Journal of Prosthetic Dentistry最新文献

{"title":"Wear resistance of 3D printed, milled, and prefabricated methacrylate-based resin materials: An in vitro study.","authors":"Passupang Veerapeindee, Pimduen Rungsiyakull, Wissanee Jia-Mahasap","doi":"10.1016/j.prosdent.2024.12.006","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.12.006","url":null,"abstract":"<p><strong>Statement of problem: </strong>Three-dimensional (3D) printing and milling technologies have been increasingly used in prosthodontic practice for fabricating digital prostheses. Nevertheless, evidence relating to the wear resistance of denture teeth fabricated using these methods is lacking.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to compare the wear resistance exhibited by denture teeth fabricated using 3D printing and milling technologies with prefabricated denture teeth.</p><p><strong>Material and methods: </strong>Fifty specimens of resin denture teeth from 3 types of manufacturing processes were prepared and divided into 5 groups: 1 group of 3D printed denture teeth (NextDent C&B MFH), 2 groups of milled denture teeth (Ivotion Dent and VIPI Block), and 2 groups of prefabricated denture teeth (Major Dent and Cosmo HXL). Each group of specimens was occluded with a zirconia antagonist under a 49-N load with thermocycling conditions for 120 000 cycles. The antagonist was horizontally displaced back and forth at a 2-mm distance and a frequency of 1.6 Hz. The quantification of the volume loss and the maximal wear depth of the worn specimens were recorded, while the wear characteristics were assessed with a scanning electron microscope (SEM). Data were analyzed using the Kruskal-Wallis test followed by pairwise comparison tests (α=.05).</p><p><strong>Results: </strong>Significantly different wear depths and volume losses were found among groups (P<.05). The highest wear depth and volume loss were observed in the VIPI Block (0.513 ±0.147 mm and 3.094 ±0.790 mm³), followed by Cosmo HXL group (0.312 ±0.020 mm and 1.446 ±0.134 mm³), Major Dent (0.261 ±0.034 mm and 1.219 ±0.196 mm³), Ivotion Dent (0.253 ±0.021 mm and 1.082 ±0.089 mm³), and NextDent C&B MFH (0.208 ±0.059 mm and 0.843 ±0.372 mm³). Based on the analysis of the SEM images, distinct groups of specimens exhibited varying degrees of crack formation. Furthermore, their worn surfaces showed diverse characteristics in terms of wear patterns and roughness attributes.</p><p><strong>Conclusions: </strong>The manufacturing methods for fabricating 3D printed, milled, and prefabricated denture teeth exhibit comparable wear resistance, with 3D printed denture teeth demonstrating the highest level of wear resistance.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142872402","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":"Digital trifunctional intraoral appliance for centric relation recording: A dental technique.","authors":"Chu-Chi Huang, Sang J Lee, German O Gallucci, Jason D Lee","doi":"10.1016/j.prosdent.2024.11.019","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.11.019","url":null,"abstract":"<p><p>A technique for fabricating a trifunctional intraoral appliance is described. This appliance streamlines the process of recording centric relation by combining the functions of an anterior deprogrammer, gothic arch tracer, and record base with occlusal rims into a single device. The use of digital tools in this technique offers greater convenience and efficiency compared with conventional methods.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142872399","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 different surface treatments on PEEK-enamel bonds: Bonding durability and mechanism.","authors":"Yuchen Liu, Shizhu Bai, Hengyan Liu, Kangjie Li, Sheng Zhong, Meng Li, Li Chen, Min Tian, Lina Niu, Ming Fang","doi":"10.1016/j.prosdent.2024.11.012","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.11.012","url":null,"abstract":"<p><strong>Statement of problem: </strong>Polyetheretherketone (PEEK) has been used in clinical dentistry because of its excellent physical and biological properties. However, achieving an effective and durable bond with enamel is challenging because of its chemical inertness and low surface energy, and data on the effects of different surface treatments on the durability of PEEK-enamel bonds are scarce.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to investigate airborne-particle abrasion, sulfuric acid etching, and the combined use of these treatments on the bonding durability of PEEK-enamel bonds and to gain a deeper understanding of their bonding mechanism.</p><p><strong>Material and methods: </strong>Sixty specimens were divided into 6 groups based on different surface treatments: untreated, sulfonation for 30 seconds, sulfonation for 60 seconds, airborne-particle abrasion, airborne-particle abrasion and sulfonation for 30 seconds, and sulfonation for 30 seconds and airborne-particle abrasion. Comprehensive evaluations were carried out on the surface morphology and physicochemical properties of the pretreated PEEK. After screening out the preferred surface treatment strategy of PEEK, the durability of PEEK-enamel bonds after thermal cycling (10 000 cycles at 5 to 55 °C) and the bonding mechanism were investigated by bond strength testing, cross-sectional topography, molecular dynamics,and Fourier transform infrared spectroscopy. Data were analyzed by 1-way analysis of variance, Weibull analysis, and the Fisher exact test (α=.05).