Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry最新文献

{"title":"Assessing readability and accuracy of content produced by the American College of Prosthodontists and large language models for patient education in prosthodontics.","authors":"Soni Prasad, Merve Koseoglu, Stavroula Antonopoulou, Heidi Marie Huber, Atousa Azarbal, Sri Kurniawan, Cortino Sukotjo","doi":"10.1111/jopr.70022","DOIUrl":"https://doi.org/10.1111/jopr.70022","url":null,"abstract":"<p><strong>Purpose: </strong>This study aims to evaluate the readability and accuracy of content produced by ChatGPT, Copilot, Gemini, and the American College of Prosthodontists (ACP) for patient education in prosthodontics.</p><p><strong>Materials and methods: </strong>A series of 26 questions were selected from the ACP's list of questions (GoToAPro.org FAQs) and their published answers. Answers to the same questions were generated from ChatGPT-3.5, Copilot, and Gemini. The word counts of responses from chatbots and the ACP were recorded. The readability was calculated using the Flesch Reading Ease Scale and Flesch-Kincaid Grade Level. The responses were also evaluated for accuracy, completeness, and overall quality. Descriptive statistics were used to calculate mean and standard deviations (SD). One-way analysis of variance was performed, followed by the Tukey multiple comparisons to test differences across chatbots, ACP, and various selected topics. The Pearson correlation coefficient was used to examine the relationship between each variable. Significance was set at α < 0.05.</p><p><strong>Results: </strong>ChatGPT had a higher word count, while ACP had a lower word count (p < 0.001). The cumulative scores of the prosthodontist topic had the lowest Flesch Reading Ease Scale score, while brushing and flossing topics displayed the highest score (p < 0.001). Brushing and flossing topics also had the lowest Flesch-Kincaid Grade Level score, whereas the prosthodontist topic had the highest score (p < 0.001). Accuracy for denture topics was the lowest across the chatbots and ACP, and it was the highest for brushing and flossing topics (p = 0.006).</p><p><strong>Conclusions: </strong>This study highlights the potential for large language models to enhance patient's prosthodontic education. However, the variability in readability and accuracy across platforms underscores the need for dental professionals to critically evaluate the content generated by these tools before recommending them to patients.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144976043","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":"Assessment of microbial adherence and patient satisfaction with conventional and digital 3D-printed complete removable dentures: A crossover randomized controlled clinical trial.","authors":"Heba R Elsarrif, Ayman F Elawady, Omnia M Refai","doi":"10.1111/jopr.70017","DOIUrl":"https://doi.org/10.1111/jopr.70017","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to assess and compare the effect of material type on microbial colonization over time and patient satisfaction between 3D-printed computer-aided design and computer-aided manufacturing (CAD-CAM) and conventional dentures.</p><p><strong>Materials and methods: </strong>This crossover randomized controlled clinical trial included 11 completely edentulous patients, each receiving two types of complete dentures: conventional dentures (comparator group) and 3D-printed CAD-CAM dentures (intervention group). Patients were randomly assigned to begin with one set of dentures and then switched to the other after 3 months, with a washout period of 2 weeks. Microbiological assessments were conducted at three time points: at the time of denture insertion (T0), after 1 month (T1), and after 3 months (T2). Patient satisfaction was evaluated 3 months post-insertion.</p><p><strong>Results: </strong>Microbial counts were significantly higher in the comparator group than in the intervention group at T1 (3.87 ± 0.07 vs. 3.78 ± 0.09, p = 0.023) and T2 (5.04 ± 0.03 vs. 4.98 ± 0.04, p < 0.001), with no significant difference at baseline (T0, p = 0.392). Both groups showed progressive increases in microbial counts over time; however, the comparator group consistently exhibited higher counts. Patient satisfaction was slightly higher in the intervention group (59 [57-62]) compared with the comparator group (58 [56-61]), although the difference was not statistically significant (p = 0.230).</p><p><strong>Conclusion: </strong>The 3D-printed CAD-CAM dentures exhibited significantly lower microbial counts than conventional dentures throughout the 3 months. Additionally, patient satisfaction was slightly higher with 3D-printed dentures; however, the difference was not statistically significant.