Black spaces between maxillary incisors: what is the aesthetic limit? . Bioscience Journal, Uberlândia, MG, v. 31, n. 5, p. 1586–1593, 2015. DOI: 10.14393/BJ-v31n5a2015-29092. Disponível em: https://seer.ufu.br/index.php/biosciencejournal/article/view/29092. Acesso em: 3 jan. 2026.