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Specimens were ultrasonically cleaned in isopropanol for 180, 210, and 240 s and post\u2010cured for 30\u00a0min, and either stored in water (37\u00b0C, 24\u00a0h) or aged for 10,000 thermal cycles (5\u201355\u00b0C). Vickers hardness, flexural strength, shear bond strength, fracture load, and fit were assessed. Cleaning time affected only Vickers hardness, while thermal aging resulted in significantly degraded mechanical properties. Fracture load increased with thickness but decreased after aging, from 1240.3\u00a0\u00b1\u00a0261.4 N to 955.3\u00a0\u00b1\u00a0145.3 N for 2.0\u00a0mm crowns. Marginal gaps ranged from 54.09 to 79.43\u00a0\u00b5m, and internal gaps from 46.62 to 101.55\u00a0\u00b5m, and both decreased after aging. Crown thickness and thermal aging significantly impacted mechanical properties, whereas cleaning time had minimal impact. For durability and resistance to maximum clenching forces, a 2\u00a0mm thickness is recommended. These findings offer valuable insights into optimal post\u2010processing and design to enhance the clinical longevity of DLP\u2010fabricated crowns.<\/jats:p>","DOI":"10.1111\/eos.70048","type":"journal-article","created":{"date-parts":[[2025,11,3]],"date-time":"2025-11-03T04:25:49Z","timestamp":1762143949000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Effect of thickness and aging on key mechanical properties of 3D\u2010printed crowns"],"prefix":"10.1111","volume":"134","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3575-4174","authenticated-orcid":false,"given":"Pei\u2010Wen","family":"Peng","sequence":"first","affiliation":[{"name":"School of Dental Technology Taipei Medical University  Taipei 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