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144975989","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":"Bond strength enhancement for additively manufactured zirconia: Micro-retentive design approach.","authors":"Rama B Al-Rashdan, Charles Beard, Fei Liu, Berna Saglik, Bashar A Al-Rashdan, Khaled Q Al Hamad","doi":"10.1111/jopr.70018","DOIUrl":"https://doi.org/10.1111/jopr.70018","url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the effect of digitally designed micro-retention features on the bond strength of additively manufactured (AM) zirconia copings.</p><p><strong>Materials and methods: </strong>Sixty titanium base abutments (NobelParallel, NobelBiocare), pretreated with 50 µm alumina particles were divided into four groups (n = 15 per group); one group with subtractively manufactured zirconia copings (SM), and three test groups comprising one group with AM zirconia copings without any intaglio surface modification (AM-N), and two groups with digitally designed inverted pyramid-shaped micro-textures incorporated to the intaglio surface of the AM zirconia copings with two sizes: Ra 120 µm (AM-120) and Ra 240 µm (AM-240). All copings were bonded to the abutments using a conventional resin cement (Multilink Hybrid). Pull-off tensile strength was measured with a universal testing machine (Instron), and statistical analysis was performed using analysis of variance and post-hoc test.</p><p><strong>Results: </strong>Mean tensile strength values were 574.5 N for the SM group and 450.7 N, 990.8 N, 1097 N, for AM-N, AM-120, and AM-240, respectively. No statistically significant difference was found between the SM and AM-N groups (p > 0.05) or between the AM-120 and AM-240 groups (p > 0.05). However, the AM-120 and AM-240 groups demonstrated significantly higher tensile strength compared to the SM and AM-N groups (p < 0.001).</p><p><strong>Conclusion: </strong>Provision of inverted micro-textured pyramidal shapes provided a simulation of etched surfaces to the intaglio surface of AM zirconia copings and significantly enhanced their retention strength to Ti-base abutments compared to subtractive and non-textured AM zirconia.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144976028","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":"Influence of the printing technologies, storage conditions, and storage time on the intaglio surface accuracy of additively manufactured edentulous surgical guides: An in vitro study.","authors":"Yiping Gu, Shengtao Yang, Siyu Wang, Li Yue, Quan Yuan","doi":"10.1111/jopr.70019","DOIUrl":"https://doi.org/10.1111/jopr.70019","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the effects of printing technologies, storage conditions, and storage time on the intaglio surface accuracy of additively manufactured maxillary edentulous surgical guides.</p><p><strong>Materials and methods: </strong>Forty-eight maxillary edentulous surgical guides were fabricated using three different printing technologies (n = 16): DLP (digital light processing), PJ (polyjet), and SLA (stereolithography). After postprocessing, each group was randomly divided into 2 storage conditions: dark storage (D) and light exposure storage (L). The intaglio surface of each specimen was scanned by a laboratory scanner on storage days 0, 3, 7, 14, and 28, respectively. The digital design file served as the reference, and each digitized specimen was superimposed onto the reference file using a 3-dimensional (3D) analysis software program. The root mean square (RMS) error was used to calculate trueness. The percentage of measurement data points within 1 standard deviation was used to demonstrate precision. Repeated-measures ANOVA was used to analyze the data (α = 0.05).</p><p><strong>Results: </strong>Printing technologies (p < 0.001) and storage time (p < 0.001) significantly affected the intaglio surface accuracy of additively manufactured maxillary edentulous surgical guides. The DLP group exhibited the best printing accuracy at Day 0, with a significant decline in accuracy from Day 0 to Day 28. On the contrary, the PJ group and SLA group demonstrated superior stability during the 1-month storage. No statistical significance was found between dark storage and light exposure groups (p > 0.05).</p><p><strong>Conclusion: </strong>Group DLP had the highest accuracy after manufacturing. Storage time only affected the accuracy of group DLP. Storage conditions had no effect on the three groups tested.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144976033","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 systematic reviews and their shortcomings based on umbrella reviews.","authors":"Saud S Alajmi, Charles J Goodacre, Gary Goldstein","doi":"10.1111/jopr.70025","DOIUrl":"https://doi.org/10.1111/jopr.70025","url":null,"abstract":"<p><strong>Purpose: </strong>Evidence-based dentistry has progressed from case reports and series to best evidence consensus statements; to non-randomized and randomized controlled studies; to systematic reviews (SRs), which analyze individual studies; and to umbrella reviews (URs), which now evaluate SRs. The purpose of this article is to review and summarize the findings of recent dental URs selected by the authors because they analyzed the quality of SRs, identified their strengths and weaknesses, and represented multiple disciplines of dentistry and diverse journals.