Abstract
MTA has been investigated as a root-end filling material. Its mechanism of action has some similarities to that of Ca(OH)2. The purpose of this study was to evaluate the repair process taking place in the delayed replantation of monkey teeth using calcium hydroxide and MTA as root canal filling materials. Five monkeys had their lateral incisors extracted and bench-dried for 60 minutes. After root canal preparation, the teeth were assigned to two groups according to root canal filling material: I, calcium hydroxide; and II, MTA. The same treatment sequence was followed for both groups: coronal seal, periodontal ligament removal, immersion of the tooth in 2% acidulated-phosphate sodium fluoride, irrigation of the socket with saline and replantation. Both groups exhibited replacement resorption, areas of ankylosis and absence of inflammatory root resorption. Statistically similar results (p > 0.05) were observed for both groups regarding replacement root resorption, but the groups differed significantly (p < 0.05) regarding the occurrence of ankylosis. MTA may be a viable clinical option for filling teeth submitted to delayed replantation, and is an acceptable option for treating replanted permanent teeth in order to prevent tooth resorption, particularly when dressing changes are not possible.
Highlights
Avulsion is one the most severe forms of dental trauma because the tooth is completely displaced from its alveolar socket, causing rupture of the neurovascular bundle and pulp tissue damage
The literature has shown that the resorption process can be prevented or controlled with endodontic therapy based on the use of calcium hydroxide [Ca(OH)2] as a temporary root canal filling material.[2]
Group I – Ca(OH)[2] In all the specimens, epithelial reattachment occurred at the cementoenamel junction (CEJ), and the subjacent connective tissue showed few fibroblasts and absence of inflammatory cells
Summary
Avulsion is one the most severe forms of dental trauma because the tooth is completely displaced from its alveolar socket, causing rupture of the neurovascular bundle and pulp tissue damage. The possibility of pulp revascularization after tooth replantation has been reported,[1] its occurrence in mature teeth is rare, and there is a direct relationship between pulp necrosis and inflammatory root resorption in replanted teeth.[1,2] The literature has shown that the resorption process can be prevented or controlled with endodontic therapy based on the use of calcium hydroxide [Ca(OH)2] as a temporary root canal filling material.[2] The successful use of Ca(OH)[2] as an intracanal dressing in replanted teeth is based mainly on its antimicrobial and tissue repair properties.[3]. It has been shown that the mechanisms of action of Ca(OH)[2] and MTA have some similarities.[7,8]
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