The International journal of prosthodontics最新文献

{"title":"Effect of Number and Angulation of Implants on Accuracy of Digital Impression in Completely Edentulous Arch.","authors":"Yuyeon Kim, Donghyun Kim, Hyeonseong Son, Seoung-Jin Hong, Hyeong-Seob KIm, Ahran Pae","doi":"10.11607/ijp.9174","DOIUrl":"https://doi.org/10.11607/ijp.9174","url":null,"abstract":"<p><strong>Purpose: </strong>This study aims to evaluate the accuracy of the impression method using an intraoral scanner and the conventional method based on the implant number and angulation with multiple implants.</p><p><strong>Materials and methods: </strong>Six implants were placed in the maxillary edentulous typodont using 3D modeling software. Eight implants were placed in another maxillary edentulous typodont. The implant placement angulation for each model was different. 3D designing and printing were performed to produce reference models. These models were scanned to obtain reference scan data (RSD). In the conventional impression method, reference models were used, and a gypsum model was produced. Scan data was obtained by the lab scanner (Group CI). Models were scanned and the scan data was obtained (Group IS). The distance and angulation deviation were compared.</p><p><strong>Results: </strong>In models with six implants, except for the distance deviation in Model 6-20, the mean values of all distance and angulation deviations were lesser in Group CI than in Group IS (P < 0.05). In models with eight implants, except for the distance deviation in Model 8-20, the mean values of distance and angulation deviations were lesser in Group CI than in Group IS, and significant differences were observed between the two groups for Models 8-0, 8-10, and 8-20 (P < 0.05).</p><p><strong>Conclusion: </strong>In cases where multiple implants are placed in the completely edentulous arch in vitro, conventional impressions are more accurate than intraoral scans. In the cases of lack of implant parallelism, intraoral scans can be used as a replacement for conventional impressions.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"1-27"},"PeriodicalIF":0.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143367220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EAO News: How the Junior Committee of the EAO Has Influenced My Professional Development and Made a Lasting Impact on My Career.","authors":"Ignacio Sanz Sánchez","doi":"10.11607/ijp.8895","DOIUrl":"https://doi.org/10.11607/ijp.8895","url":null,"abstract":"","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"38 1","pages":"9-11"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Composite Restoration Design Effect During Curing and Chewing.","authors":"Canan Özcan, Philippe Lestriez, Yannick Josset","doi":"10.11607/ijp.8824","DOIUrl":"10.11607/ijp.8824","url":null,"abstract":"<p><strong>Purpose: </strong>To observe the effect of the cavity design of the direct composite restoration on a real case of the patient's tooth structures after applying mandibular kinematics with finite element analysis.</p><p><strong>Materials and methods: </strong>Four complex maxillomandibular models of the maxillary right second molar and mandibular right second molar were constructed from the patient's CBCT acquisition, and the patient's kinematic data recorded with Modjaw were added. Different shapes and sizes of mesio-occluso-distal (MOD) composite restorations were simulated, including the polymerization shrinkage of this material. Finite element analyses were used to observe the von Mises stresses occurring during polymerization and mastication.</p><p><strong>Results: </strong>The stresses were observed at the cavity margin, and the amplitude of the stresses was higher when the enamel volume was lower. The reduction in occlusal enamel volume with the open-angle vestibular and palatal walls resulted in a greater increase in stresses observed on the structures.</p><p><strong>Conclusions: </strong>The occlusal enamel is the area that bears the maximum masticatory stress, and the loss of this enamel volume generates a much greater concentration of stress on the underlying structures. It is important to preserve as much enamel tissue as possible when designing a cavity for a direct composite restoration.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"76-83"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140103138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Update on the Accuracy of Digital Implant Impressions: A Coordinate-Based Analysis.","authors":"Alexander Schmidt, Cara Berschin, Bernd Wöstmann, Maximiliane Amelie Schlenz","doi":"10.11607/ijp.8843","DOIUrl":"10.11607/ijp.8843","url":null,"abstract":"<p><strong>Purpose: </strong>To update data on the transfer accuracy of digital implant impressions using a coordinate-based analysis, the latest intraoral scanners (IOS) were investigated in an established clinical close model setup.