Journal of Advanced Prosthodontics最新文献

{"title":"The effects of cement thickness and cement shade on the final color of lithium disilicate crowns.","authors":"Yiğit Yamalı,&nbsp;Merve Bankoğlu Güngör,&nbsp;Seçil Karakoca Nemli,&nbsp;Bilge Turhan Bal","doi":"10.4047/jap.2023.15.2.93","DOIUrl":"https://doi.org/10.4047/jap.2023.15.2.93","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study is to evaluate the effect of resin cement color, cement thickness, and thermocycling on the final color of monolithic lithium disilicate crowns.</p><p><strong>Materials and methods: </strong>A total of ninety prepared central incisors of typodont teeth were restored with lithium disilicate crowns which have different cement thicknesses (40 µm, 80 µm, and 120 µm) and cement shades (clear, yellow, and white). Color parameters of restorations were measured with a spectrophotometer in three different steps 1) before cementing 2) after cementing and 3) after thermocycling with 10000 cycles. Color differences (ΔE₀₀) were calculated with the CIEDE2000 formula and evaluated according to perceptibility (0.8) and acceptability (1.8) thresholds. The ΔE₀₀ data were analyzed by using two-way ANOVA before and after thermocycling (α = .05).</p><p><strong>Results: </strong>There was no interaction between the cement shade and the cement thickness factors. After cementation, the mean ΔE₀₀ was under the perceptibility threshold in the group of 40 µm cement thickness and clear cement while it was between the perceptibility and acceptability thresholds (0.8 < ΔE₀₀ < 1.8) for all other groups. After thermocycling, the ΔE₀₀ values were between the perceptibility and acceptability thresholds for all experimental groups. Although there were no significant differences among the groups, thermocycling increased the color difference values.</p><p><strong>Conclusion: </strong>The cementation of restorations with clear, yellow, and white resin cements resulted in color differences with uncemented restorations except for the group cemented with clear cement in 40 µm cement thickness. All study groups revealed perceptible color change after thermocycling.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 2","pages":"93-100"},"PeriodicalIF":2.6,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/0b/2c/jap-15-93.PMC10154146.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9436500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of hemispherical dimples at titanium implant abutments for the retention of cemented crowns.","authors":"Jung-Hoon Choi,&nbsp;Seong-Joo Heo,&nbsp;Jai-Young Koak,&nbsp;Seong-Kyun Kim,&nbsp;Ji-Man Park,&nbsp;Jin-Soo Ahn","doi":"10.4047/jap.2023.15.2.63","DOIUrl":"https://doi.org/10.4047/jap.2023.15.2.63","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study was to assess the effect of hemispherical dimple structures on the retention of cobalt-chromium (Co-Cr) crowns cemented to titanium abutments, with different heights and numbers of dimples on the axial walls.</p><p><strong>Materials and methods: </strong>3.0-mm and 6.0-mm abutments (N = 180) and Co-Cr crowns were prepared. The experimental groups were divided into two and four dimple groups. The crowns were cemented by TempBond and PANAVIA F 2.0 cements. The retention forces were measured after thermal treatments. A two-way Analysis of Variance (ANOVA) and post-hoc Tukey HSD test were conducted to analyze change in retention forces by use of dimples between groups, as well as <i>t</i> test for the effect of abutment height change (α = .05).</p><p><strong>Results: </strong>Results of the two-way ANOVA showed a statistically significant difference in retention force due to the use of dimples, regardless of the types of cements used (<i>P</i> < .001). A significantly higher mean retention forces were observed in the groups with dimples than in the control group, using the post hoc Tukey HSD test (<i>P</i> < .001). Results of <i>t</i> test displayed a statistically significant increase in the retention force with 6.0-mm abutments compared with 3.0-mm abutments (<i>P</i> < .001). The groups without dimples revealed adhesive failure of cements, while the groups with dimples showed mixed failure of cements.</p><p><strong>Conclusion: </strong>Use of hemispherical dimples was effective for increasing retention forces of cemented crowns.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 2","pages":"63-71"},"PeriodicalIF":2.6,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/f7/4d/jap-15-63.PMC10154144.