Journal of prosthodontic research最新文献

{"title":"Effects of chemical surface treatment on shear bond strength between additively manufactured denture base and autopolymerizing resins in non-aged conditions.","authors":"Nozomi Tanaka, Kazuma Nakazawa, Masahiro Ryu, Takayuki Ueda","doi":"10.2186/jpr.JPR_D_25_00256","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_25_00256","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to clarify the effects of chemical surface treatment of denture base resin on the shear bond strength between denture base resin fabricated by additive manufacturing and autopolymerizing resin in non-aged conditions.</p><p><strong>Methods: </strong>Five surface-treatment conditions were applied to specimens fabricated from two additively manufactured resins (AM 1 and AM 2): no treatment (NT); application of a dichloromethane-containing resin primer for 5 s (M5s), 60 s (M60s), or 120 s (M120s); and application of an ethyl acetate-containing resin primer for 120 s (E120s). Three surface-treatment conditions (NT, M5s, and E120s) were applied to control specimens fabricated from autopolymerizing denture base resin. The autopolymerizing resin was bonded to each specimen after chemical surface treatment. The shear bond strength was measured, and the failure modes on the specimen surfaces were observed.</p><p><strong>Results: </strong>The highest median shear bond strength was 16.8 MPa for the AM 1 specimens in M60s, 16.7 MPa for the AM 2 specimens in M5s, and 17.2 MPa for the autopolymerizing resin specimens in M5s. Substrate failure was observed in AM 1 specimens following M60s treatment. Cohesive failure was observed in AM 2 specimens following M5s treatment.</p><p><strong>Conclusions: </strong>Under non-aged conditions, chemical surface treatment of additive manufacturing resins with a dichloromethane-containing resin primer improved the shear bond strength to the autopolymerizing resin. Furthermore, the most effective application time of the dichloromethane-containing primer varied depending on the type of additive manufacturing denture base resin.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149111259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bonding performance and hydrolytic durability of zirconia treated with a hydrophobic long-chain silane in combination with MDP-containing luting agents.","authors":"Haruto Hiraba, Hiroyasu Koizumi, Shoko Miura, Akikazu Shinya, Pekka K Vallittu, Lippo Lassila","doi":"10.2186/jpr.JPR_D_26_00077","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_26_00077","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the effects of hydrophobic long-chain silane 8-methacryloxyoctyl trimethoxy silane (8-MOTS) on the bonding performance and hydrolytic durability of alumina-abraded zirconia with various luting agents.</p><p><strong>Methods: </strong>Zirconia specimens were airborne-particle-abraded with alumina and treated with 1.0% 8-MOTS, 0.5% 8-MOTS, 1.0% 3-(trimethoxysilyl) propyl methacrylate (3-TMSPMA), KATANA Cleaner, or no primers. Three luting agents (G-Cem One, methacryloyloxydecyl dihydrogen phosphate (MDP) only; PANAVIA SA Cement Universal, MDP, and silane; DUO-LINK Universal, without MDP and silane) were used for bonding. An additional DUO-LINK Universal group was treated with Z-Prime Plus. Shear bond strength (SBS) was measured after 24 h of water storage and 16 h of boiling (n = 8 each). Contact angles and debonded surfaces were also evaluated.</p><p><strong>Results: </strong>After boiling, 1.0% 8-MOTS maintained a significantly higher SBS than 1.0% 3-TMSPMA and primer-free conditions in G-Cem One (P = 0.0005). The effect of the external 8-MOTS was limited in PANAVIA SA Cement Universal and DUO-LINK Universal. In DUO-LINK Universal, both Z-Prime Plus and KATANA Cleaner maintained higher residual SBS than the primer-free condition. The high-SBS group generally exhibited more residual luting agents on the zirconia, whereas the low-SBS group predominantly showed exposed zirconia surfaces.</p><p><strong>Conclusions: </strong>The benefit of 8-MOTS was most evident in G-Cem One, in which 1.0% 8-MOTS maintained a higher zirconia bond strength after hydrothermal aging than 3-TMSPMA or no primers. These findings indicate that the effect of 8-MOTS depends on luting agent composition and represents secondary stabilization within a compatible MDP-containing bonding framework.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149110939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intraoral scanning for immediate denture fabrication in a patient with an unstable fixed prosthesis and severe tooth mobility: A case report.","authors":"Yu Yamamoto, Masaru Kaku","doi":"10.2186/jpr.JPR_D_26_00041","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_26_00041","url":null,"abstract":"<p><strong>Patients: </strong>Conventional impression taking for immediate denture fabrication may pose substantial risks to patients with unstable fixed prostheses or severely mobile teeth. This case report describes the use of an intraoral scanner (IOS) to obtain digital impressions and interocclusal records in a 74-year-old woman with an unstable maxillary full-arch fixed prosthesis and non-salvageable abutment teeth, which carry a substantial risk of prosthesis dislodgement, unintended extraction, or loss of the pre-extraction interocclusal relationship. Digital impressions were obtained without removing the failing prosthesis, and interocclusal records were acquired at the existing intercuspal position to preserve the pre-extraction occlusal relationship. The teeth planned for extraction were digitally removed using computer-aided design software, and the working casts were fabricated by three-dimensional printing. An immediate complete maxillary denture is conventionally fabricated on a duplicated gypsum cast and delivered immediately after prosthesis removal and tooth extraction.