1. Ultrastructural changes in the periodontal fibers and their attachment in rat molar periodontium incident to orthodontic tooth movement;Rygh;Scand J Dent Res,1973
2. Ultrastructural vascular changes in pressure zones of rat molar periodontium incident to orthodontic tooth movement;Rygh;Scand J Dent Res,1972
3. Ultrastructural cellular reactions in pressure zones of rat molar periodontium incident to orthodontic tooth movement;Rygh;Acta Odontol Scand,1972
4. Ultrastructural changes in tension zones of rat molar periodontium incident to orthodontic tooth movement;Rygh;Acta Odontol Scand,1974
5. Elimination of hyalinized periodontal tissues associated with orthodontic tooth movement;Rygh;Scand J Dent Res,1974