</p><p><strong>Results: </strong>The shear bond strength of the 98% sulfuric acid etching group for either 30 seconds or 60 seconds was significantly higher than that of the other groups (P<.05). Intermolecular hydrogen bonding was found between PEEK and the methyl methacrylate- (MMA-) containing adhesive resin. Cross-sectional topography showed that the adhesive resin infiltrated into the pores of the sulfonated PEEK, thereby forming micromechanical locking at the bonded interface. The bond strength between the enamel and PEEK treated with 98% sulfuric acid for 60 seconds was found to be more reliable than that observed in the group treated with 98% sulfuric acid for 30 seconds after aging (P<.05).</p><p><strong>Conclusions: </strong>PEEK pretreated by 98% sulfuric acid etching for 60 seconds presented the best physicochemical properties. This was better than combined etching and airborne-particle abrasion or airborne-particle abrasion alone and showed durable PEEK-enamel bonds with the application of an MMA-containing adhesive.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142872400","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":"Trueness of maxillary complete dentures duplicated by using conventional and 3D printing techniques: A comparative in vitro study.","authors":"Amany Mostafa Saad Farahat, Omnia M Refai, Yasmine Said Elsherbeeny","doi":"10.1016/j.prosdent.2024.12.004","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.12.004","url":null,"abstract":"<p><strong>Statement of problem: </strong>Duplicating complete dentures and achieving accurately fitting prostheses poses a challenge. Conventional methods are often time-consuming and susceptible to human error. Advancements in digital technology for denture fabrication offer a promising alternative to conventional duplication techniques, but studies comparing the methods are lacking.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to compare the trueness of duplicated complete dentures using 3-dimensional (3D) printing technology with that of dentures duplicated using the conventional method.</p><p><strong>Material and methods: </strong>A typodont was used to construct a maxillary complete denture using the conventional method. The denture was scanned using a desktop scanner, and the standard tessellation language (STL) file was considered the reference file. Each denture was duplicated using 3 techniques (10 in each group). In the first group, the denture was duplicated using the conventional technique; in the second group, the denture was printed as a single unit (monolithic) from a tooth-colored resin, and the denture flange was then veneered with pink resin; in the third group, the denture base was printed separately from the pink resin, and the teeth were printed as a single unit using tooth-colored resin. The denture base and the teeth were co-related using a positioning device. The duplicate dentures in the 3 groups were scanned, and the STL files were imported into a surface-matching software program to evaluate their trueness. Statistical analysis was done using 1-way ANOVA followed by the Tukey post hoc test (α=.05).</p><p><strong>Results: </strong>A significant difference (P<.001) was found in the trueness of the 3 duplication techniques, with the highest overall deviation recorded in the conventional denture group (0.73 ±0.06 mm) and the least deviation recorded in the monolithic denture group (0.21 ±0.04 mm). Deviations in the canine, first molar, and maxillary tuberosities were the lowest in the monolithic denture group (0.13 ±0.01 mm), (0.11 ±0.03 mm), (0.27 ±0.05 mm), respectively.</p><p><strong>Conclusions: </strong>Using 3D printing technology for complete denture duplication has a promising outcome with the highest trueness reported with the monolithic denture. Comparative clinical studies are needed.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142864741","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":"Advancing 3D dental scanning: The use of photogrammetry with light detection and ranging for edentulous arches.","authors":"Mohammad Ali Saghiri, Ali Mohammad Saghiri, Elham Samadi, Julia Vakhnovetsky, Azam Kowalczyk, Maziar Farhadi, Omar Shahid, Amin Memariani, Steven M Morgano","doi":"10.1016/j.prosdent.2024.10.032","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.032","url":null,"abstract":"<p><strong>Statement of problem: </strong>The advent of computer-aided design and computer-aided manufacturing (CAD-CAM) has necessitated the acquisition of digital scans. However, there are limitations and problems with acquiring accurate 3-dimensional (3D) casts from edentulous patients, especially in the presence of saliva.