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9432568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The comparison of the accuracy of temporary crowns fabricated with several 3D printers and a milling machine.","authors":"Junsik Lee,&nbsp;Sungwon Ju,&nbsp;Jihyung Kim,&nbsp;Sion Hwang,&nbsp;Jinsoo Ahn","doi":"10.4047/jap.2023.15.2.72","DOIUrl":"https://doi.org/10.4047/jap.2023.15.2.72","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this <i>in vitro</i> study was to compare the accuracy of various 3D printers and a milling machine.</p><p><strong>Materials and methods: </strong>The die model was designed using CAD (Autodesk Inventor 2018 sp3). The 30 µm cement space was given to the die and the ideal crown of the mandibular left first molar was designed using CAD (ExoCAD). The crowns were produced using the milling machine (Imes-icore 250i) and the 3D printers (Zenith U, Zenith D, W11) and they were divided into four groups. In all groups, the interior of each crown was scanned (Identica blue) and superimposed (Geomagic Control X) with the previously designed die. The difference between the die and the actual crown was measured at specific points. The Kruskal-Wallis test, the Mann-Whitney test, and Bonferroni's method were performed with a statistical analysis software (<i>P</i> < .008 in inter-group comparison <i>P</i> < .001 in intra-group comparison).</p><p><strong>Results: </strong>In all groups, the center of the occlusal area and the anti-rotational dimple area showed significantly greater difference and the marginal area showed the smallest difference comparatively. The mean value of the difference in each area and the sum of the differences were higher in order of W11, Imes-icore 250i, Zenith D, and Zenith U.</p><p><strong>Conclusion: </strong>The digital light processing (DLP) method shows higher accuracy compared to the sereolithography (SLA) method using the same resin material.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 2","pages":"72-79"},"PeriodicalIF":2.6,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/10/3b/jap-15-72.PMC10154143.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9432569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of trueness and precision of removable partial denture metal frameworks manufactured with digital technology and different materials.","authors":"Leonardo Ciocca,&nbsp;Mattia Maltauro,&nbsp;Elena Pierantozzi,&nbsp;Lorenzo Breschi,&nbsp;Angela Montanari,&nbsp;Laura Anderlucci,&nbsp;Roberto Meneghello","doi":"10.4047/jap.2023.15.2.55","DOIUrl":"https://doi.org/10.4047/jap.2023.15.2.55","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study is to evaluate the accuracy of removable partial denture (RPD) frameworks produced using different digital protocols.</p><p><strong>Materials and methods: </strong>80 frameworks for RPDs were produced using CAD-CAM technology and divided into four groups of twenty (n = 20): Group 1, Titanium frameworks manufactured by digital metal laser sintering (DMLS); Group 2, Co-Cr frameworks manufactured by DMLS; Group 3, Polyamide PA12 castable resin manufactured by multi-jet fusion (MJF); and Group 4, Metal (Co-Cr) casting by using lost-wax technique. After the digital acquisition, eight specific areas were selected in order to measure the Δ-error value at the intaglio surface of RPD. The minimum value required for point sampling density (0.4 mm) was derived from the sensitivity analysis. The obtained Δ-error mean value was used for comparisons: 1. between different manufacturing processes; 2. between different manufacturing techniques in the same area of interest (AOI); and 3. between different AOI of the same group.</p><p><strong>Results: </strong>The Δ-error mean value of each group ranged between -0.002 (Ti) and 0.041 (Co-Cr) mm. The Pearson's Chi-squared test revealed significant differences considering all groups paired two by two, except for group 3 and 4. The multiple comparison test documented a significant difference for each AOI among group 1, 3, and 4. The multiple comparison test showed significant differences among almost all different AOIs of each group.</p><p><strong>Conclusion: </strong>All Δ-mean error values of all digital protocols for manufacturing RPD frameworks optimally fit within the clinical tolerance limit of trueness and precision.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 2","pages":"55-62"},"PeriodicalIF":2.6,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/e7/6b/jap-15-55.PMC10154145.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9432570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional morphometric analysis of facial units in virtual smiling facial images with different smile expressions.","authors":"Hang-Nga Mai,&nbsp;Thaw Thaw Win,&nbsp;Minh Son Tong,&nbsp;Cheong-Hee Lee,&nbsp;Kyu-Bok Lee,&nbsp;So-Yeun Kim,&nbsp;Hyun-Woo Lee,&nbsp;Du-Hyeong Lee","doi":"10.4047/jap.2023.15.1.1","DOIUrl":"https://doi.org/10.4047/jap.2023.15.1.1","url":null,"abstract":"<p><strong>Purpose: </strong>Accuracy of image matching between resting and smiling facial models is affected by the stability of the reference surfaces. This study aimed to investigate the morphometric variations in subdivided facial units during resting, posed and spontaneous smiling.