Journal of Advanced Prosthodontics最新文献

{"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}

{"title":"Three-dimensional analysis of the outcome of different scanning strategies in virtual interocclusal registration.","authors":"Jiansong Mei,&nbsp;Liya Ma,&nbsp;Jiarui Chao,&nbsp;Fei Liu,&nbsp;Jiefei Shen","doi":"10.4047/jap.2022.14.6.369","DOIUrl":"https://doi.org/10.4047/jap.2022.14.6.369","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this <i>in vitro</i> study was to assess whether scanning strategies of virtual interocclusal record (VIR) affect the accuracy of VIR during intraoral scanning.</p><p><strong>Materials and methods: </strong>Five pairs of reference cubes were added to the digital upper and lower dentitions of a volunteer, which were printed into resin casts. Subsequently, the resin casts were articulated in the maximal intercuspal position in a mechanical articulator and scanned with an industrial computed tomography system, of which the VIR was served as a reference VIR. The investigated VIR of the upper and lower jaws of the resin master cast were recorded with an intraoral scanner according to 9 designed scanning strategies. Then, the deviation between the investigated VIRs and reference VIR were analyzed, which were measured by the deviation of the distances of six selected reference points on the upper reference cubes in each digital cast to the XY-plane between the investigated VIRs and reference VIR.</p><p><strong>Results: </strong>For the deviation in the right posterior dentitions, RP group (only scanning of right posterior dentitions) showed the smallest deviation. Besides, BP group (scanning of bilateral posterior dentitions) showed the smallest deviation in the left posterior dentitions. Moreover, LP group (scanning of left posterior dentitions) showed the smallest deviation in the anterior dentitions. For the deviation of full dental arches, BP group showed the smallest deviation.</p><p><strong>Conclusion: </strong>Different scanning strategies of VIR can influence the accuracy of alignment of virtual dental casts. Appropriate scanning strategies of VIR should be selected for different regions of interest and edentulous situations.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 6","pages":"369-378"},"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/7d/d9/jap-14-369.PMC9832144.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10572830","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":"Biomechanical investigation of maxillary implant-supported full-arch prostheses produced with different framework materials: a finite elements study.","authors":"Mirac Berke Topcu Ersöz,&nbsp;Emre Mumcu","doi":"10.4047/jap.2022.14.6.346","DOIUrl":"https://doi.org/10.4047/jap.2022.14.6.346","url":null,"abstract":"<p><strong>Purpose: </strong>Four and six implant-supported fixed full-arch prostheses with various framework materials were assessed under different loading conditions.</p><p><strong>Materials and methods: </strong>In the edentulous maxilla, the implants were positioned in a configuration of four to six implant modalities. CoCr, Ti, ZrO₂, and PEEK materials were used to produce the prosthetic structure. Using finite element stress analysis, the first molar was subjected to a 200 N axial and 45° oblique force. Stresses were measured on the bone, implants, abutment screw, abutment, and prosthetic screw. The Von Mises, maximum, and minimum principal stress values were calculated and compared.</p><p><strong>Results: </strong>The maximum and minimum principal stresses in bone were determined as CoCr < ZrO₂ < Ti < PEEK. The Von Mises stresses on the implant, implant screw, abutment, and prosthetic screws were determined as CoCr < ZrO₂ < Ti < PEEK. The highest Von Mises stress was 9584.4 Mpa in PEEK material on the prosthetic screw under 4 implant-oblique loading. The highest maximum principal stress value in bone was found to be 120.89 Mpa, for PEEK in 4 implant-oblique loading.</p><p><strong>Conclusion: </strong>For four and six implant-supported structures, and depending on the loading condition, the system accumulated different stresses. The distribution of stress was reduced in materials with a high elastic modulus. When choosing materials for implant-supported fixed prostheses, it is essential to consider both the number of implants and the mechanical and physical attributes of the framework material.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 6","pages":"346-359"},"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/5b/de/jap-14-346.PMC9832146.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10572834","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 surface characteristics of (Y, Nb)-TZP after finishing and polishing.","authors":"Seong-Keun Yoo,&nbsp;Ye-Hyeon Jo,&nbsp;In-Sung Luke Yeo,&nbsp;Hyung-In Yoon,&nbsp;Jae-Hyun Lee,&nbsp;Jin-Soo Ahn,&nbsp;Jung-Suk Han","doi":"10.4047/jap.2022.14.6.335","DOIUrl":"https://doi.org/10.4047/jap.2022.14.6.335","url":null,"abstract":"<p><strong>Purpose: </strong>This <i>in vitro</i> study aimed to evaluate the surface characteristics of a full veneer crown fabricated chairside (CS) from a (Y, Nb)-TZP zirconia block in response to conventional zirconia grinding and polishing.