</p><p><strong>Materials and methods: </strong>An implant master model (IMM) of the maxilla with four implants in the posterior area (maxillary first premolars and first molars) and a reference cube were scanned 10 times each with four different IOS: i700 (i7; Medit), Primescan (PS; Dentsply Sirona), and Trios 4 (T4) and Trios 5 (T5; 3Shape). Datasets were compared to a reference dataset of IMM that was generated with x-ray computed tomography in advance. 3D deviations for the implant-abutment interface points (IAIPs) were calculated. Statistical analysis was performed by multifactorial ANOVA (P < .05).</p><p><strong>Results: </strong>Overall deviations for trueness (mean) ± precision (SD) of the IAIPs ranged from 88 ± 47 μm for PS, 112 ± 57 μm for i7, 121 ± 42 μm for T4, and 124 ± 43 μm for T5 with decreasing accuracy along the scan path. For trueness, a significant difference between the PS and the T4 was detected for one implant position. For precision, no significant differences were noticed.</p><p><strong>Conclusions: </strong>Although the latest IOS showed a significant improvement in transfer accuracy, the accumulating deviation along the scan path is not yet resolved. Considering the Trios system, the innovation seems to be limited because no improvement could be detected between T4 and T5.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"104-110"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140295686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Comparative Evaluation of Prosthetic and Biologic Outcomes as Influenced by Two Different Implant Restorative Materials: A Prospective, Split-Mouth Study.","authors":"Taniya Malhotra, Bhupender Kumar Yadav, Sumit Singh Phukela, Amit Bhardwaj, Manisha Khandait, Abhishek Nagpal, Omkar Shetty","doi":"10.11607/ijp.8729","DOIUrl":"10.11607/ijp.8729","url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the prosthetic parameters, clinical indices, crestal bone levels, and inflammatory biomarkers in peri-implant crevicular fluid (PICF) as influenced by two different implant restorative materials-metal-ceramic and monolithic zirconia-at baseline, 1 year, and 2 years.</p><p><strong>Materials and methods: </strong>A total of 20 patients with bilateral implants placed in the same arch were selected. A monolithic zirconia (Mono-ZrO2; 4Y-PSZ) crown was placed on one side, and a metal-ceramic crown was placed on the contralateral side after randomization. Interproximal marginal bone level, clinical parameters, MMP-8 levels in PICF, and prosthetic characteristics (as determined by modified United States Public Health Service [USPHS] criteria) were evaluated at baseline and at 1-year and 2-year follow-ups. Data were descriptively examined. The results were evaluated using chi-square test, ANOVA, and Student t test. At P < .05, statistical significance was determined.</p><p><strong>Results: </strong>A total of 20 metal-ceramic crowns and 20 Mono-ZrO2 crowns were delivered. A 100% survival of the implants and prosthetic crowns was achieved across all patients, with no instances of failure noted throughout the 2-year follow-up period. The periodontal changes observed in the participants were analyzed and demonstrated statistically insignificant alterations. Prosthetic alterations were assessed according to USPHS criteria, revealing minor ceramic chippings and instances of screw loosening within the metal-ceramic group during both the 1- and 2-year follow-up periods. These incidents were collectively categorized as technical issues. Regarding anatomical form and color match to the surrounding dentition, Mono-ZrO2 crowns obtained much lower evaluations when compared to metalceramic crowns. However, when evaluating the loss of marginal bone and level of inflammatory markers, there were no discernible variations between the groups.</p><p><strong>Conclusions: </strong>The null hypothesis that there would be no similarity in the survival rates and interactions at the peri-implant interface between the two types of restorations was rejected. Mono-ZrO2 and metal-ceramic crowns demonstrated no statistical differences across all parameters examined in the present prospective investigation.