{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T16:40:20Z","timestamp":1789576820548,"version":"build-2803163510"},"reference-count":33,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2023,10,27]],"date-time":"2023-10-27T00:00:00Z","timestamp":1698364800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Some resin polymers available for three-dimensional (3D) printing are slightly elastic, which may be advantageous when used for full crown coverage of the primary teeth. This study was performed to evaluate the mechanical properties of two types of 3D-printed resin crowns in terms of strength and surface characteristics. Polymer resins used for temporary crowns (TCs) and temporary flexible dentures (TFDs) were tested. Digitally designed crowns with different thicknesses (0.4 and 0.6 mm) were 3D-printed. Milled zirconia crowns were used as the control. The static and dynamic fracture loads of the crowns were measured. The crown surface was evaluated using scanning electron microscopy. The average strength did not differ between the types of crowns. The differences between the dynamic and static fracture loads were insignificant. In the TC group, thicker crowns showed lower strength both under static and dynamic loads. After thermomechanical loading, microcracks and dropouts of macrofillers were detected on the surface of all types of resin crowns. The deposition of abraded debris occurred more in the TFD group. The 3D-printed resin crowns were thought to endure biting forces in children. However, some limitations of the material itself should be improved for consideration as a new treatment option in pediatric dentistry.<\/jats:p>","DOI":"10.3390\/polym15214241","type":"journal-article","created":{"date-parts":[[2023,10,27]],"date-time":"2023-10-27T09:56:36Z","timestamp":1698400596000},"page":"4241","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Strength and Surface Characteristics of 3D-Printed Resin Crowns for the Primary Molars"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3264-4014","authenticated-orcid":false,"given":"Soyoung","family":"Park","sequence":"first","affiliation":[{"name":"Department of Pediatric Dentistry, Dental and Life Science Institute & Dental Research Institute, School of Dentistry, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2174-7333","authenticated-orcid":false,"given":"Wontak","family":"Cho","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, Dental and Life Science Institute & Dental Research Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1669-2975","authenticated-orcid":false,"given":"Hyeonjong","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul 03722, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jihyeon","family":"Bae","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, Dental and Life Science Institute & Dental Research Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0431-5574","authenticated-orcid":false,"given":"Taesung","family":"Jeong","sequence":"additional","affiliation":[{"name":"Department of Pediatric Dentistry, Dental and Life Science Institute & Dental Research Institute, School of Dentistry, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jungbo","family":"Huh","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, Dental and Life Science Institute & Dental Research Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9777-0196","authenticated-orcid":false,"given":"Jonghyun","family":"Shin","sequence":"additional","affiliation":[{"name":"Department of Pediatric Dentistry, Dental and Life Science Institute & Dental Research Institute, School of Dentistry, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,10,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1046\/j..2003.com122.x","article-title":"The world oral health report 2003: Continuous improvement of oral health in the 21st century\u2014The approach of the who global oral health programme","volume":"31","author":"Petersen","year":"2003","journal-title":"Community Dent. 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