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to develop a novel approach for obtaining 3D casts of edentulous arches by using 2-dimensional (2D) images as an alternative to traditional 3D scanners with and without light detection and ranging (LiDAR).</p><p><strong>Material and methods: </strong>This study comprised 6 groups, each consisting of 10 specimens. For the control group, 3D casts were generated by scanning edentulous mandibular molds using a dental laboratory scanner. Experimental groups included photogrammetry with and without LiDAR under various conditions (Groups PG360, PG120, LPG120, PG360S, LPG120S). For Groups PG120, LPG120, and LPG120S, a custom-made manikin was used. In all photogrammetry groups, images of each mold were captured with a mobile phone (iPhone 14 Pro Max). The casts from the experimental groups were superimposed onto those from the control group using the Blender Foundation software program (Version 3.6.1). The mean distances were calculated and statistically analyzed using 1-way ANOVA followed by the post hoc Tukey test (α=.05).</p><p><strong>Results: </strong>The mean distances between the experimental groups and the control group varied significantly. The PG360 and PG120 groups showed a statistically significant difference from the control group (P<.001, 95% CI), with mean distances of 1.54 ±0.31 mm and 4.54 ±1.65 mm, respectively. The LPG120S group, which combined photogrammetry with LiDAR in the presence of artificial saliva, achieved a mean distance of 2.03 ±0.46 mm, which was not significantly different from the control group (P=.501, 95% CI).</p><p><strong>Conclusions: </strong>The successful scanning of edentulous mandibular molds using a mobile phone was achieved through a combination of 2D images and LiDAR, covering a limited access angle of 120 degrees. Compared with other techniques, the method developed the most accurate 3D casts and was less susceptible to interference from saliva, a significant issue for intraoral scanners.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142854532","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 HbA1c levels on the clinical outcomes of ultrahydrophilic, smooth collar implants in patients with type 2 diabetes mellitus.","authors":"Yuxin Bai, Shuyan Wang, Jian Zheng, Shuang Song, Guanhua Zhang, Kai Jiao, Yingliang Song, Sijia Zhang","doi":"10.1016/j.prosdent.2024.10.034","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.034","url":null,"abstract":"<p><strong>Statement of problem: </strong>The relationship between hemoglobin A1c (HbA1c) levels and the clinical outcomes of ultrahydrophilic, smooth collar implants in the maxillary molar region remains underexplored.</p><p><strong>Purpose: </strong>The purpose of this clinical study was to investigate the relationship between the HbA1c levels and clinical outcomes of ultrahydrophilic, smooth collar implants in the maxillary molar region of patients with type 2 diabetes mellitus.</p><p><strong>Material and methods: </strong>In total, 35 participants with type 2 diabetes mellitus who had received dental implants in the maxillary molar region between January 2016 and June 2020 were enrolled. Marginal bone levels (MBLs) were assessed from radiographs immediately and 1 to 2 years after restoration. Peri-implant tissue health was evaluated clinically and radiographically, and patient satisfaction was measured using the Oral Health Impact Profile-14 scale. The data were organized using a spreadsheet and statistically analyzed with a statistical software package. A t test was used to determine significant differences between groups, specifically comparing patients with HbA1c levels <7% and ≥7% in terms of MBLs, bleeding on probing (BOP), probing depth (PD), and patient satisfaction (OHIP-14 scores) (α=.05). Furthermore, a linear correlation analysis was performed to assess the relationship between HbA1c levels and PD, as well as HbA1c levels and OHIP-14 scores.</p><p><strong>Results: </strong>Of the 35 participants, 27 were successfully followed up, and 27 ultrahydrophilic, smooth collar implants with a mean ±standard deviation length of 9.30 ±1.16 mm were placed. All implants were considered clinically successful 1 to 2 years after restoration. Those with HbA1c levels <7% exhibited no mesial or distal bone loss, while those with HbA1c levels ≥7% experienced a mean ±standard deviation distal marginal bone loss of 0.25 ±0.30 mm and a mean ±standard deviation mesial marginal bone loss of 0.14 ±0.16 mm. The overall satisfaction and total Oral Health Impact Profile-14 scores in patients with HbA1c levels ≥7.5% significantly differed from those with HbA1c levels <7.5% (P<.05).</p><p><strong>Conclusions: </strong>Ultrahydrophilic, smooth collar implants demonstrated favorable clinical and patient satisfaction outcomes in patients with type 2 diabetes mellitus, with HbA1c levels serving as strong indicators of peri-implant health.