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Belser, Urs C; Grütter, Linda; Vailati, Francesca; Bornstein, Michael M; Weber, Hans-Peter; Buser, Daniel (2009). Outcome evaluation of early placed maxillary anterior single-tooth implants using objective esthetic criteria: a cross-sectional, retrospective study in 45 patients with a 2- to 4-year follow-up using pink and white esthetic scores. Journal of periodontology, 80(1), pp. 140-51. Chicago, Ill.: American Academy of Periodontology 10.1902/jop.2009.080435