</p><p><strong>Materials and methods: </strong>A PubMed search was completed using the keywords \"umbrella review, dentistry\" and the filters \"meta-analysis\" and \"systematic review\" along with the years 2022-2024. There were 93 URs listed, with 56 being dental-related. The 56 URs were reviewed, and 15 were collectively selected by the authors to be summarized as examples of multiple dental disciplines and dental-related treatments published in a diverse group of dental journals.</p><p><strong>Results: </strong>The 15 selected URs exhibited similar formats with findings based on the included SRs. The results of the 15 URs are summarized and presented along with the strengths and weaknesses noted in the SRs.</p><p><strong>Conclusions: </strong>The URs included in this article assessed the quality of SRs based on AMSTAR 2 (AMSTAR 2 is a critical appraisal tool used to assess the methodological quality of systematic reviews, particularly those focusing on healthcare interventions), ROBIS (ROBIS is the first rigorously developed tool designed specifically to assess the risk of bias in systematic reviews), and PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. Deficiencies were reported relative to the following items: failure to register the protocol before starting the review; incomplete literature search; absence of a list of excluded studies and lack of justification for the exclusions; inadequate review methods; lack of reporting the sources of funding; failing to assess risk of bias (ROB) or an unsatisfactory technique to assess ROB; not listing potential sources of conflict of interest; and lack of homogeneity in the study design, which prevented performing a meta-analysis. These findings indicate the need for careful study of SR and UR guidelines related to design and review, assessment of bias risk, and review reporting before applying the conclusion to clinical practice. Clinicians need to be aware of the deficiencies present in SRs and URs. Also, it is important to recognize that reviews are based on only those studies that met the inclusion criteria of the authors, and the exclusion of studies is fraught with potential bias.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144975971","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":"Autonomous robotic surgery for sinus lateral window preparation and simultaneous dental implant placement: A proof of concept.","authors":"Xiaoying Qiu, Jiang Li, Lvhua Guo, Chengji Gong, Ping Li, Jiangyong Huang","doi":"10.1111/jopr.70016","DOIUrl":"https://doi.org/10.1111/jopr.70016","url":null,"abstract":"<p><strong>Purpose: </strong>To present a novel protocol of sinus lateral window preparation and simultaneous dental implant placement using an autonomous robotic system.</p><p><strong>Materials and methods: </strong>The novel protocol consists of (1) preoperative data acquisition: cone beam computed tomography (CBCT) and intraoral scan; (2) preoperative design and surgery planning; (3) marker design, fabrication, and fixation; (4) registration and calibration; (5) osteotomy of the lateral window by a robotic system and elevation of the sinus membrane; (6) implant osteotomy simultaneously performed by an autonomous robotic system; (7) bone augmentation and implant placement; and (8) postoperative procedures: CBCT acquisition and accuracy assessment, if applicable.</p><p><strong>Result: </strong>The protocol was an effective method for sinus lateral window preparation and simultaneous dental implant placement, with no reported intraoperative complications. Meanwhile, this technique exhibited exceptional control in depth during the creation of the lateral window, with the minimum deviation reached within 0.04 mm in a case. The trueness of the window site and implant placement was clinically acceptable.</p><p><strong>Conclusions: </strong>The autonomous robotic surgery demonstrates potential as a viable alternative to conventional freehand techniques for sinus lateral window preparation and dental implant placement. Conceptual validation indicates this approach may enhance precision, minimize invasiveness, and reduce complication risks. Further clinical studies are warranted to confirm the efficacy and safety of the protocol.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144785774","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 convergence angle of tooth preparation on the fracture resistance of incisor monolithic zirconia crowns.","authors":"Zeynep Ozkurt-Kayahan, Fusun Ozer, Irem Celikyurek Karabagli, Ender Kazazoglu, Markus B Blatz","doi":"10.1111/jopr.70014","DOIUrl":"https://doi.org/10.1111/jopr.70014","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the effect of convergence angles on the fracture resistance of monolithic zirconia crowns in maxillary central incisors.