In Vitro Mechanical Performance of Orthodontic Auxiliary Photopolymerisable Resins under Simulated Oral Conditions

The growing use of clear aligners in orthodontics has stimulated the advancement of biomechanical materials designed to enhance treatment effectiveness. The clinical success of these systems depends largely on their mechanical characteristics. This study aimed to assess the Young’s modulus of Clear-Blokker® (Scheu Dental), a photopolymerisable resin employed for bonding clear aligners, and to analyze its mechanical response under varying curing durations (5 s and 10 s) and storage environments (dry condition versus immersion in artificial saliva at 37 °C). Forty-eight cylindrical samples were fabricated and tested under quasistatic compression after a 14-day period. Statistical evaluation was conducted using multifactorial ANOVA with a 5% significance threshold. Specimens aged in artificial saliva demonstrated a notably lower Young’s modulus than those maintained in dry storage (p = 0.0213), whereas curing duration had no significant effect. Clear-Blokker® exhibits mechanical behavior comparable to that of clear aligner materials, indicating its potential suitability as a biomechanical support in orthodontic applications. Nonetheless, additional clinical investigations are necessary to validate its durability and long-term performance under intraoral conditions.