</p><p><strong>Materials and methods: </strong>The posed and spontaneous smiling faces of 33 adults were digitized and registered to the resting faces. The morphological changes of subdivided facial units at the forehead (upper and lower central, upper and lower lateral, and temple), nasal (dorsum, tip, lateral wall, and alar lobules), and chin (central and lateral) regions were assessed by measuring the 3D mesh deviations between the smiling and resting facial models. The one-way analysis of variance, Duncan post hoc tests, and Student's t-test were used to determine the differences among the groups (α = .05).</p><p><strong>Results: </strong>The smallest morphometric changes were observed at the upper and central forehead and nasal dorsum; meanwhile, the largest deviation was found at the nasal alar lobules in both the posed and spontaneous smiles (<i>P</i> < .001). The spontaneous smile generally resulted in larger facial unit changes than the posed smile, and significant difference was observed at the alar lobules, central chin, and lateral chin units (<i>P</i> < .001).</p><p><strong>Conclusion: </strong>The upper and central forehead and nasal dorsum are reliable areas for image matching between resting and smiling 3D facial images. The central chin area can be considered an additional reference area for posed smiles; however, special cautions should be taken when selecting this area as references for spontaneous smiles.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 1","pages":"1-10"},"PeriodicalIF":2.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/4a/73/jap-15-1.PMC9992697.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9095524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the trueness and precision of complete denture bases manufactured using digital and analog technologies.","authors":"Leonardo Ciocca,&nbsp;Mattia Maltauro,&nbsp;Valerio Cimini,&nbsp;Lorenzo Breschi,&nbsp;Angela Montanari,&nbsp;Laura Anderlucci,&nbsp;Roberto Meneghello","doi":"10.4047/jap.2023.15.1.22","DOIUrl":"https://doi.org/10.4047/jap.2023.15.1.22","url":null,"abstract":"<p><strong>Purpose: </strong>Digital technology has enabled improvements in the fitting accuracy of denture bases via milling techniques. The aim of this study was to evaluate the trueness and precision of digital and analog techniques for manufacturing complete dentures (CDs).</p><p><strong>Materials and methods: </strong>Sixty identical CDs were manufactured using different production protocols. Digital and analog technologies were compared using the reference geometric approach, and the Δ-error values of eight areas of interest (AOI) were calculated. For each AOI, a precise number of measurement points was selected according to sensitivity analyses to compare the Δ-error of trueness and precision between the original model and manufactured prosthesis. Three types of statistical analysis were performed: to calculate the intergroup cumulative difference among the three protocols, the intergroup among the AOIs, and the intragroup difference among AOIs.</p><p><strong>Results: </strong>There was a statistically significant difference between the dentures made using the oversize process and injection molding process (<i>P</i> < .001), but no significant difference between the other two manufacturing methods (<i>P</i> = .1227). There was also a statistically significant difference between the dentures made using the monolithic process and the other two processes for all AOIs (<i>P</i> = .0061), but there was no significant difference between the other two processes (<i>P</i> = 1). Within each group, significant differences among the AOIs were observed.</p><p><strong>Conclusion: </strong>The monolithic process yielded better results, in terms of accuracy (trueness and precision), than the other groups, although all three processes led to dentures with Δ-error values well within the clinical tolerance limit.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 1","pages":"22-32"},"PeriodicalIF":2.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/df/38/jap-15-22.PMC9992699.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9095530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Six-year clinical performance of lithium disilicate glass-ceramic CAD-CAM versus metal-ceramic crowns.","authors":"Ahmed Aziz,&nbsp;Omar El-Mowafy","doi":"10.4047/jap.2023.15.1.44","DOIUrl":"https://doi.org/10.4047/jap.2023.15.1.44","url":null,"abstract":"<p><strong>Purpose: </strong>To assess the clinical performance of monolithic CAD-CAM lithium disilicate glass-ceramic (LDGC) crowns and metal-ceramic (MC) crowns provided by predoctoral students. This study also assessed the effects of patient and provider-related factors on their clinical performance as well as patient preference for these types of crowns.