Objective To study the effects of different sources of dendritic cells (DCs) on root resorption and healing after allo-geneic tooth transplantation in rats .Methods The BN rats and Lewis rats were respectively used as the donor and recipient teeth for establishing the animal experimental transplantation models and randomly divided into 4 groups ,20 cases in each group :the syn-geneic transplantation group(A) and the allogeneic transplantation groups(B ,C ,D) .The group A and B were infused with PBS buffer solution 0 .5 mL on 7 d before operation .The group C and D were infused with 1 × 106 donor or recipient tolerogenic DCs on 7 d before operation .5 rats randomly selected from each group were sacrificed for performing the pathological examinations of transplanted teeth at the end of 1 ,2 ,4 and 8 weeks .Results The inflammatory cellular infiltration was most severe in the group B , slightest in the group A and moderate in the group C and D .The root resorption was minimal in the group A ,maximal in the group B and moderate in the group C and D (P<0 .05);the root resorption at 2 ,4 weeks had no statistical difference between the group C and D(P>0 .05) ,but which at 8 weeks in the group D was lower than that in the group C .The periodontal membrane healing points at 8 weeks in the group C and D was less than that in the group A ,but more than that in the group B (P<0 .05);the inflam-matory absorption was highest in the group B(P<0 .05);the alternative absorption was lowest in the group A (P<0 .05) .Conclu-sion The two different sources of tolerogenic DCs all could reduce the rejection reaction of allogeneic tooth transplantation ,reduce the root resorption and promote the healing of periodontal membrane .Recipient tolerogenic DCs could reduce the root resorption in late stage even more .

OBJECTIVETo study the effect of osteogenic inducer (dexamethasone, beta-sodium glycerophosphate and Vitamin C) carried by gelatin sponge on healing and remodeling of tooth extraction sockets.

METHODSFifty rabbits were selected. After extracting the first premolars of bilateral maxillary, the right side tooth extraction sockets were filled with gelatin sponge containing osteogenic inducer as experimental side, tooth extraction sockets on left side were filled with gelatin sponge as control. Every ten rabbits were executed at the end of 1, 2, 4, 8, 12 weeks after tooth extraction. Bone density was measured through digital X-ray images. The specimens were examined by histology. The absorption height of alveolar bone at 12 weeks was measured.

RESULTSX-ray measurement showed that the bone density of experimental side was higher than that of control side at 2, 4, 8, 12 weeks, the difference had statistical significance (P<0.01). The histology examination showed that new bone formation in tooth extraction sockets of experimental side was earlier than that in control side. The absorptional height of alveolar bone had significant difference between experimental side and control side (P<0.01), of which experimental side was less.

CONCLUSIONFilling the osteogenic inducer in tooth extraction sockets can promote the healing and new bone formation and prevent from alveolar bone absorption.

Animals ; Bicuspid ; Maxilla ; Rabbits ; Tooth Extraction ; Tooth Socket ; Wound Healing