Fw: New question-answer for the previous qs

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Answer: EExternal root resorption initiates in the periodontium, affecting the external surface of the tooth and is NOT initiated from within the pulp. It may or may not invade the dental pulp. Radiographically, the radiolucency may appear superimposed over the canal space, but the defect WILL SHIFT as the tube head angulation changes. Any of the following may cause external resoprtion:- Excessive Mechanical Forces- Impacted teeth- Periapical inflammation- Tumors or cystsInternal resorption is a pathologic process that is “initiated within the pulp space with loss of dentin and possible invasion of the cementum; may or may not perforate to the external root surfaceâ€. AAE Glossary Radiographically, the radiolucuency is well-centered and well-bordered. “Pink tooth†is not the sole indicator of internal

resorption.LeeFrom: Dr Avery <avery_dr@...>Subject: New question Date: Tuesday, 5 July, 2011, 21:09Hi thereExternal root resorption may be attributed to which of the following?1). Tumors and cysts2). Impacted teeth3). Excessive mechanical or occlusal forces4). Periapical inflammation.A. (1) and (2)B. (2) and (3)C. (1), (2), and (3)D. (2), (3) and (4)E. all of the aboveLee