withstood normal occlusal forces, but Upcera and BeautyZir were better suited for patients at risk of higher loads. The lack of difference between Upcera and BeautyZir supports their interchangeable clinical use. The lower resistance of Yucera and high dispersion in BeautyZir emphasize the need for stringent quality control during manufacturing. Future studies should incorporate thermocycling, cementation, and in vivo follow-up to validate these findings under clinical conditions.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"104-111"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616813/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074919","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":"Fracture Resistance and Failure Modes of Ultrathin Occlusal Veneers Made of Different Ceramic Materials: An In Vitro Study.","authors":"Mohamed Ezzat Elbanna, Hesham Ibrahim Othman, Ahmed Mohammed Leithy Alameldin","doi":"10.34172/joddd.44718","DOIUrl":"10.34172/joddd.44718","url":null,"abstract":"<p><strong>Introduction: </strong>The current in vitro study was designed to assess the failure mode and fracture resistance of ultrathin occlusal veneers made from different ceramic materials.</p><p><strong>Methods: </strong>Twenty-four ultrathin occlusal veneers were fabricated on maxillary extracted first premolar teeth. Three ceramic materials were used: lithium disilicate (LDS), zirconia-reinforced lithium disilicate (ZLS), and zirconium dioxide (ZIR). An adhesive luting agent was used to adhesively bond occlusal veneers. Each sample was subjected to thermocycling, ranging from 5 to 55°C. Fracture resistance was tested using a universal testing machine, and fractured surfaces were examined with a stereomicroscope and a scanning electron microscope (SEM) to assess failure modes.</p><p><strong>Results: </strong>A statistically significant difference was observed; the highest mean fracture resistance was observed in LDS (1741±308.3 N), followed by ZLS (1192±89.44 N), and then ZIR (866.9±60.23 N), which had the lowest mean fracture resistance. The failure mode of the ZIR group differed significantly from those of the other groups.</p><p><strong>Conclusion: </strong>All the tested ceramic materials used as ultrathin occlusal veneers exhibited fracture loads significantly higher than the average physiological masticatory forces. Compared with the other two groups, LDS had the highest fracture resistance value. ZIR occlusal veneers exhibited more repairable fractures than LDS and ZLS.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"80-87"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616834/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074925","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":"Accuracy of Guided Implant Surgery Using Tomographic Guides Combined with Functional Impression: An In Vitro Study.","authors":"Renata Bommarito, Yolanda de Toledo Salvado da Ressurreição, Luciana Akemi Yamaguchi, Flavia Iotti Fernandes, Eduardo Perissinotto, Marcos Venturini Ferreira, Marcio Katsuyoshi Mukai, Roger Nishyama, Marcelo Munhóes Romano","doi":"10.34172/joddd.44401","DOIUrl":"10.34172/joddd.44401","url":null,"abstract":"<p><strong>Introduction: </strong>Deviations between virtually planned and placed implants are still reported in guided implant surgery in completely edentulous arches. Associating a functional impression with the tomographic guide may enhance guide retention and reduce deviations. This study evaluated the effect of using a functional impression during tomographic image acquisition on the accuracy of implant placement in the edentulous maxilla.</p><p><strong>Methods: </strong>Fourteen 3D-printed edentulous maxillary models were fabricated. A complete denture was designed and printed for use as a tomographic guide for each model. During dual-scan image acquisition, the experimental group's tomographic guides were seated with a light-body silicone functional impression, whereas the control group was scanned without impression material (n=7). After image registration in Blue Sky Plan software, implants were virtually planned, and surgical guides were printed for the placement of six implants per model. Postoperative scans were obtained, and STL files of planned and placed implants were superimposed to measure linear and angular deviations. Statistical analysis was performed using two-way ANOVA for functional impression and implant region (α=0.05).</p><p><strong>Results: </strong>No statistically significant differences were found regarding the effects of functional impression or implant position (<i>P</i>>0.05) on apical linear (2.11-3.25 mm), coronal linear (1.41-2.06 mm), or angular deviations (5.82-7.27°).</p><p><strong>Conclusion: </strong>The accuracy of implant positioning in edentulous maxillae was not significantly affected by the incorporation of a functional impression during tomographic scanning or by the implant region, although deviations were still observed. Further studies are necessary to evaluate the potential benefits of this approach in specific clinical scenarios.