1. Periodontal condition in orthodontically treated and untreated indivuduals. I. Loss of attachment, gingival pocket depth and clinical crown height;Zachrisson;Angle Orthod,1973
2. Periodontal condition in orthodontically treated and untreated individuals. II. Alveolar bone loss: radiographic findings;Zachrisson;Angle Orthod,1974
3. Gingival condition associated with orthodontic treatment;Zachrisson;Angle Orthod,1972
4. Effects of orthodontic attachments on the gingival health of permanent second molars;Alexander;Am J Orthod Dentofacial Orthop,1991
5. The association of orthodontic treatment and fixed retainers with gingival health;Levin;J Periodontol,2008