Keywords
dental materials
Dentistry
heat
polylactic acid copolymer
three-dimensional printing
Saccharum
technology
How to Cite
Abstract
Background: The evolution of digital technology in dentistry has enabled the fabrication of restorations using subtractive or additive methods. Polylactic acid (PLA), derived from renewable resources such as sugarcane, is being considered as an alternative to fast-curing acrylic for the fabrication of provisional prostheses using three-dimensional printing. Purpose: To determine the thermal properties of provisional crowns fabricated three-dimensionally with PLA in vitro. Methods: A quasi-experimental in vitro study was conducted. Thirty preparations were made on natural teeth, scanned with a MEDIT i500, and designed in EXOCAD. The crowns were printed with a 135° deposition angle of the PLA filament and divided into two groups: one exposed to heat by immersion in a water bath between 60 °C and 95 °C for 1 to 5 minutes, and the other was exposed to cold by immersion in ice water at 2 °C for the same time. Results: Measurements taken before and after thermal testing showed a constant mean of 1200 µm in the mesiodistal direction across the 30 crowns analyzed. Conclusion: The PLA-printed crowns did not exhibit dimensional changes due to contraction or expansion under the evaluated thermal conditions. This suggests that it is stable and potentially viable as a provisional material for dental restorations.
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