</p><p><strong>Materials and methods: </strong>Twenty-five patients who received 50 crowns (25 LDGC CAD-CAM and 25 MC) provided by predoctoral students were retrospectively examined. LDGC CAD-CAM crowns were milled in-house using the CEREC Bluecam system and cemented with either RelyX Unicem or Calibra Esthetic resin cements. MC crowns were cemented with RelyX Unicem cement. Clinical assessment of the crowns and the supporting periodontal structures were performed following the modified California Dental Association (CDA) criteria. Patients' preference was recorded using a visual analog scale (VAS). The results were statistically analyzed using log-rank test, Pearson Chi-squared test and Kaplan-Meier survival analysis.</p><p><strong>Results: </strong>Twelve complications were observed in the MC crown group (9-esthetic, 2-technical and 1-biological). In comparison, 2 complications in the LDGC CAD-CAM crown group were observed (1-technical and 1-esthetic). The 6-year cumulative survival rates for MC crowns and LDGC CAD-CAM were 90.8% and 96%, respectively, whereas the success rates were 83.4% and 96%, respectively. Overall, patients preferred the esthetic outcomes of LDGC CAD-CAM crowns over MC crowns.</p><p><strong>Conclusion: </strong>The high survival and success rates, low number of complications, and the high level of patients' acceptance of monolithic LDGC CAD-CAM crowns lend them well as predictable and viable alternatives to the \"gold standard\" MC crowns.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 1","pages":"44-54"},"PeriodicalIF":2.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/53/4f/jap-15-44.PMC9992700.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9095527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative study to measure the sagittal condylar inclination using mechanical articulator, virtual articulator and jaw tracking device.","authors":"Liya Ma,&nbsp;Fei Liu,&nbsp;Jiansong Mei,&nbsp;Jiarui Chao,&nbsp;Zhenyu Wang,&nbsp;Jiefei Shen","doi":"10.4047/jap.2023.15.1.11","DOIUrl":"https://doi.org/10.4047/jap.2023.15.1.11","url":null,"abstract":"<p><strong>Purpose: </strong>To compare the sagittal condylar inclination (SCI) in dentate individuals measured by the different methods with mechanical articulator (MA), virtual articulator (VA), and a jaw tracking device (JTD) system.</p><p><strong>Materials and methods: </strong>A total of 22 healthy dentate participants were enrolled in this study. For MA workflow, the SCI was obtained by a semi-adjustable articulator with protrusive interocclusal records. The SCI was also set on a VA by aligning intraoral scan (IOS) with cone beam computed tomography (CBCT) and facial scan (FS), respectively. These virtual workflows were conducted in a dental design software, namely VA_IOS-CBCT and VA_IOS-FS. Meanwhile, a JTD system was also utilized to perform the measurement. Intraclass correlation was used to assess the repeatability within workflows. The bilateral SCI values were compared by Wilcoxon matched-pairs signed rank test for each workflow, and Kruskal-Wallis test and post hoc p-value Bonferroni correction were used to compare the differences among four workflows. The agreement of VA_IOS-CBCT, VA_IOS-FS, and JTD compared with MA was evaluated by Bland-Altman analysis.</p><p><strong>Results: </strong>Intraclass correlation of the SCI revealed a high degree of repeatability for each workflow. There were no significant differences between the left and right sides (<i>P</i> > .05), except for VA_IOS-CBCT (<i>P</i> = .028). Significant differences were not found between MA and VA_IOS-FS (<i>P</i> > .05). Bland-Altman plots indicated VA_IOS-CBCT, VA_IOS-FS, and JTD were considered to substitute MA with high 95% limits of agreement.</p><p><strong>Conclusion: </strong>The workflow of VA_IOS-FS provided an alternative approach to measure the SCI compared with MA.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 1","pages":"11-21"},"PeriodicalIF":2.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/27/3d/jap-15-11.PMC9992698.