{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,14]],"date-time":"2026-03-14T20:59:05Z","timestamp":1773521945830,"version":"3.50.1"},"reference-count":46,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2023,3,8]],"date-time":"2023-03-08T00:00:00Z","timestamp":1678233600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Prosthodontics"],"published-print":{"date-parts":[[2024,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To investigate the design and location of supporting structures on the marginal and internal gap of interim restorations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and methods<\/jats:title><jats:p>A mandibular right first molar resin tooth was prepared for a full coverage crown and scanned using a laboratory scanner (3Shape D900). The scanned data were converted into standard tessellation language (STL) format and an indirect prosthesis was designed using computer\u2010aided design (CAD) software (exocad DentalCAD). The STL file was used to fabricate a total of 60 crowns with a 3D printer (EnvisionTEC Vida HD). The crowns were printed using E\u2010Dent C&amp;B MH resin and divided into 4 groups based on four different support structure designs, including supports on the occlusal (0\u00b0 group), buccal and occlusal (45\u00b0 group), buccal (90\u00b0 group), and a new design consisting of horizontal bars placed on all surfaces and line angles (Bar) (<jats:italic>n<\/jats:italic>\u00a0=\u00a015). The silicone replica technique was used to determine the gap discrepancy. Fifty measurements were obtained for each specimen to examine the marginal and internal gaps by using a digital microscope (Olympus SZX16) at \u00d770 magnification. Additionally, the marginal discrepancy at different locations of the tested crowns, including buccal (B), lingual (L), mesial (M), and distal (D), as well as the maximum and minimum marginal gap intervals among groups, were analyzed. The collected data were analyzed using factorial ANOVA, followed by the Tukey HSD test for multiple comparisons (<jats:italic>a<\/jats:italic>\u00a0=\u00a00.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>There was a significant difference in marginal and internal gaps among the groups (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001). The buccal placement supports (90\u00b0 group) had the least marginal and internal discrepancies (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001). The new design group showed the highest marginal and internal gap. The marginal discrepancy in different locations of the tested crowns (B, L, M, D) was found to be significantly different among the groups (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001). The mesial margin of the Bar group had the largest marginal gap, whereas the buccal margin of the 90\u00b0 group had the lowest marginal gap. The new design had a significantly smaller difference between the maximum and minimum marginal gap intervals than other groups (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The location and design of the supporting structures affected the marginal and internal gaps of an interim crown. The buccal placement of supporting bars (90\u00b0 printing orientation) showed the smallest mean internal and marginal discrepancies.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jopr.13668","type":"journal-article","created":{"date-parts":[[2023,2,22]],"date-time":"2023-02-22T11:56:11Z","timestamp":1677066971000},"page":"188-194","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Effect of a new support design on the marginal and internal gap of additively manufactured interim crowns using direct light deposition technology"],"prefix":"10.1111","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1234-7744","authenticated-orcid":false,"given":"Leila Nasiry","family":"Khanlar","sequence":"first","affiliation":[{"name":"Department of Comprehensive Dentistry College of Dentistry, Texas A&amp;M University  Dallas Texas USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Claire","family":"Francis","sequence":"additional","affiliation":[{"name":"Department of Comprehensive Dentistry College of Dentistry, Texas A&amp;M University  Dallas Texas USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Abdul","family":"Basir Barmak","sequence":"additional","affiliation":[{"name":"Department of Comprehensive Dentistry EIOH Medical Center, University of Rochester  Rochester New York USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alma L. Salazar","family":"Rios","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics College of Dentistry, Texas A&amp;M University  Dallas Texas USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Reza Eftekhar","family":"Ashtiani","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, School of Dentistry Shahid Beheshti University of Medical Sciences  Tehran Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8970-9611","authenticated-orcid":false,"given":"Amirali","family":"Zandinejad","sequence":"additional","affiliation":[{"name":"Department of Comprehensive Dentistry College of Dentistry, Texas A&amp;M University  Dallas Texas USA"},{"name":"Private Practice  Arlington Texas USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,3,8]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2005.03.013"},{"key":"e_1_2_8_3_1","first-page":"401","volume-title":"Contemporary fixed prosthodontics","author":"Rosenstiel SF","year":"2016"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(87)90363-5"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(91)90239-S"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/sj.bdj.2010.675"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(91)90225-L"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dental.2010.11.012"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2015.03.007"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dental.2011.10.014"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/jopr.12510"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.2341\/18-229-L"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1902\/jop.2011.110115"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1098\/rsif.2013.0203"},{"key":"e_1_2_8_15_1","first-page":"454","article-title":"Applications of rapid prototyping technology in maxillofacial prosthetics","volume":"17","author":"Sykes LM","year":"2004","journal-title":"Int J Prosthodont"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2014.11.004"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dental.2017.10.003"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2015.12.002"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/J.prosdent.2021.08.010"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1111\/jerd.12535"},{"key":"e_1_2_8_21_1","unstructured":"ASTM International Committee.F42 on Additive Manufacturing Technologies;ASTM International:West Conshohocken PA USA.2009. 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