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142824329","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":"Retrieval of fractured implant screw: A dental technique.","authors":"Sara Alzamel, Stephen F Rosenstiel, Mathew T Kattadiyil","doi":"10.1016/j.prosdent.2024.11.008","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.11.008","url":null,"abstract":"<p><p>Removing a fractured implant screw, though a relatively rare occurrence, presents a significant challenge for clinicians. Protecting the internal surface of the implant from damage during the retrieval of the fractured fragment is critical to avoid additional complications. A novel, cost-effective, and conservative technique for retrieving fractured implant screws using a small-diameter dental prophylactic brush is described.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142824281","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":"Fracture resistance, 3-dimensional finite element analysis, and safety factors for five post-and-core restorations with crowns placed in the noncircular-shaped canals of premolars.","authors":"Top Chitkraisorn, Kunyawan Thaungwilai, Boonsong Prateepsawangwong, Pairod Singhatanadgid, Terawat Tosiriwatanapong","doi":"10.1016/j.prosdent.2024.11.001","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.11.001","url":null,"abstract":"<p><strong>Statement of problem: </strong>Restoring endodontically treated premolars with noncircular canals presents a significant challenge.</p><p><strong>Purpose: </strong>The purpose of this study was to compare the in vitro fracture resistance and the finite element computational calculation-based stress and safety factor of noncircular-shaped, endodontically treated premolars restored with 5 different prefabricated and custom computer-aided design and computer-aided manufactured post-and-core systems.</p><p><strong>Material and methods: </strong>Fifty single-rooted oval-shaped canal maxillary premolars were endodontically treated and post spaces were prepared. The specimens were divided into 5 categories on the basis of the post-and-core system used: Group CN composite resin core without a post, Group CF prefabricated fiber-reinforced composite resin post and composite resin core, Group IC interpenetrating phase composite post-and-core, Group LS lithium disilicate post-and-core, and Group ZR zirconia post-and-core. Lithium disilicate crowns were fabricated and cemented on the 5 different post-and-core systems and subjected to a fracture resistance test using a spherical indenter with static loading. Differences in fracture resistance were evaluated using a 1-way analysis of variance (ANOVA) (α=.05). The 3-dimensional finite element method was used to determine the von Mises stress and safety factors, defined as the ratio of the material's strength to the von Mises stress experienced, within different compartments of the restored tooth model.</p><p><strong>Results: </strong>In the in vitro fracture resistance test, the mean ±standard deviation fracture loads of the 5 groups were 2144 ±515 N, 1801 ±600 N, 1690 ±312 N, 1612 ±545 N, and 1487 ±600 N, respectively and were statistically similar (P=.078). All specimens within the ZR group exhibited restorable fractures. In contrast, only 30% of the CN group specimens showed restorable fractures. The incidence of restorable fractures in the CF, IC, and LS groups was 70%, 80%, and 70%, respectively. Although all groups showed similar maximum von Mises stress and stress distribution, safety factors in the models varied significantly. The ceramic crown was the weakest component in the LS and ZR groups, with much lower safety factors than dentin and post-and-core regions. Additionally, the CN group's wider dentin area had a demonstrably lower safety factor.</p><p><strong>Conclusions: </strong>Endodontically treated noncircular-shaped canal premolars showed minimal effect on fracture resistance regardless of post type. However, for teeth with sufficient ferrule, using any post-and-core system significantly reduced the incidence of nonrestorable fractures compared with just a coronal foundation restoration, with custom zirconia offering the potential of achieving a restorable outcome after fracture.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791951","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 chairside polishing systems on the surface roughness of different CAD-CAM denture base materials.","authors":"Nareudee Limpuangthip, Sarita Apiromwijit, Prarom Salimee","doi":"10.1016/j.prosdent.2024.11.011","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.11.011","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Statement of problem: &lt;/strong&gt;Adjusting and polishing a denture base affects surface roughness and, consequently, microbial adhesion. Since various computer-aided design and computer-aided manufacturing (CAD-CAM) denture base materials are available, the efficiency of chairside polishing systems to achieve a proper surface roughness should be investigated.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Purpose: &lt;/strong&gt;The purpose of this in vitro study was to compare the surface roughness of milled and 3-dimensional (3D) printed denture base materials with that of heat-polymerized acrylic resin after the use of 2 different chairside polishing systems.