</p><p><strong>Discussion: </strong>Throughout the treatment, the digital approach preserved the pre-extraction occlusal relationship, avoided an edentulous interval, and supported oral function and patient comfort. The clinical contribution of this report lies in demonstrating the practical value of intraoral scanning in high-risk situations involving unstable prostheses and severe tooth mobility.</p><p><strong>Conclusions: </strong>Within the limitations of a single case, digital impression and interocclusal recording with an IOS may be useful options for immediate denture fabrication in patients with unstable prostheses and severe tooth mobility, particularly when preserving the pre-extraction occlusal relationship and avoiding prosthesis dislodgement or unintended extraction are clinically important.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149111299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of restoration design and material on the mechanical behavior of implant-supported monolithic CAD-CAM single crowns: An in vitro study.","authors":"Shaza Bishti, Rodi Bingöl, Stefan Wolfart, Taskin Tuna","doi":"10.2186/jpr.JPR_D_25_00328","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_25_00328","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the effects of crown design and restorative material on screw loosening and load-bearing performance of monolithic single-implant restorations after cyclic loading.</p><p><strong>Methods: </strong>Sixty implant-supported molar crowns were assigned to a conventional crown design (CCD; n=30), with a centrally positioned implant, or an alternative crown design (ACD; n=30), with a distally positioned implant and a premolar crown with cantilever. Each design was divided by restorative material (n=10): monochromatic zirconia (Zr_3), multilayer zirconia (Zr_3/5), and lithium disilicate (LS₂). Crowns were fixed to titanium bases (35 Ncm) and underwent thermomechanical loading (98 N, 1,200,000 cycles). Occlusal load was applied centrally on CCD crowns and eccentrically on the cantilever in ACD groups. Reverse torque values before and after loading were recorded in Ncm, and reverse torque differences were calculated. Specimens were retightened (35 Ncm) and loaded to failure. Data were analyzed using two-way analysis of variance.</p><p><strong>Results: </strong>No failures occurred during chewing simulation. ACD showed significantly lower reverse torque difference than CCD (6.72 ± 1.62 vs. 8.13 ± 1.70 Ncm; P = 0.002). CCD fracture loads were 6693 ± 738 N (Zr_3), 6969 ± 659 N (Zr_3/5), and 2330 ± 330 N (LS₂). ACD-Zr_3/5 and ACD-Zr_3 showed abutment bending at 914.29 ± 212.92 N and 835.97 ± 70.91 N, respectively, while ACD-LS₂ showed abutment bending followed by crown fracture at 1255.60 ± 195.88 N.</p><p><strong>Conclusions: </strong>Within study limitations, ACD did not increase screw loosening compared with CCD after cyclic loading. All designs and materials tolerated loads exceeding typical physiological masticatory forces.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149111231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of disk thickness on sintering distortion of fixed dental prostheses fabricated from unshaded multi-composition layered zirconia disks.","authors":"Syuntaro Nomoto, Mizuho Hirano, Hideshi Sekine","doi":"10.2186/jpr.JPR_D_26_00205","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_26_00205","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the effect of disk thickness on sintering distortion in four-unit fixed dental prostheses (FDPs) fabricated from unshaded multi-composition layered (MCL) zirconia disks.</p><p><strong>Methods: </strong>Unshaded MCL disks with different thicknesses (14, 18, 22, and 26 mm) were used to fabricate simplified four-unit FDPs. For each thickness, FDPs were milled from three vertical regions within the disk. Areas I, II, and III corresponded to the enamel side, central region, and cervical side, respectively. Seven FDPs were prepared under each condition. The FDPs were scanned before and after final sintering under manufacturer-recommended conditions. Using computer-aided design software, this study analyzed buccolingual midline cross-sections to quantify pre- to post-sintering changes in the external angle α.</p><p><strong>Results: </strong>The disk thickness and milling area significantly affected the sintering distortion, with a significant interaction, indicating that the milling area effect differed according to the disk thickness. Area I showed increased angle α, whereas Area II showed decreased α across all disk thicknesses. Area III showed the greatest increase in α in the 26 mm group. The 14 mm disk, closest to the prosthesis height, showed a smaller area-dependent variation than the 18 and 22 mm disks.</p><p><strong>Conclusions: </strong>The disk thickness influenced the magnitude and direction of sintering distortion in the four-unit FDPs fabricated from unshaded MCL disks. This pattern may be associated with the differences in the range and relative proportions of compositional layers incorporated into the prosthesis. A disk thickness close to the prosthesis height was associated with a smaller area-dependent variation.