</p><p><strong>Materials and methods: </strong>Zirconia crowns (n = 40) were first prepared and divided into two groups of materials: Labside (LS) and CS, after which each specimen went through a five-step grinding and polishing procedure. Following each surface treatment, surface characteristics were analyzed using confocal laser microscopy (CLSM), average surface roughness (Ra) values were processed from the profile data through Gaussian filtering, and X-ray diffraction pattern analysis was performed to evaluate the monoclinic (M) phase content. Then, a representative specimen was selected for field-emission scanning electron microscopy (FE-SEM), followed by a final analysis of the roughness and X-ray diffraction of the specimens using the independent t-test and repeated measures analysis of variance (RM-ANOVA).</p><p><strong>Results: </strong>In every group, polishing significantly reduced the Ra values (<i>P</i> < .001). There was no significant difference in Ra between the polished state CS and LS. Furthermore, CLSM and FE-SEM investigations revealed that even though grain exposure was visible in CS specimens throughout the as-delivered and ground states, the exposure was reduced after polishing. Moreover, while no phase transformation was visible in the LS, phase transformation was visible in CS after every surface treatment, with the M phase content of the CS group showing a significant reduction after polishing (<i>P</i> < .001).</p><p><strong>Conclusion: </strong>Within the limits of this study, clinically acceptable level of surface finishing of (Y, Nb)-TZP can be achieved after conventional zirconia polishing sequence.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 6","pages":"335-345"},"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/6a/a9/jap-14-335.PMC9832147.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10572837","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":"Assessment of effect of accelerated aging on interim fixed dental materials using digital technologies.","authors":"Omar Alageel,&nbsp;Omar Alsadon,&nbsp;Haitham Almansour,&nbsp;Abdullah Alshehri,&nbsp;Fares Alhabbad,&nbsp;Majed Alsarani","doi":"10.4047/jap.2022.14.6.360","DOIUrl":"https://doi.org/10.4047/jap.2022.14.6.360","url":null,"abstract":"<p><strong>Purpose: </strong>This study assessed the physical and mechanical properties of interim crown materials fabricated using various digital techniques after accelerated aging.</p><p><strong>Materials and methods: </strong>Three groups of interim dental restorative materials (N = 20) were tested. The first group (CO) was fabricated using a conventional manual method. The second group (ML) was prepared from prefabricated resin blocks for the milling method and cut into specimen sizes using a cutting disc. The third group (3D) was additively manufactured using a digital light-processing (DLP) 3D printer. Aging acceleration treatments using toothbrushing and thermocycling simulators were applied to half of the specimens corresponding to three years of usage in the oral environment (N = 10). Surface roughness (Ra), Vickers microhardness, 3-point bending, sorption, and solubility tests were performed. A 2-way analysis of variance (ANOVA) and Fisher's multiple comparison test were used to compare the results among the groups.</p><p><strong>Results: </strong>The mean surface roughness (Ra) of the resin after accelerated aging was significantly higher in the CO and ML groups than that before aging, but not in the 3D group. All groups showed reduced hardness after accelerated aging. The flexural strength values were highest in the 3D group, followed by the ML and CO groups after accelerated aging. Accelerated aging significantly reduced water sorption in the ML group.</p><p><strong>Conclusion: </strong>According to the tested material and 3D printer type, both 3D-printed and milled interim restoration resins showed higher flexural strength and modulus, and lower surface roughness than those prepared by the conventional method after accelerated aging.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 6","pages":"360-368"},"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/04/ce/jap-14-360.PMC9832148.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10579564","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":"Accuracy of 14 intraoral scanners for the All-on-4 treatment concept: a comparative <i>in vitro</i> study.","authors":"Gözde Kaya,&nbsp;Caglar Bilmenoglu","doi":"10.4047/jap.2022.14.6.388","DOIUrl":"https://doi.org/10.4047/jap.2022.14.6.388","url":null,"abstract":"<p><strong>Purpose: </strong>This <i>in vitro</i> study aimed to evaluate the accuracy of 14 different intraoral scanners for the All-on-4 treatment concept.</p><p><strong>Materials and methods: </strong>Four implants were placed in regions 13, 16, 23, and 26 of an edentulous maxillary model that was poured with scannable Type 4 gypsum to imitate the All-on-4 concept. The cast was scanned 10 times for each of 14 intraoral scanners (Primescan, iTero 2, iTero 5D, Virtuo Vivo, Trios 3, Trios 4, CS3600, CS3700, Emerald, Emerald S, Medit i500, BenQ BIS-I, Heron IOS, and Aadva IOS 100P) after the polyether ether ketone scanbody was placed. For the control group, the gypsum model was scanned 10 times with an industrial scanner. The first of the 10 virtual models obtained from the industrial model was chosen as the reference model. For trueness, the data of the 14 dental scanners were superimposed with the reference model; for precision, the data of all 14 scanners were superimposed within the groups. Statistical analyses were performed using the Kolmogorov-Smirnov, Shapiro-Wilks, and Dunn's tests.