Journal of Advanced Prosthodontics最新文献

{"title":"Reliability of implant stability measuring devices depending on various clinical conditions: an <i>in vitro</i> study.","authors":"Han-Na Lee,&nbsp;Myoung-Sub Kim,&nbsp;Jeong-Yol Lee,&nbsp;Xu Zihan,&nbsp;Jae-Jun Ryu,&nbsp;Ji-Suk Shim","doi":"10.4047/jap.2023.15.3.126","DOIUrl":"https://doi.org/10.4047/jap.2023.15.3.126","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study was to evaluate the reliability of implant stability measuring devices depending on the location of the implant and the position of the patient.</p><p><strong>Materials and methods: </strong>Six implants were installed in different dentate sextants of six artificial bone models. Implant stability was measured in three conditions of the bone model (without mounting on a phantom head, mounted on a phantom head in supine position, and mounted on a phantom head in upright position). A resonance frequency analysis device (Osstell) and two damping capacity analysis devices (Periotest and Anycheck) were used to measure implant stability. The values measured outside the phantom head were treated as controls, and the values inside the phantom head were compared using an independent <i>t</i>-test.</p><p><strong>Results: </strong>Osstell showed different results in two of the six divisions in both the supine and upright positions compared to outside of the mouth (<i>P</i> < .05). Periotest showed different results in all six parts in the supine position and in five parts in the upright position compared to outside of the mouth (<i>P</i> < .05). While Anycheck showed different results in five areas in the supine position compared to outside of the mouth, it showed different results in only one area in the upright position (<i>P</i> < .05).</p><p><strong>Conclusion: </strong>In the difficult implant position for the operator to access, the implant stability measuring devices show less reliability. The accessibility of implant is greatly affected in the order of Osstell, Anycheck, and Periotest.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/32/f2/jap-15-126.PMC10333099.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10175404","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":"Comparison of fit and trueness of zirconia crowns fabricated by different combinations of open CAD-CAM systems.","authors":"Eun-Bin Bae,&nbsp;Won-Tak Cho,&nbsp;Do-Hyun Park,&nbsp;Su-Hyun Hwang,&nbsp;So-Hyoun Lee,&nbsp;Mi-Jung Yun,&nbsp;Chang-Mo Jeong,&nbsp;Jung-Bo Huh","doi":"10.4047/jap.2023.15.3.155","DOIUrl":"https://doi.org/10.4047/jap.2023.15.3.155","url":null,"abstract":"<p><strong>Purpose: </strong>This study aims to clinically compare the fitness and trueness of zirconia crowns fabricated by different combinations of open CAD-CAM systems.</p><p><strong>Materials and methods: </strong>Total of 40 patients were enrolled in this study, and 9 different zirconia crowns were prepared per patient. Each crown was made through the cross-application of 3 different design software (EZIS VR, 3Shape Dental System, Exocad) with 3 different processing devices (Aegis HM, Trione Z, Motion 2). The marginal gap, absolute marginal discrepancy, internal gap(axial, line angle, occlusal) by a silicone replica technique were measured to compare the fit of the crown. The scanned inner and outer surfaces of the crowns were compared to CAD data using 3D metrology software to evaluate trueness.</p><p><strong>Results: </strong>There were significant differences in the marginal gap, absolute marginal discrepancy, axial and line angle internal gap among the groups (<i>P</i> < .05) in the comparison of fit. There was no statistically significant difference among the groups in terms of occlusal internal gap. The trueness ranged from 36.19 to 43.78 µm but there was no statistically significant difference within the groups (<i>P</i> > .05).</p><p><strong>Conclusion: </strong>All 9 groups showed clinically acceptable level of marginal gaps ranging from 74.26 to 112.20 µm in terms of fit comparison. In the comparison of trueness, no significant difference within each group was spotted. Within the limitation of this study, open CAD-CAM systems used in this study can be assembled properly to fabricate zirconia crown.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/d7/0e/jap-15-155.PMC10333096.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9872420","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 internal structures on the accuracy of 3D printed full-arch dentition preparation models in different printing systems.","authors":"Teng Ma,&nbsp;Tiwu Peng,&nbsp;Yang Lin,&nbsp;Mindi Zhang,&nbsp;Guanghui Ren","doi":"10.4047/jap.2023.15.3.145","DOIUrl":"https://doi.org/10.4047/jap.2023.15.3.145","url":null,"abstract":"<p><strong>Purpose: </strong>The objective of this study was to investigate how internal structures influence the overall and marginal accuracy of full arch preparations fabricated through additive manufacturing in different printing systems.