Border molding training for mandibular dentures is part of the practical training carried out in the fourth year for dental students at TMDU. During training, each student prepares a custom impression tray made of autopolymerizing acrylic resin. Through 2008, students first applied petroleum jelly on the surface of plaster models, heated the impression materials onto the border of the trays, placed them briefly in warm water, and then placed the trays on the models. Thereafter, the students used their fingers to apply direct pressure to the compound and mold the model form.