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Material and methods: &lt;/strong&gt;Heat-polymerized (control), milled, and 3D printed denture base materials were tested. Laboratory polished and unpolished denture bases served as positive and negative controls. Specimens were divided into 2 chairside silicone polishing systems (AcryPoint system and Exa technique). Surface roughness was measured before and after polishing. Surface morphology of the unpolished and polished specimens was observed via scanning electron microscopy. The surface hardness of unpolished specimens was measured using a Vickers hardness tester. Stress-strain behavior of the silicone matrix and abrasive filler size of each polisher was assessed. The effects of denture base materials and polishing systems on surface roughness and hardness were evaluated using 1-way, 2-way, and repeated measures analyses of variance (ANOVA) (α=.05), along with Weibull proportional hazards regression to assess the likelihood of achieving clinically acceptable surface roughness. The Spearman correlation assessed the relationship between the hardness of unpolished denture bases and final surface roughness.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;The surface roughness of all denture bases decreased with increased polishing duration, reaching a plateau after 60 seconds. For the heat-polymerized and milled dentures, the Exa technique consistently yielded lower roughness than the AcryPoint system (P&lt;.001). Conversely, both polishing systems produced comparable surface roughness on the 3D printed denture base. The Vickers hardness of the unpolished milled denture was significantly higher than of the others (P=.010). The stress-strain behavior of the polisher matrix revealed distinct characteristics between coarse or medium and fine polishers within each polishing system. The abrasive filler size of the AcryPoint coarse polisher was relatively larger than that of the Exa technique.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Conclusions: &lt;/strong&gt;Regardless of polishing protocols, the 3D printed denture base exhibited the highest surface roughness, followed by heat-polymerized and milled denture bases. The surface roughness of the polished denture was not related with the material hardness. For heat-polymerized and milled dentures, a chairside silicone polishing system can be used to attain a level of surface roughness similar to that of laboratory p","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791947","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":"Cone beam computed tomography outcomes in patients diagnosed with compromised bone health undergoing dental implant therapy and bone augmentation.","authors":"Caroline Wilson, Pamela Taxel, David Shafer, Aditya Tadinada, Lucas da Cunha Godoy, Chia-Ling Kuo, Martin Freilich","doi":"10.1016/j.prosdent.2024.10.030","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.030","url":null,"abstract":"<p><strong>Statement of problem: </strong>Studies examining mid-term treatment outcomes of implant placement with bone augmentation in patients with compromised bone health are lacking.</p><p><strong>Purpose: </strong>The purpose of this prospective, nonrandomized cohort study was to evaluate the cone bean computed tomography (CBCT) outcomes of implant placement with bone augmentation in postmenopausal women.</p><p><strong>Material and methods: </strong>For this best practice, standard of care study, 78 participants received 1 test implant along with 1 or a combination of 3 bone augmentation procedures: particulate graft, expansion, or block graft. Participants were categorized as healthy (n=49) or bone compromised (n=29). Using CBCT scans made preoperatively, immediately postoperatively, and 2 years postoperatively, the augmented alveolar ridge widths were measured in a buccolingual (BL) dimension 2 mm and 6 mm apical to the coronal aspect of the implant's rough surface. Additionally, peri-implant bone height was measured on the mesial and distal implant surfaces at the mid-alveolar aspect of the ridge using a coronal panoramic view.</p><p><strong>Results: </strong>Both study groups exhibited an increase in horizontal BL measurements at the 2-mm and 6-mm landmarks from preoperative to immediate postoperative time points and a minimal decrease from intermediate postoperative to 2 years postoperative. The mean proximal height decreased over time in healthy participants but did not show a significant change in participants with compromised bone. The linear mixed effects model results revealed that the mean difference between groups significantly decreased over time at the 2-mm landmark (P<.05); however, no significant group-time interactions were found for the BL width at the 6-mm landmark and proximal height measurements (P=.627).</p><p><strong>Conclusions: </strong>Mid-term CBCT measurements showed significant bone augmentation immediately after surgery and 2 years after surgery and stable proximal bone adjacent to implants in postmenopausal women diagnosed with compromised bone health.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791798","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}