</p><p><strong>Results: </strong>Primescan showed the highest trueness and precision values (<i>P</i> < .005), followed by the iTero 5D scanner (<i>P</i> < .005).</p><p><strong>Conclusion: </strong>Some of these digital scanners can be used to make impressions within the All-on-4 concept. However, the possibility of data loss due to artifacts, reflections, and the inability to combine the data should be considered.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 6","pages":"388-398"},"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/fa/e8/jap-14-388.PMC9832143.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10572833","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 repair methods and materials on the flexural strength of 3D-printed denture base resin.","authors":"Hamile Emanuella do Carmo Viotto,&nbsp;Marcela Dantas Dias Silva,&nbsp;Thaís Soares Bezerra Santos Nunes,&nbsp;Sabrina Romão Gonçalves Coelho,&nbsp;Ana Carolina Pero","doi":"10.4047/jap.2022.14.5.305","DOIUrl":"https://doi.org/10.4047/jap.2022.14.5.305","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study was to evaluate the flexural strength of a 3D-printed denture base resin (Cosmos Denture), after different immediate repair techniques with surface treatments and thermocycling.</p><p><strong>Materials and methods: </strong>Rectangular 3D-printed denture base resin (Cosmos Denture) specimens (N = 130) were thermocycled (5,000 cycles, 5℃ and 55℃) before and after the different repair techniques (n = 10 per group) using an autopolymerized acrylic resin (Jet, J) or a hard relining resin (Soft Confort, SC), and different surface treatments: Jet resin monomer for 180 s (MMA), blasting with aluminum oxide (JAT) or erbium: yttrium-aluminum-garnet laser (L). The control group were intact specimens. A three-point flexural strength test was performed, and data (MPa) were analyzed by ANOVA and Games-Howell post hoc test (α = 0.05). Each failure was observed and classified through stereomicroscope images and the surface treatments were viewed by scanning electron microscope (SEM).</p><p><strong>Results: </strong>Control group showed the highest mean of flexural strength, statistically different from the other groups (<i>P</i> < .001), followed by MMA+J group. The groups with L treatment were statistically similar to the MMA groups (<i>P</i> > .05). The JAT+J group was better than the SC and JAT+SC groups (<i>P</i> < .05), but similar to the other groups (<i>P</i> > .05). Adhesive failures were most observed in JAT groups, especially when repaired with SC. The SEM images showed surface changes for all treatments, except JAT alone.</p><p><strong>Conclusion: </strong>Denture bases fabricated with 3D-printed resin should be preferably repaired with MMA+J. SC and JAT+SC showed the worst results. Blasting impaired the adhesion of the SC resin.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 5","pages":"305-314"},"PeriodicalIF":2.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/da/a6/jap-14-305.PMC9672696.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40491186","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":"Grain size, crystalline phase and fracture toughness of the monolithic zirconia.","authors":"Kodchakorn Bocam,&nbsp;Chuchai Anunmana,&nbsp;Trinuch Eiampongpaiboon","doi":"10.4047/jap.2022.14.5.285","DOIUrl":"https://doi.org/10.4047/jap.2022.14.5.285","url":null,"abstract":"<p><strong>Purpose: </strong>This study evaluated the relationship among translucency, crystalline phase, grain size, and fracture toughness of zirconia.</p><p><strong>Materials and methods: </strong>Four commercial zirconia - Prettau^®Anterior^® (PA), Prettau^® (P), InCorisZI (ZI), and InCorisTZI (TZI)- were selected for this study. The bar specimens were prepared to determine fracture toughness by using chevron notched beam method with four-point bending test. The grain size was evaluated by a mean linear intercept method using a scanning electron microscope. X-ray diffraction and Rietveld refinement were performed to evaluate the amount of tetragonal and cubic phases of zirconia. Contrast ratio (CR) was measured to investigate the level of translucency.</p><p><strong>Results: </strong>PA had the lowest fracture toughness among other groups (<i>P</i> < .05). In addition, the mean fracture toughness of P was significantly less than that of ZI, but there was no difference compared with TZI. Regarding grain size measurement, PA had the largest average grain size among the groups. P obtained larger grain size than ZI and TZI (<i>P</i> < .05). However, there was no significant difference between ZI and TZI. Moreover, PA had the lowest CR value compared with the other groups (<i>P</i> < .05). This means PA was the most translucent material in this study. Rietveld refinement found that PA presented the greatest percentage of cubic phase, followed by TZI, ZI, and P, respectively.</p><p><strong>Conclusion: </strong>The different approaches are used by manufacturers to fabricate various types of translucent zirconia with different levels of translucency and mechanical properties, which should be concerned for material selection for successful clinical outcome.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 5","pages":"285-293"},"PeriodicalIF":2.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/70/ce/jap-14-285.PMC9672698.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40505383","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}