</p><p><strong>Materials and methods: </strong>A full-arch preparation digital model was set up with three internal designs, including solid, hollow, and grid. These were printed using three different resin printers with nine models in each group. After scanning, each data was imported into the 3D data processing software together with the master cast, aligned and trimmed, and then put into the 3D data analysis software again to compare the overall and marginal deviation whose results are expressed using root mean square values and color maps. To evaluate the trueness of the resin model, the test data and reference data were compared, and the precision was evaluated by comparing the test data sets. Color maps were observed for qualitative analysis. Data were statistically analyzed by one-way analysis of variance and Bonferroni method was used for post hoc comparison (α = .05).</p><p><strong>Results: </strong>The influence of different internal structures on the accuracy of 3D printed resin models varied significantly (<i>P</i> < .05). Solid and grid models showed better accuracy, while the hollow model exhibited poor accuracy. The color maps show that the resin models have a tendency to shrink inwards.</p><p><strong>Conclusion: </strong>The internal structure design influences the accuracy of the 3D printing model, and the effect varies in different printing systems. Irrespective of the kind of printing system, the printing accuracy of hollow model was observed to be worse than those of solid and grid models.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/c7/85/jap-15-145.PMC10333097.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9872424","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 abutment types and resin cements on the esthetics of implant-supported restorations.","authors":"Asena Çeken,&nbsp;Hamiyet Kılınç,&nbsp;Sedanur Turgut","doi":"10.4047/jap.2023.15.3.114","DOIUrl":"https://doi.org/10.4047/jap.2023.15.3.114","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of the study was to evaluate the optical properties of new generation (3Y-TZP) monolithic zirconia (MZ) with different abutment types and resin cement shades.</p><p><strong>Materials and methods: </strong>A1/LT MZ specimens were prepared (10 × 12 × 1 mm, N = 30) and divided into 3 groups according to cement shades as transparent (Tr), yellow (Y) and opaque (O). Abutment specimens were obtained from 4 different materials including zirconia (Group Z), hybrid (Group H), titanium (Group T) and anodized yellow titanium (Group AT). MZ and abutment specimens were then cemented. L^*, a^*, and b^* parameters were obtained from MZ, MZ + abutment, and MZ + abutment + cement. ΔE₀₀₁^* (between MZ and MZ + abutment), ΔE₀₀₂^* (between MZ and MZ + abutment + cement) and ΔE₀₀₃^* (between MZ + abutment and MZ + abutment + cement) values were calculated. Statistical analyses included 2-way ANOVA, Bonferroni, and Paired Sample <i>t</i>-Tests (<i>P</i> < .05).</p><p><strong>Results: </strong>Abutment types and resin cements had significant effect on L^*, a^*, b^*, ΔE₀₀₁^*, ΔE₀₀₂^*, and ΔE₀₀₃^* values (<i>P</i> < .001). Without cementation, whereas zirconia abutment resulted in the least discoloration (ΔE₀₀₁^* = 0.68), titanium abutment caused the most discoloration (ΔE₀₀₁^* = 4.99). The least ΔE₀₀₂^* = 0.68 value was seen using zirconia abutment after cementation with yellow shaded cement. Opaque shaded cement caused the most color change (ΔE₀₀₃^* = 5.24). Cement application increased the L^* values in all groups.</p><p><strong>Conclusion: </strong>The least color change with/without cement was observed in crown configurations created with zirconia abutments. Zirconia and hybrid abutments produced significantly lower ΔE₀₀₂^* and ΔE₀₀₃^* values in combination with yellow shaded cement. The usage of opaque shaded cement in titanium/anodized titanium groups may enable the clinically unacceptable ΔE₀₀^* value to reach the acceptable level.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/1e/0c/jap-15-114.PMC10333101.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9872422","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 the type of resin cement on the fracture resistance of chairside CAD-CAM materials after aging.","authors":"Laura Vitória Rizzatto,&nbsp;Daniel Meneghetti,&nbsp;Marielle Di Domênico,&nbsp;Júlia Cadorin Facenda,&nbsp;Katia Raquel Weber,&nbsp;Pedro Henrique Corazza,&nbsp;Márcia Borba","doi":"10.4047/jap.2023.15.3.136","DOIUrl":"https://doi.org/10.4047/jap.2023.15.3.136","url":null,"abstract":"<p><strong>Purpose: </strong>The study objective was to evaluate the influence of the type of resin cement on the flexural strength and load to fracture of two chairside CAD-CAM materials after aging.</p><p><strong>Materials and methods: </strong>A polymer-infiltrated ceramic network (PICN) and a nanoceramic resin (RNC) were used to produce the specimens. Two types of dual-cure resin cements, a self-adhesive and a universal, were investigated. Bilayer specimens were produced (n = 10) and aged for 6 months in a humid environment before the biaxial flexural strength test (σ_f). Bonded specimens were subjected to a mechanical aging protocol (50 N, 2 Hz, 37℃ water, 500,000 cycles) before the compressive load test (L_f). σ_f and L_f data were analyzed using two-way ANOVA and Tukey tests (α = .05). Chi-square test was used to analyze the relationship between failure mode and experimental group (α = .05).</p><p><strong>Results: </strong>The type of resin cement and the interaction between factors had no effect on the σ_f and L_f of the specimens, while the type of restorative material was significant. RNC had higher σ_f and L_f than PICN. There was a significant association among the type of cracks identified for specimens tested in L_f and the restorative material.