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"88-93"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616825/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074927","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":"Ex Vivo Analysis of the Antimicrobial Effect of Diode Laser and Sodium Hypochlorite on <i>Enterococcus Faecalis</i> Atcc 29212.","authors":"Germania Patricia Torres Veintimilla, Mauricio Aguirre Balseca, Karina Maria Salvatore Freitas, Boris Hernán Villacrés Granda","doi":"10.34172/joddd.43918","DOIUrl":"10.34172/joddd.43918","url":null,"abstract":"<p><strong>Introduction: </strong>The present study evaluated the efficacy of the diode laser in eliminating <i>Enterococcus faecalis</i> ATCC 29212 from root canals through ex vivo experiments.</p><p><strong>Methods: </strong>Ninety single-rooted premolars were prepared with Endogal files, incubated anaerobically at 37ºC for 14 days, and randomly assigned to six groups (n=15 per group): G1: irrigation with 5.25% sodium hypochlorite (NaOCl); G2: NaOCl plus diode laser L1 (660 nm, 100 mW, 90 s); G3: NaOCl plus diode laser L2 (808 nm, 100 mW, 90 s); G4: L1 alone; G5: L2 alone; and G6: 0.9% sodium chloride (NaCl) as control. Root canal samples were collected using sterile paper points, and bacterial load was assessed by mass plating on Mueller‒Hinton agar, followed by incubation at 37ºC for 24 hours to quantify colony-forming units (CFU/mL).</p><p><strong>Results: </strong>The combination of NaOCl and photodynamic therapy (PDT) (G2) significantly reduced bacterial counts compared with NaOCl alone (G1) (Z=2.89, adjusted <i>P</i>=0.01), and NaOCl combined with the 808 nm laser (G3) was significantly more effective than PDT alone (G4) (adjusted <i>P</i><0.001). When applied without NaOCl, both laser-based protocols were significantly less effective than NaOCl alone: NaOCl (G1) produced significantly greater bacterial reduction than PDT alone (G4) (Z=-2.50, adjusted <i>P</i>=0.04), followed by the 808 nm laser alone (G5) (Z=-4.40, adjusted <i>P</i><0.001).</p><p><strong>Conclusion: </strong>The combination of 5.25% NaOCl with PDT produced the lowest <i>E. faecalis</i> counts and was significantly more effective than NaOCl alone, followed by the laser protocols applied without NaOCl. However, it did not differ significantly from NaOCl combined with the 808 nm laser, indicating that its advantage over other NaOCl-based protocols was numerical rather than statistically confirmed.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"112-119"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616816/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074880","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 Fracture Resistance and Fracture Patterns of Root-Filled Maxillary Premolars Restored with Different Post Systems and Composite-Based Post Space Restorations: An in Vitro Study.","authors":"Sulhi Abidin, Hanna Nadhirah Mohd Radzi, Muhamad Sharifuddin Mat Daud, Norfaezah Ahmad, Izzuddin Ahmad Nadzirin, Galvin Sim Siang Lin","doi":"10.34172/joddd.44391","DOIUrl":"10.34172/joddd.44391","url":null,"abstract":"<p><strong>Introduction: </strong>Root-filled teeth are structurally and biomechanically weakened, and the choice of post-endodontic restoration is important. This study compared the fracture resistance and fracture patterns of root-filled maxillary premolars restored with different post systems and composite-based post space restorations.</p><p><strong>Methods: </strong>One hundred extracted maxillary second premolars were endodontically treated and randomly allocated to five groups (n=20): metal post (group A), fiber post (group B), flowable composite resin in the post space (group C), fiber-reinforced composite resin in the post space (group D), and composite resin restoration without post with a glass ionomer orifice barrier (control, group E). All the specimens received a standardized mesio-occluso-distal (MOD) cavity preparation with preservation of the buccal wall and were restored with nanohybrid composite before axial loading in a universal testing machine to determine fracture resistance. Meanwhile, fracture patterns were classified under a stereomicroscope.</p><p><strong>Results: </strong>Mean (±standard deviation) fracture resistance values were metal post (896.26±335.55 N), fiber post (1046.64±336.65 N), flowable composite resin (937.94±323.83 N), fiber-reinforced composite resin (799.90±244.43 N), and control (973.54±357.33 N), with no statistically significant differences between the groups (<i>P</i>=0.175). Metal and fiber post groups predominantly exhibited favorable, restorable Class 2 fractures, whereas flowable composite resin, fiber-reinforced composite resin, and control groups mainly demonstrated Class 3 or Class 4 fractures.</p><p><strong>Conclusion: </strong>Root-filled teeth restored with or without posts exhibited similar fracture resistance. Fiber and metal posts, however, produced more favorable fracture patterns, suggesting that posts can influence failure mode even without increasing overall fracture strength.