</p><p><strong>Materials and methods: </strong>A maxillary central incisor preparation was digitally designed with four different angles (0°, 8°, 16°, and 22°). For each group, 10 abutment teeth were manufactured using a 3D printer with photosensitive resin and positioned in a maxillary typodont model for scanning procedures. Anatomically contoured monolithic zirconia crowns were fabricated for each group (n = 10), 40 crowns in total, using the subtractive manufacturing technique. The crowns were cemented onto their respective abutments using a self-adhesive resin cement. Fracture resistance testing was conducted using a universal testing machine and the fracture load was recorded in Newtons (N). The obtained data were statistically analyzed using one-way ANOVA for intergroup comparisons, and Tukey HSD post-hoc test was applied to identify significant differences among groups (p < 0.05).</p><p><strong>Results: </strong>A statistically significant difference was found among the groups, with fracture resistance varying according to the convergence angle (p < 0.05). Crowns with 16° angle exhibited the highest values (2897.57 N), followed by 22° (2425.58 N) and 8° (2095.76 N) groups. The lowest value was found at 0° crowns (1830.3 N).</p><p><strong>Conclusions: </strong>The results indicated that the convergence angle had a significant effect on the fracture resistance of monolithic zirconia crowns. Instead of preparing parallel axial walls (0°) in central incisors, creating a tapered preparation design with different levels (8°, 16°, or 22°) increased the fracture resistance. Specifically, 16° was related to the greatest fracture resistance. However, the absence of thermocycling and fatigue testing limits the simulation of long-term clinical performance.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144776722","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":"Technique for retrieving a locked implant-supported bar overdenture following direct attachment pick-up procedure.","authors":"Weiqing Liu, Toshiki Nagai, Daizo Ishiguro, Wei-Shao Lin","doi":"10.1111/jopr.70015","DOIUrl":"https://doi.org/10.1111/jopr.70015","url":null,"abstract":"<p><p>Implant-assisted complete dentures, particularly those utilizing implant-supported bar systems (RP-4), offer significant advantages in patient satisfaction and prosthetic function compared to conventional dentures. However, complications can arise during the direct intraoral pick-up procedure, such as inadvertent resin polymerization in undercut areas, which may lock the overdenture in place. This report introduces a predictable, digitally guided technique to retrieve a locked implant-supported bar overdenture using the original digital design to locate screw access channels and guide targeted occlusal drilling. The method enables the removal of the prosthesis with minimal damage, allowing for chairside repair without the need to remake the denture. This approach enhances the management of such complications and aligns with modern digital workflows in prosthodontics.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144776723","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":"Clinical and esthetic outcomes of screw-retained internal-connection veneered zirconia-ceramic CAD-CAM abutments in single implant reconstructions: Five-year results of a prospective case series investigation.","authors":"Rafael Del Castillo, Lourdes Gutiérrez-Garrido, Miguel Padial-Molina, Carlo Ercoli, Pablo Galindo-Moreno","doi":"10.1111/jopr.70002","DOIUrl":"https://doi.org/10.1111/jopr.70002","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the long-term clinical performance and survival, as well as the biological, esthetic, and technical complications of one-piece, internally-connected, screw-retained, computer aided-design and computer aided-manufacturing (CAD-CAM) veneered zirconia anterior and posterior implant-supported single restorations fabricated on regular diameter implants.</p><p><strong>Materials and methods: </strong>Following a 2-stage surgical procedure, 22 implants placed in anterior and posterior areas in 21 partially edentulous patients (mean age of 55 years; 9 males/12 females) were evaluated in terms of plaque index, pocket probing depth, bleeding on probing, level of oral hygiene, signs of mucositis/peri-implantitis, esthetic score, gingival zenith position, Papilla Index Score, thickness of peri-implant gingiva, radiographic marginal bone loss, and technical complications. Implants and restorations were prospectively followed from the insertion of the restoration (baseline), and up to 5 years postloading.