U.S., March 5 -- ClinicalTrials.gov registry received information related to the study (NCT07449598) titled 'Evaluation of Physical Changes in Single-Layer and Multi-Layer Clear Aligners' on Feb. 15.
Brief Summary: aim of the study: to evaluate and compare the surface roughness (Ra, Rq, Rz), Vickers microhardness (VHN), and thickness of single-layer and multi-layer clear aligner sheets.
material and methods: the study will be conducted on clear aligners fabricated from two commercial thermoplastic materials: single-layer (0.76 mm, ) and multi-layer (0.76 mm, ). Each material will be evaluated at three stages: before thermoforming, after thermoforming on 3D-printed casts, and after 2 weeks of intraoral wear.
Specimen Preparation For each ...