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"35-45"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140900794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D-Printed Zirconia and Lithium Disilicate in Dentistry and Their Clinical Applications.","authors":"Wei-Shao Lin, Li Chen, Amal Alfaraj","doi":"10.11607/ijp.8831","DOIUrl":"10.11607/ijp.8831","url":null,"abstract":"<p><p>This review focuses on the progressive role of 3D printing in dentistry, particularly emphasizing the use of zirconia-based and lithium disilicate (LS2)-based ceramic materials. Celebrated for their biocompatibility and esthetic resemblance to natural teeth, these materials have shown promising results with high success rates. Digital light processing (DLP) and stereolithography (SLA) have been noted for producing superior 3D-printed ceramic products. Despite facing challenges such as surface defects, mechanical strength limitations, and esthetic inconsistencies, active research is dedicated to refining the quality and esthetics of 3D-printed zirconia-based and LS2-based ceramics. This review acknowledges the need to mitigate the steep costs of this manufacturing form and recognizes the current shortfall in clinician and technician awareness of these advanced techniques. Addressing these issues through focused research on improving surface quality, dimensional accuracy, and mechanical properties of 3D-printed dental prostheses is crucial, as is enhancing the dental community's understanding and acceptance of this innovative technology.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":" ","pages":"12-26"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141904104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stresses in Premolars Restored Using Different Post-and-Core and Crown Materials: A Finite Element Analysis Study.","authors":"Tatjana Maravić, Claudia Mazzitelli, Allegra Comba, Uros Josic, Federico Del Bianc, Annamaria Forte, Darko Vasiljević, Larisa Blažić, Lorenzo Breschi, Annalisa Mazzoni","doi":"10.11607/ijp.8839","DOIUrl":"10.11607/ijp.8839","url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the influence of three post-and-core systems and two crown materials on stresses in restored premolars using finite element analysis (FEA).</p><p><strong>Materials and methods: </strong>A maxillary second premolar 3D model was created in SolidWorks 2014 (Dassault Systémés). Severe loss of tooth structure was simulated with six restorative options: (1) glass-fiber-reinforced composite post and composite core (GFRC) &#43; CAD/CAM leucite-reinforced glass-ceramic crown (LRC); (2) carbon-fiberreinforced composite post and composite core (CFRC) &#43; LRC; (3) metal cast post-and-core (MPC) &#43; LRC; (4) GFRC &#43; CAD/CAM composite resin crown (CC); (5) CFRC &#43; CC; and (6) MPC &#43; CC. Three-point occlusal loading (150 N) was simulated and von Mises and maximum principal stresses were calculated.</p><p><strong>Results: </strong>Although maximum von Mises stresses in the crown and dentin were similar across groups (137.9 to 139.2 MPa crown; 17.2 to 19.6 dentin), there were important differences in stress distribution in dentin. Maximum stresses were on the bottom of the post preparation cavity only in the MPC &#43; CC group. Stress values for the posts were CFRC (4.8 MPa) > GFRC (6.7 MPa) > MPC (10.3 MPa). CC-restored models presented higher von Mises stresses for the post-and-core compared to the LRC groups. Maximum principal stresses were lower compared to von Mises stresses, following the same trend, and were distributed similarly in all groups.</p><p><strong>Conclusions: </strong>Both GFRC and CFRC showed favorable stress distribution in the dentin and restorative materials, while MPC increased stresses in the core, post, and post cement. The more rigid crown material seems to transmit less stress to the underlying core and crown cement compared to CC.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"93-103"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140295685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Maxillary All-on-6 Treatment Using Zygomatic Implants. Bone Loss Evaluation by CBCT: 3-Year Follow-up.","authors":"Amira Mokhtar Abouelhuda, Abdallah Mohammed Ibrahim, Mohammed Hassan Elkenawy, Salah Abd ElFattah Hegazy","doi":"10.11607/ijp.8744","DOIUrl":"10.11607/ijp.8744","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate radiographic changes around six implants (two posterior zygomatic implants and four conventional implants) used with fixed detachable restorations in patients with severe maxillary posterior resorption with either polyether ether ketone (PEEK) or titanium frameworks.