</p><p><strong>Results: </strong>After 5 years, radiological bone stability with no marginal bone loss (0.4 [0.4] vs. 0.5 [1.1] mm from 1- to 5-year follow-up) was recorded, with a 100% implant survival rate. Clinically, patients performed adequate oral hygiene, and tissues were kept healthy as determined by plaque index (PI) and oral hygiene index (OHI). The esthetic performance of the restorations revealed an increase in mucosal thickness from 3.2 (0.9) mm after 1 year to 3.3 (1.1) mm after 5 years, and a reduction in the gingival zenith position from 7.9 (1.5) mm after 1 year to 7.7 (1.5) mm at the 5-year recall examination. The prosthetic survival rate after 5 years was 78.9%, as 4 abutments fractured at different time points during the study. All abutment fractures occurred in the mandible, at the level of the second premolars and first molars.</p><p><strong>Conclusions: </strong>After 5 years clinical function, Atlantis one-piece, screw-retained, internally connected CAD-CAM veneered zirconia implant-supported single crowns resulted in a relatively low survival rate, mainly associated with posterior single implant-supported reconstructions. However, due to the fact that the present clinical investigation used only one abutment design and reconstruction type, extrapolation of data to different implant systems, abutment designs, and reconstruction types must be cautious.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144754966","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":"Assessment of surface micro-roughness and de-torque of selective laser melting, cast, and machined implant abutments: An in vitro study.","authors":"Refal Albaijan, Fahim Vohra, Talal M Alnassar, Ali Robaian, Sarah M Alnafaiy, Khaled M Alzahrani, Abdullah H Alnasser, Abdullah Alshehri, Rawan Alkahtani, Ali Alrahlah, Khalid Gufran","doi":"10.1111/jopr.70012","DOIUrl":"https://doi.org/10.1111/jopr.70012","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this in vitro study was to assess the surface micro-roughness and de-torque measurement of selective laser melting (SLM) implant abutments in comparison to cast and machined implant abutments.</p><p><strong>Materials and methods: </strong>Forty abutment specimens were divided equally into four groups (n = 10) as follows: machined titanium (Ti) abutments (Control), cast cobalt-chromium (CoCr) abutments, SLM-CoCr abutments, and SLM-Ti abutments. Fabricated abutments were assessed for surface micro-roughness using a 3D optical noncontact surface microscope (Contour GT-K 3D Optical Microscope, Bruker, Tucson, Arizona, USA). In addition, abutment displacement was assessed using de-torque values. The abutments were torqued to the implant at 30 Ncm and retorqued after 15 min according to the manufacturer's recommendation using a Tohnichi BTGE digital torque gauge. After 2 min, preload reverse torque values (RTVs) measurements were performed. Before cyclic loading, the abutments were retorqued to the implant at 30 Ncm, and metal crowns were cemented to the abutments with a temporary cement (CharmTemp EU; DentKist Inc., Korea) using a 6 kg force applied for 10 min. After 24 h of cementation, the specimens were subjected to 5 kg of loads for 600,000 cycles at a frequency of 1 Hz using the chewing simulation machine. Immediately after the cyclic loading, the postload-RTVs were measured. This was performed to identify the comparative effect of fabrication techniques on the reverse torque difference (RTD). Data was assessed using Analysis of variance (ANOVA) and Tukey Post hoc comparison tests for all the variables. Pearson correlation was used to assess dependence between independent variables (surface roughness) and dependent variables (de-torque values).</p><p><strong>Results: </strong>SLM abutments were compared with the cast and machined abutments in the surface micro-roughness and de-torque values. SLM-Ti abutments showed a significantly rougher surface (p < 0.05) among the study groups with a mean Ra of 2.24 ± 0.36 µm. SLM-CoCr abutments were smoother than cast abutments with mean Ra of 1.30 ± 0.11 µm and 1.58 ± 0.17 µm, respectively (p < 0.05). For the de-torque test, mean preload RTVs of SLM-Ti (23.39 ± 3.74 Ncm) and SLM-CoCr (19.73 ± 1.97 Ncm) presented comparable (p > 0.05) results with cast CoCr (22.87 ± 2.21 Ncm). However, only the mean postload RTVs were significantly lower (p < 0.05) in SLM-CoCr (16.36 ± 3.90 Ncm) than machined Ti (20.52 ± 2.23 Ncm) abutments. There was no significant difference between the groups for RTDs (p > 0.05).</p><p><strong>Conclusion: </strong>SLM CoCr abutments showed a smoother surface than cast abutments, while SLM Ti abutments had the highest surface roughness in comparison with other groups. No significant difference was found between the groups for RTDs. No significant correlation was found between the surface roughness and postload RTVs. However, a negative correlation","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144745660","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}