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149111280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Model-free digital-correction workflow for multi-implant restorations: A clinical proof-of-concept study.","authors":"Aiste Kernen-Gintaute, Mykolas Akulauskas, Florian Kernen, Nicola Ursula Zitzmann, Benedikt Christopher Spies, Felix Burkhardt","doi":"10.2186/jpr.JPR_D_26_00083","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_26_00083","url":null,"abstract":"<p><strong>Purpose: </strong>This clinical proof-of-concept study evaluates the feasibility and accuracy of a digital workflow for fabricating and correcting implant-supported restorations of multiple dental implants in an edentulous maxilla using intraoral scanning and reverse-scan bodies.</p><p><strong>Methods: </strong>An intraoral scan (IOS) was performed using vertical scan bodies in one patient with four implants in the edentulous maxilla. Ten verification bars (VB) were fabricated and clinically assessed. Nonpassive VBs were sectioned and reconnected intraorally (splinted verification bars, SVBs) and then scanned using reverse-scan bodies and a laboratory scanner. New verification bars (NVB) were fabricated based on these data. The linear and angular deviations between the implants were analyzed across the IOS, VBs, SVBs, and NVBs. Statistical analysis included Welch's ANOVA and post hoc testing (α = 0.05).</p><p><strong>Results: </strong>None of the VBs achieved a clinically passive fit. IOS-VB comparisons showed mean linear deviations of 14-77 µm, with four measurements >100 µm. Mean deviations between VBs and SVBs ranged from 35 to 173 µm, with 20 measurements >100 µm. In contrast, SVB-NVB mean deviations ranged from 4 to 27 µm, with only one >100 µm. All NVBs demonstrated a clinically passive fit and no significant differences were observed between the SVBs and NVBs (P > 0.05).</p><p><strong>Conclusions: </strong>Under the specific conditions of this proof-of-concept study, a combined digital-correction workflow using reverse-scan bodies and integrated titanium base abutments achieved clinically acceptable outcomes. However, multiple variables were modified simultaneously; therefore, the contribution of each step to the final passive fit could not be isolated.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148963447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexural strength and flexural modulus of repaired 3D-printed denture base resin: Effects of reinforcement and thermal cycling.","authors":"Ayaka Ito, Tomohiro Kawaguchi, Ami Tanaka, Hakuhei Morita, Hayato Nishi, Ippei Hamanaka, Takashi Tsuzuki","doi":"10.2186/jpr.JPR_D_26_00101","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_26_00101","url":null,"abstract":"<p><strong>Purpose: </strong>This study evaluated the effects of reinforcement materials and thermal cycling (TC) on the flexural strength and modulus of repaired three-dimensional (3D)-printed denture base resin.</p><p><strong>Methods: </strong>Specimens were fabricated from a 3D-printed denture base resin and assigned to five groups: positive control (PC; intact), negative control (NC; repaired with autopolymerizing resin only), metal repair (MR), fiber repair-thin (FR-thin), and fiber repair-thick (FR-thick). Each group was further subdivided into no TC (NTC) and TC (10,000 cycles) conditions. Flexural strength and modulus were measured using a three-point bending test. Data (n = 10 per group) were analyzed using nonparametric statistical methods (α = 0.05).</p><p><strong>Results: </strong>Under both NTC and TC conditions, the NC group exhibited the lowest flexural strength and modulus (P < 0.05). The FR-thick group demonstrated the highest flexural strength and modulus, and after TC, its flexural strength was comparable to that of the PC group (P > 0.05). Failure mode analysis showed complete fractures in the PC and NC groups, whereas the MR and FR-thick groups consistently exhibited incomplete fractures regardless of TC. TC significantly reduced the flexural strength and modulus in all groups except the FR-thin group (P < 0.05).</p><p><strong>Conclusions: </strong>Thick glass fiber reinforcement yielded the greatest improvement in the flexural strength and modulus of the tested vat-photopolymerization-based 3D-printed denture base resin after repair. Following TC, the flexural strength of the FR-thick group was comparable to intact specimens, and its flexural modulus remained the highest among all groups.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148919989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dental prosthetic treatment outcomes in patients with xerostomia and hyposalivation: A scoping review.","authors":"Taro Mukaibo, Yusuke Kondo, Takashi Munemasa, Tomotaka Nodai, Mizuki Takahashi, Tetsuya Muranaka, Ryuji Hosokawa, Chihiro Masaki","doi":"10.2186/jpr.JPR_D_26_00006","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_26_00006","url":null,"abstract":"<p><strong>Purpose: </strong>This scoping review aimed to map the association between xerostomia and/or hyposalivation and dental prosthetic treatment outcomes and identify knowledge gaps.</p><p><strong>Study selection: </strong>Two reviewers independently searched the PubMed and Scopus databases in accordance with the PRISMA extension for Scoping Reviews (PRISMA-ScR). Studies involving patients (≥18 years) with xerostomia and/or hyposalivation who underwent prosthetic treatment were included. Randomized controlled trials, cohort studies, cross-sectional studies, and case series with 10 or more cases were eligible. Results were synthesized narratively.