The Effect Of Two Treatments For Primary Teeth's Apical Periodontitis On Dog's Teeth Replacement

Priamary teeth's apical periodontitis is one of the common disease at department of pediatric dentistry. Since 1932, root canal therapy has been considered as a effective treatment to protect primary tooth. Root canal filling pastes for primary tooth have to meet more needs than paste for permanent tooth, such as being absorbed with root simultaneously and doing no harm to permanent tooth germ. At present, most commonly used paste are divided into 4 groups: Zinc oxide eugenols(ZOE), calcium hydroxide(CH), antibiotics and biomaterials. Among those mentioned above, ZOE has high success rate clinically, but Coll and Sadrian pointed out that, there was a 20% incidence of succedaneous tooth's ectopic eruption. Biomaterials, such as mineral trioxide aggregate(MTA), tricalcium phosphate(TCP), have good biocompatibility and bioactivity. It can also induce calcification and bone growth, thus accelerate the healing process at periapical region. However, because of its poor antibiotic effect, it can hardly work at infected periapical tissue. Most widely used clinically now are CH paste and antibiotic pastes, Vitapex and tinidazole paste, as the representatives of the groups mentioned above, are the focus of research...