The main objective of endodontic therapy is the thorough mechanical and chemical clensing of the entire pulp cavity and its complete obturation with an inert filling material. However, the pulps of primary and permanent teeth respond differently to trauma, bacterial invasion, irritation and medication.
The primary pulp responds more rapidly to the effects of dentinal carries than does the permanent pulp, so, pulp treatment of children, and purpose of pulp treatment in primary tooth is not only removal of inflamed pulp tissue, pain relief, but conservation of arch form, preservation of mastication, important to normal occlusal of relationship future permanent teeth.
For successive pulp treatment in primary dentition, it is necessary to understand about pulp form of primary teeth, anatomy form of root canal, variation, root formation, and special problem relation to primary tooth resorption. But in pedodontics, now it is deficient to study of root canal and root form.
Dentists have been treating maxillary first molars endodontically for years under the general assumption that these teeth have three root canals.
Before an article written by Weine, virtually all dentist, thought of the mesiobuccal root (MBR) of the maxillary first molar as having only one canal.
In upper primary molar, canal configuration of mesial root has the most variation same as upper molar. If not canal treatment is completely, most of all endodontic treatment should be failed.
This study was to investigate the incidence of tourth canal of upper primary molar that extracted and case report.
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