</p><p><strong>Conclusion: </strong>The type of resin cement had no effect on the flexural strength and load to fracture of the two investigated CAD-CAM chairside materials after aging.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/44/c0/jap-15-136.PMC10333098.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9872421","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 implant diameter and cantilever length on the marginal bone height changes and stability of implants supporting screw retained prostheses: A randomized double blinded control trial.","authors":"Heba Ezzeldin Khorshid,&nbsp;Noha Ossama Issa,&nbsp;Amr Mohamed Ekram","doi":"10.4047/jap.2023.15.3.101","DOIUrl":"https://doi.org/10.4047/jap.2023.15.3.101","url":null,"abstract":"<p><strong>Purpose: </strong>This randomized controlled trial aimed to evaluate the effect of implants' two different diameters and cantilever lengths on the marginal bone loss and stability of mplants supporting maxillary prostheses.</p><p><strong>Materials and methods: </strong>Ninety-six implants were placed in sixteen completely edentulous maxillary ridges. Patients were randomly divided into two groups: Group A, implants were placed with a cantilever to anterior-posterior AP spread length (CL:AP) at a ratio of 1:3; Group B, implants were placed with a CL:AP at a ratio of 1:2. Patients were further divided into four sub-groups: Groups A1, A2, B1, and B2. Groups A1 and B1 received small diameter implants while Groups A2 and B2 received standard diameter implants. Bone height and stability measurements around each implant were performed at 0, 4, 8 and 24 months after definitive prostheses delivery.</p><p><strong>Results: </strong>Statistical analysis of the mean implant stability and height values revealed an insignificant difference between Group A1 and Group A2 at all the different time intervals while significantly higher values in Group B1 in comparison with Group B2. Results also showed significantly higher values in Group A1 in comparison with Group B1 and an insignificant difference between Group A2 and Group B2 at all the different time intervals.</p><p><strong>Conclusion: </strong>It can be concluded that the use of small diameter implants placed with a CL:AP at a ratio of 1:3 provided predictable results and that the 1:2 CL:AP significantly induced more critical bone loss in the small diameter implants group, which can significantly reduce long term success and survival of implants.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/30/40/jap-15-101.PMC10333100.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10193743","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":"Adhesion of biofilm, surface characteristics, and mechanical properties of antimicrobial denture base resin.","authors":"Ana Beatriz Vilela Teixeira,&nbsp;Mariana Lima da Costa Valente,&nbsp;João Pedro Nunes Sessa,&nbsp;Bruna Gubitoso,&nbsp;Marco Antonio Schiavon,&nbsp;Andréa Cândido Dos Reis","doi":"10.4047/jap.2023.15.2.80","DOIUrl":"https://doi.org/10.4047/jap.2023.15.2.80","url":null,"abstract":"<p><strong>Purpose: </strong>This study incorporated the nanomaterial, nanostructured silver vanadate decorated with silver nanoparticles (AgVO₃), into heat-cured resin (HT) at concentrations of 2.5%, 5%, and 10% and compared the adhesion of multispecies biofilms, surface characteristics, and mechanical properties with conventional heat-cured (HT 0%) and printed resins.</p><p><strong>Materials and methods: </strong>AgVO₃ was incorporated in mass into HT powder. A denture base resin was used to obtain printed samples. Adhesion of a multispecies biofilm of <i>Candida albicans</i>, <i>Candida glabrata</i>, and <i>Streptococcus mutans</i> was evaluated by colony-forming units per milliliter (CFU/mL) and metabolic activity. Wettability, roughness, and scanning electron microscopy (SEM) were used to assess the physical characteristics of the surface. The mechanical properties of flexural strength and elastic modulus were tested.</p><p><strong>Results: </strong>HT 10%-AgVO₃ showed efficacy against <i>S. mutans</i>; however, it favored <i>C. albicans</i> CFU/mL (<i>P</i> < .05). The printed resin showed a higher metabolically active biofilm than HT 0% (<i>P</i> < .05). There was no difference in wettability or roughness between groups (<i>P</i> > .05). Irregularities on the printed resin surface and pores in HT 5%-AgVO₃ were observed by SEM. HT 0% showed the highest flexural strength, and the resins incorporated with AgVO₃ had the highest elastic modulus (<i>P</i> < .05).</p><p><strong>Conclusion: </strong>The incorporation of 10% AgVO₃ into heat-cured resin provided antimicrobial activity against <i>S. mutans</i> in a multispecies biofilm did not affect the roughness or wettability but reduced flexural strength and increased elastic modulus. Printed resin showed higher irregularity, an active biofilm, and lower flexural strength and elastic modulus than heat-cured resin.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":null,"pages":null},"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/7a/b8/jap-15-80.PMC10154147.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9486163","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 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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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}