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"126-132"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616815/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074921","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":"Preparation and Evaluation of the Remineralization Effect of a Dental Varnish Containing Casein Phosphopeptide-Amorphous Calcium Phosphate with Fluoride (Cpp-Acpf) on White Spot Lesions of Permanent Teeth: An In Vitro Study.","authors":"Sarah Uriat, Sina Gholami, Somayeh Khoramian Tusi, Faranak Salmannejad","doi":"10.34172/joddd.44108","DOIUrl":"10.34172/joddd.44108","url":null,"abstract":"<p><strong>Introduction: </strong>White spot lesions (WSLs) are early indicators of enamel demineralization and require effective r e m i n e r a l i z a t i o n strategies to prevent progression. This in vitro study aimed to prepare and evaluate a dental varnish containing casein phosphopeptide-amorphous calcium phosphate with fluoride (CPP-ACPF) and to compare its remineralization efficacy with a commercial MI GC varnish and a control varnish.</p><p><strong>Methods: </strong>The dental varnish formulation was prepared. To evaluate its physicochemical properties and compare them with the MI varnish, density and viscosity measurements were conducted. To evaluate the effect of the varnishes on remineralization, 36 enamel specimens were obtained from the buccal surface of extracted human non-carious premolars. The specimens were randomly divided into three groups (n=12). Microhardness measurements of the tooth surface were taken at three stages: (1) baseline (sound enamel) before demineralization, (2) immediately after demineralization, and (3) after the remineralization period. Scanning electron microscopy (SEM) was used to examine the enamel surface morphology at each stage.</p><p><strong>Results: </strong>Enamel surface microhardness (Vickers hardness number, VHN) significantly decreased after demineralization (baseline: 310±12; after demineralization: 185±10; <i>P</i><0.001). Following treatment, the prepared CPP-ACPF group exhibited the highest recovery (275±11 VHN), compared with MI varnish (245±13 VHN) and control (210±9 VHN). Repeated-measures mixed ANOVA confirmed significant differences between the groups (<i>P</i><0.001), with the Tukey test showing that prepared CPP-ACPF varnish>MI varnish>control. Scanning electron microscopy revealed smoother and more uniform remineralized surfaces in the prepared CPP-ACPF group.</p><p><strong>Conclusion: </strong>The results indicated that the prepared CPP-ACPF varnish provided superior remineralization and could serve as a stable, cost-effective option for managing early enamel lesions.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"94-103"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616814/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074936","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":"Effects of Three Different Niti Rotary Instruments on Dentin Cracks After Root Canal Preparation.","authors":"Rhona Mariana Untari, Wignyo Hadriyanto, Rachmat Sriwijaya, Margareta Rinastiti","doi":"10.34172/joddd.42346","DOIUrl":"10.34172/joddd.42346","url":null,"abstract":"<p><strong>Introduction: </strong>This study aimed to examine the effects of three distinct nickel-titanium (NiTi) rotary instruments on dentin crack formation during root canal preparation in various root segments.</p><p><strong>Methods: </strong>Thirty premolars with a single straight root canal were prepared using three rotary instruments, namely, ProTaper Next, ProTaper Gold, and HyFlex Controlled Memory (CM).</p><p><strong>Results: </strong>The ProTaper Next produced the most dentin cracks, whereas HyFlex CM produced the fewest. Most cracks occurred in the coronal third of the root compared with the middle third. Dentin crack formation is a significant problem in root canal treatment and can lead to treatment failure. Therefore, an appropriate rotary instrument and technique for root canal preparation must be selected to minimize the risk of dentin crack formation.</p><p><strong>Conclusion: </strong>The results can guide clinicians in selecting the most suitable rotary instrument for successful endodontic treatment. In addition, irrigating with 2.5% NaOCl and saline for 1 min after preparation could help reduce the incidence of dentin cracks. Further research can explore new methods to minimize the risk of dentin crack formation during root canal preparation and improve the success rate of endodontic treatment.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"120-125"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616827/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074872","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":"Color Stability of Multi-Layered Zirconia Versus Lithium Disilicate Glass Ceramic: An in Vitro Study.","authors":"Doaa Mohamed Farahat Aboul Azm, Roqaia Mohammad Alassar, Asmaa Ahmed Mosleh, Noureldeen Mohamed Mohamed, Abdullah Waheed Faseeh, Abdelrhman Mohamed Ashour, Farag Rashed Saied","doi":"10.34172/joddd.44008","DOIUrl":"10.34172/joddd.44008","url":null,"abstract":"<p><strong>Introduction: </strong>Patients who receive ceramic restorations use daily oral care products or plaque-control agents, which may cause discoloration of these restorations. The present study assessed the color stability of multi-layered zirconia and lithium disilicate pressable ceramic after 28 days of immersion in chlorhexidine, coffee, and soda.