</p><p><strong>Results: </strong>Thirty-three studies were included. For implant-supported prostheses, implant survival rates in patients with xerostomia and/or hyposalivation were generally high. In patients with radiation-induced hyposalivation, greater xerostomia severity and higher radiation doses at the implant site were associated with implant failure in individual observational studies. For removable dentures, xerostomia and/or hyposalivation were consistently associated with lower patient and masticatory satisfaction, and impaired function. However, denture adhesives improved retention in patients with hyposalivation. For fixed restorations, limited evidence from a single retrospective cohort study has suggested an increased risk of restoration failure. Subjective xerostomia perception was more strongly associated with oral health-related quality of life than the objective salivary flow rate.</p><p><strong>Conclusions: </strong>Although dental implants generally achieve high survival rates in patients with xerostomia and/or hyposalivation, they may be impaired by certain conditions such as radiation dose at the implant site. These findings are predominantly based on short- to medium-term observations, and comprehensive biological or functional success remains insufficiently examined. Significant knowledge gaps persist, and well-designed clinical studies are required to establish evidence-based treatment strategies.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148920038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Artificial intelligence in dental clinical decision support: Concept, challenges, and progress.","authors":"Peisheng Zeng, Gengbin Cai, Shijie Chen, Longshiyu Qiu, Zhuohong Gong, Xuejing Gan, Hengyi Liu, Hui Chen, Mengru Shi, Zhuofan Chen, Zetao Chen","doi":"10.2186/jpr.JPR_D_26_00138","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_26_00138","url":null,"abstract":"<p><strong>Purpose: </strong>In this review, we propose and elaborate on the conceptual framework of \"decision support intelligence\" (DSI) in dentistry. We aimed to define DSI as the intelligent execution of evidence-based clinical decision trees, outline a preliminary implementation pathway, identify key technical challenges hindering its development, and summarize the current research progress across major dental specialties to guide future artificial intelligence (AI) integration in clinical decision-making.</p><p><strong>Study selection: </strong>We searched for studies using major databases including PubMed, Web of Science, and IEEE Xplore, to construct a coherent conceptual framework and illustrate the key arguments.</p><p><strong>Results: </strong>The transition toward intelligent dentistry remains incomplete, with \"operational intelligence\" maturing while DSI lags. This review is the first to report the core concept of DSI as an intelligent execution of decision trees that simulate clinical reasoning. It outlines the preliminary implementation strategies and key developmental challenges.</p><p><strong>Conclusions: </strong>This review may accelerate the translation of AI from research to practical clinical tools, ultimately supporting dentists in making more standardized, efficient, and evidence-based decisions, reducing workload, and minimizing errors, particularly in resource-variable settings.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148920020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Load distribution for screw-retained fixed dental prostheses with different implant-abutment connection: A nonlinear finite element analysis.","authors":"Diler Deniz, Nigar Baghirova, Kıvanç Akça","doi":"10.2186/jpr.JPR_D_26_00036","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_26_00036","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this nonlinear finite element analysis study was to assess the impact of two different implant-restoration connection types on stress distribution at implant components and bone as well as displacement at the implant-abutment-restoration interface.</p><p><strong>Methods: </strong>Two different implant-restoration connection types (indirect and direct) were utilized in the modeling process, and two implant-supported distal 3-unit cantilevered restorations with surrounding bone were designed. Nonlinear friction contact was defined between the implant, abutment, cap, and occlusal screw components for indirect implant-restoration connection and between the implant, abutment, and screw components for direct implant-restoration connection. Vertical and oblique forces were applied separately to the restorations under four different loading conditions. The study assessed both the magnitude and distribution of the Von Mises stresses, as well as the characteristics of displacement.</p><p><strong>Results: </strong>Oblique load conditions resulted in increased stress and displacement values at the implant-abutment complex. Especially in the direct implant-restoration connection, the stress values in the screws and implants were notably higher. The highest displacement was observed in the screws for the indirect connection and in the abutments for the direct connection.</p><p><strong>Conclusions: </strong>Connection design may influence stress, strain, and displacement within the implant-abutment complex and surrounding bone. Different types of implant-restoration connections may lead to variations in these biomechanical parameters. Further clinical studies are required to evaluate the clinical relevance of these findings.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148829580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}