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首页> 外文期刊>Dental traumatology: official publication of International Association for Dental Traumatology >Periapical tissue reactions to calcium hydroxide and MTA after external root resorption as a sequela of delayed tooth replantation
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Periapical tissue reactions to calcium hydroxide and MTA after external root resorption as a sequela of delayed tooth replantation

机译：根部外吸收后根尖组织对氢氧化钙和MTA的反应是牙齿延迟种植的后遗症

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摘要

Clinical experience has shown that most avulsed teeth are replanted after a long extra-alveolar time and dry or inadequate wet storage, causing necrosis of periodontal ligament cells. This condition invariably leads to development of external root resorption, leaving the filling material in contact with the periapical connective tissues. In this study, the periapical tissue reactions to calcium hydroxide (CH) and mineral trioxide aggregate (MTA) were evaluated after occurrence of external root resorption as an expected sequela of delayed tooth replantation. Twenty male Wistar rats (Rattus norvegicus, albinus) had their right upper incisor extracted and maintained in dry storage for 60min. Then, the dental papilla, enamel organ, pulp tissue, and periodontal ligament were removed, and the teeth were immersed in a 2% acidulated phosphate sodium fluoride solution, pH 5.5, for 10min. The teeth were randomly assigned into two groups (n=10), in which the canals were filled with either a CH and saline paste (CH group) or MTA (MTA group). The sockets were irrigated with saline, and the teeth were replanted. After 80days, it was possible to observe large areas of replacement root resorption and some areas of inflammatory root resorption in both groups. More severe inflammatory tissue reaction was observed in contact with calcium hydroxide compared with the mineral trioxide aggregate. New bone formation was more intense at the bottom of the socket in the MTA group. In conclusion, as far as periapical tissue compatibility is concerned, intracanal MTA can be considered as a viable option for root canal filling in delayed tooth replantation, in which external root resorption is an expected sequela.
机译：临床经验表明，大多数脱牙的牙齿经过长时间的牙槽外种植以及干燥或不充分的湿存储后会被重新种植，从而导致牙周膜细胞坏死。这种情况总是导致外部根吸收的发展，使填充材料与根尖周结缔组织接触。在这项研究中，根尖吸收发生后，根尖周组织对氢氧化钙（CH）和三氧化二矿骨料（MTA）的反应被评估为延迟植牙的预期后遗症。取出二十只雄性Wistar大鼠（Rattus norvegicus，albinus）的右上切牙并在干燥条件下保持60分钟。然后，去除牙乳头，牙釉质器官，牙髓组织和牙周膜，并将牙齿浸入pH 5.5的2％酸化磷酸盐氟化钠溶液中10分钟。牙齿被随机分为两组（n = 10），其中根管充填有CH和盐浆（CH组）或MTA（MTA组）。窝用生理盐水冲洗，并重新种植牙齿。 80天后，两组均观察到大面积的置换根吸收和炎性根吸收。与三氧化二矿物聚集体相比，与氢氧化钙接触时观察到更严重的炎症组织反应。在MTA组中，窝底部的新骨形成更加强烈。总之，就根尖周组织的相容性而言，在延迟的牙齿再植中，根管内MTA可被认为是根管充填的可行选择，其中外根吸收是预期的后遗症。

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