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9095523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical and mechanical changes on titanium base of three different types of hybrid abutment after cyclic loading.","authors":"Rimantas Ožiūnas,&nbsp;Jurgina Sakalauskienė,&nbsp;Laurynas Staišiūnas,&nbsp;Gediminas Žekonis,&nbsp;Juozas Žilinskas,&nbsp;Gintaras Janužis","doi":"10.4047/jap.2023.15.1.33","DOIUrl":"https://doi.org/10.4047/jap.2023.15.1.33","url":null,"abstract":"<p><strong>Purpose: </strong>This study investigated the physical and mechanical changes in the titanium base of three different hybrid abutment materials after cyclic loading by estimating the post-load reverse torque value (RTV), compressive side fulcrum wear pattern of titanium base, and surface roughness.</p><p><strong>Materials and methods: </strong>A total of 24 dental implants were divided into three groups (n = 8 each): Group Z, LD, and P used zirconia, lithium disilicate, and polyetheretherketone, respectively, for hybrid abutment fabrication. RTV was evaluated after cyclic loading with 50 N for 1.2 × 10⁶ chewing cycles. The compressive sides of the titanium bases were analyzed using a scanning electron microscope, and the roughness of the affected areas was measured using an optical profilometer after loading. Datasets were analyzed using Kruskal-Wallis test followed by Mann-Whitney tests with the Bonferroni correction (α = .05).</p><p><strong>Results: </strong>Twenty-three samples passed the test; one LD sample fractured after 770,474 cycles. Post-load RTV varied significantly depending on the hybrid-abutment material (<i>P</i> = .020). Group P had a significantly higher median of post-load RTVs than group Z (16.5 and 14.3 Ncm, respectively). Groups LD and P showed minor signs of wear, and group Z showed a more pronounced wear pattern. While evaluating compressive side affected area roughness of titanium bases, lower medians were shown in group LD (Ra 0.16 and Rq 0.22 µm) and group P (Ra 0.16 and Rq 0.23 µm) than in group Z (Ra 0.26 and Rq 0.34 µm); significant differences were found only among the unaffected surface and group Z.</p><p><strong>Conclusion: </strong>The hybrid abutment material influences the post-load RTV. Group Z had a more pronounced wear pattern on the compressive side of titanium base; however, the surface roughness was not statistically different among the hybrid-abutment groups.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"15 1","pages":"33-43"},"PeriodicalIF":2.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/f3/8d/jap-15-33.PMC9992696.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9095528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the accuracy of dental casts manufactured with 3D printing technique in the All-on-4 treatment concept.","authors":"Hilin Tas,&nbsp;Fatih Demirci,&nbsp;Mesut Tuzlali,&nbsp;Erkan Bahce,&nbsp;Guler Yildirim Avcu","doi":"10.4047/jap.2022.14.6.379","DOIUrl":"https://doi.org/10.4047/jap.2022.14.6.379","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study is to compare the casts obtained by using conventional techniques and liquid crystal display (LCD) three-dimensional (3D) print techniques in the All-on-4 treatment concept of the edentulous mandibular jaw.</p><p><strong>Materials and methods: </strong>In this study, a completely edentulous mandibular acrylic cast (typodont) with bone-level implants placed with the All-on-4 technique served as a reference cast. In this typodont, impressions were taken with the conventional technique and dental stone casts were obtained. In addition, after scanning the acrylic cast in a dental laboratory scanner and obtaining the Standard Tessellation Language (STL) data, 3D printed casts were manufactured with a 3D printing device based on the design. The stone and 3D printed casts were scanned in the laboratory scanner and STL data were obtained, and then the interimplant distances were measured using Geomagic Control X v2020 (3D Systems, Rock Hill, SC, USA) analysis software (n = 60). The obtained data were statistically evaluated with one-way analysis of variance (ANOVA) and Tukey's pairwise comparison tests.</p><p><strong>Results: </strong>As a result of the one-way ANOVA test, it was determined that the stone casts, 3D printed casts, and reference cast values in all distance intervals conformed to the normal distribution and these values had a significant difference among them in all distance intervals. In Tukey pairwise comparison test, significant differences were found between casts at all distance intervals. In all analyses, the level of significance was determined as .05.</p><p><strong>Conclusion: </strong>3D printed casts obtained with a 3D LCD printing device can be an alternative to stone casts when implants are placed in edentulous jaws.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 6","pages":"379-387"},"PeriodicalIF":2.6,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/25/86/jap-14-379.PMC9832145.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10572836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}