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Two-layer additively manufactured crown: Proof of concept
Marta Revilla-León1, Amirali Zandinejad2
1AEGD Residency, Comprehensive Dentistry Department, College of Dentistry, Texas A&M University, Dallas, TX, United States; Affiliate Faculty Graduate Prosthodontics, Restorative Dentistry Department, School of Dentistry, University of Washington, Seattle, WA, United States; Revilla Research Center, Madrid, Spain.
Objectives:
To assess the feasibility of additively manufacturing a crown with a 2-layer design.
Methods:
A mandibular first molar tooth preparation titanium die for a full coverage restoration was obtained. The die was used to design a monolayer (ML group) and 2-layer (2L group) anatomically contoured crown. In the ML group, the specimen was manufactured with a hard polymer (Rigur RGD450; Stratasys). In the 2L group, the crown was splinted into 2 parts: the intaglio that represented 25% of the total crown volume that was manufactured with a resilient polymer (Vero; Stratasys) and the exterior that represented the remaining crown volume that was manufactured with a hard polymer (Rigur RGD450; Stratasys). Specimens were manufactured using a material jetting printer (Connex3 Object260; Stratasys). The marginal and internal discrepancies of ML and 2L specimens were visually assessed.
Results:
The ML and 2L specimens were manufactured using a material jetting printer that obtained a visually acceptable marginal and internal discrepancy.
Conclusions:
The 2-layer dental crown can be manufactured using a material jetting printer.
Clinical Significance:
Material jetting technology has the capability to fabricate a 2-layer dental crown design which can be fabricated using materials with different properties.