</p><p><strong>Materials and methods: </strong>In total, 12 maxillary edentulous patients were rehabilitated with six implants, including two posterior zygomatic and four conventionally placed implants for each patient following All-on-6 distribution and opposing a mandibular All-on-4 implant-retained fixed detachable prosthesis. A two-stage surgical unloaded healing protocol was performed. According to framework and teeth materials, there were two groups: group 1- CAD/CAM-milled framework from modified BioHPP PEEK bonded to PMMA crowns; and group 2-screwretained CAD/CAM-milled framework from titanium bonded to zirconia crowns. Bone loss evaluation for six implants was performed using CBCT at the time of delivery (T0), after 1 year (T1), and after 3 years (T2).</p><p><strong>Results: </strong>There was a statistically significant difference in bone loss between the PEEK and titanium groups. There was less bone loss in the PEEK group around anterior conventional implants at buccal (P = .01), mesial (P < .001), and distal surfaces (P < .001) and for zygomatic implants at buccal (P = .004) and palatal surfaces (P = .003).</p><p><strong>Conclusions: </strong>Within the limitations of the study, the full-arch PEEK and titanium frameworks of fixed-detachable prostheses used with an All-on-6 distribution using zygomatic implants for rehabilitation of maxillary edentulous atrophied posterior arches was a promising treatment approach. Less bone loss was observed with the PEEK framework restorations combined with the PMMA crowns group.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"46-54"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41165696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The 'One Customized Abutment One Time' Concept-An Innovative Technique for Optimizing Immediacy and Digital Protocols.","authors":"Mohit Kheur, Supriya Kheur, Tabrez Lakha, Prajakta Dongre, Ronald E Jung, Daniel Thoma","doi":"10.11607/ijp.8603","DOIUrl":"10.11607/ijp.8603","url":null,"abstract":"<p><p>Multiple disconnection and reconnection of abutments has been known to affect the mucosal barrier around implants, leading to marginal bone loss (MBL). This clinical report describes a novel technique that amalgamates the benefits of digital technologies including the fabrication of surgical guides for implant placement, customized hybrid zirconia abutments, and all-ceramic lithium disilicate crowns prior to implant placement. Correct 3D implant positioning, along with immediate placement of the definitive hybrid customized abutment and a lithium disilicate crown, have the potential to reduce treatment time, visits, and costs while delivering optimal esthetic outcomes.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"138-143"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Color Alterations, Flexural Strength, and Microhardness of 3D-Printed Resins Treated in Different Coloring Agents.","authors":"Kevser Kurt Demirsoy, S Kutalmış Buyuk, Serdar Akarsu, Melek Hilal Kaplan, Huseyin Simsek, Feridun Abay","doi":"10.11607/ijp.9043","DOIUrl":"10.11607/ijp.9043","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the color alterations, flexural strength, and microhardness properties of two different 3D-printed permanent crown resins.</p><p><strong>Materials and methods: </strong>Samples were produced from two different 3D-printed permanent crown resins: Group 1 (Saremco Crowntec, Saremco Dental) and Group 2 (P-crown V2, Senertek). Color changes (ΔE values), flexural strength, and Vickers hardness number (VHN) of the samples were calculated. Data were analyzed with Shapiro-Wilk normality test, independent t test, and Mann-Whitney U tests. The significance level was accepted as P < .05.</p><p><strong>Results: </strong>ΔE values for red wine were found to be significantly higher in Group 1 (6.43 ± 2.26; P < .001). The flexural strength values (MPa) of Group 1 were significantly higher than Group 2 in all three solutions (P < .001). There was no significant difference between the VHN values of the samples kept in wine and coffee solutions (P = .271; .827).</p><p><strong>Conclusions: </strong>3D-printing resins are affected at different levels by coloring solutions. Microhardness and flexural strength of 3D-printed samples kept in different coloring agents are different. In the use of 3D-printing resins, product selection should be made by taking into account the individual factors such as the eating and drinking habits of the patient and the physical properties expected from the sample.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"111-118"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140898579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}