1. Functional problems in orthodontic patients out of retention;Janson;Eur J Orthod,1981
2. Consideration of dentofacial growth in long-term retention and stability;Nanda;Am J Orthod Dentofacial Orthop,1992
3. Comparison of occlusal contacts with the use of Hawley and clear overlay retainers;Sauget;Angle Orthod,1997
4. Evaluation diagnosis and treatment of occlusal problems;Dawson,1989
5. Occlusal contacts following orthodontic treatment: a follow-up study;Razdolsky;Angle Orthod,1988