3 ) Andreasen, J. O.: Traumatic Injuries of the Teeth, Munksgaard 1981, p. 120, 209.
4) Andreasen, J. O., Hjorting-Hansen, E.: Intraalveolar root fractures: radiographic and histologic study of 50 cases, J. Oral Surgery, 25: 414-426, 1967.
5) Michanow icz, A. E., Michanowicz, J. P., Abou-Rass, M.: Cementogenic repair of root fractures, J. A. D. A. 82: 569-579, 1971.