</p><p><strong>Methods: </strong>A disc measuring 2 mm in thickness and 10 mm in diameter was designed to fabricate 30 discs, divided into two groups based on the ceramic material: multi-layered (ML) zirconia and lithium disilicate (LD). Each group was further subdivided into three subgroups based on the staining solution: chlorhexidine, Cola, and coffee. The samples were immersed in staining liquids at room temperature for 28 days. Color was measured immediately at t₀ and every week (t₁, t₂, t₃, and t₄) using a spectrophotometer. Color changes were calculated. For pairwise comparisons, the Friedman test was first employed, followed by post hoc tests.</p><p><strong>Results: </strong>The greatest ∆E was observed in LD specimens immersed in chlorhexidine (5.65), followed by LD specimens immersed in coffee (5.44). The lowest ∆E was observed for ML zirconia specimens immersed in coffee (0.64). Significant differences were observed between ∆E values of all tested groups and subgroups (<i>P</i>≤0.05).</p><p><strong>Conclusion: </strong>ML zirconia exhibited significantly higher color stability than LD pressable ceramic after being subjected to simulated 28 months of beverage consumption and using chlorhexidine.</p><p><strong>Clinical significance: </strong>Multi-layered zirconia exhibited higher resistance to discoloration than lithium disilicate pressable ceramic. Dental professionals should inform patients about the effects of chlorhexidine, Cola, and coffee on lithium disilicate pressable restorations.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"73-79"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616828/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074870","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":"Effect of Different Surface Treatments of CAD/CAM Zirconia Core on the Final Color of Porcelain-Veneered Restorations.","authors":"Ali Barzegar, Mehrnaz Motiei, Tahereh Ghaffari, Peyman Irankhah","doi":"10.34172/joddd.44821","DOIUrl":"10.34172/joddd.44821","url":null,"abstract":"<p><strong>Introduction: </strong>Achieving accurate color matching is essential for the aesthetic success of zirconia-based restorations, especially in the anterior region. Surface treatments are commonly used to enhance the bond between zirconia and porcelain, but their impact on the final color perception remains unclear. This study evaluated the effects of three surface treatments (control, acid etching, and sandblasting) on the color characteristics of porcelain-veneered zirconia.</p><p><strong>Methods: </strong>Sixty zirconia samples were divided into three groups: no surface treatment (control), acid etching, and sandblasting. Color measurements were taken using the CIELab* color system, with a specific focus on the color difference (ΔE) and the individual components of lightness (L), the red-green axis (a), and the yellow-blue axis (b).</p><p><strong>Results: </strong>The results showed that sandblasting resulted in the highest ΔE value (1.84±0.27), significantly greater than those of the control (ΔE=0.77±0.43) and acid etching (ΔE=0.67±0.22) groups (<i>P</i><0.05). Additionally, the sandblasted group exhibited a significant decrease in lightness (L=76.12), while the control group had a higher L value (L=77.85). No significant difference was observed between the acid-etched and control groups for any color component (<i>P</i>>0.05).</p><p><strong>Conclusion: </strong>Sandblasting significantly altered the optical properties of zirconia, leading to noticeable changes in color, particularly in lightness. In contrast, acid etching had minimal impact on color changes. These findings have clinical implications for the aesthetic planning of zirconia-based restorations, particularly in the anterior region, as highly aesthetic areas, where precise color matching is crucial.</p>","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"133-139"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616833/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074923","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":"Cognitive Ergonomics: Addressing Decision Fatigue in Dentistry.","authors":"Katayoun Katebi","doi":"10.34172/joddd.44818","DOIUrl":"10.34172/joddd.44818","url":null,"abstract":"","PeriodicalId":15599,"journal":{"name":"Journal of Dental Research, Dental Clinics, Dental Prospects","volume":"20 2","pages":"70-72"},"PeriodicalIF":0.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13616826/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149074887","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}