Ultra-structural changes at the apical stop irradiated with CO2 laser - Gonçalves Junior, João; Marchesan, Melissa Andréia; Souza-Gabriel, Aline Evangelista; Vansan, Luiz Pascoal; Sousa Neto, Manoel Damião de; Silva-Sousa, Yara T. C (Photomedicine and Laser Surgery, 2010)