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At least 1,171 records · Page 65Linked to original sources
PubMed1991

Effect of immediate calcium hydroxide treatment and permanent root-filling on periodontal healing in contaminated replanted teeth.

The effect of immediate permanent root-filling and immediate intracanal calcium hydroxide treatment on experimentally contaminated and necrotized periodontal membranes (PDM) in avulsed and subsequently replanted monkey teeth was studied. Almost the entire root surface in the non-endodontically treated control teeth were covered with inflammatory resorption. A significant shift towards ankylosis not associated with root resorption (greater than 80% of the total root surface area) was noted following calcium hydroxide treatment. About two thirds of the root surfaces from the teeth with permanent root fillings showed surface resorptions or ankylosis preceded by root resorption. The root surface area which would have been covered by inflammatory resorption, unless endodontic treatment had been implemented, were instead predominantly covered by either surface resorption (permanent root filling) or ankylosis (calcium hydroxide treatment). Ankylosis compared with surface resorption may in the long term lead to progressive loss of root substance due to replacement resorption. It was concluded that calcium hydroxide may be an excellent initial intracanal treatment in teeth with healthy PDM, but care should be taken not to risk unnecessary development of ankylosis by prolonged treatment of teeth with compromised PDM.

Alveolar Process↗
PubMed1989

Patterns of healing on replanted baboon incisors coated with an allogeneic fibrin-fibronectin protein concentrate.

This study investigated the use of an allogeneic fibrin-fibronectin protein concentrate (AFFP) in preventing ankylosis and root resorption on replanted teeth during healing. In 2 adult male baboons (Papio ursinus) after extraction of the mandibular incisors, the coronal two-thirds of the exposed roots were planed to remove the remnant of the periodontal ligament and the cementum. The exposed dentinal surfaces were demineralized with citric acid at pH 1 for 3 min and notched at the junction between the planed and non-planed surfaces. Before replantation, the experimental roots and alveoli were coated with the AFFP prepared from pooled fresh-frozen baboon plasma. The animals were killed 55 days after operation and histometrical analysis was performed on serial sections cut in the buccolingual direction parallel to the long axis of the recovered specimens. An analysis of variance demonstrated significant differences between the two treatments with regard to the magnitude of ankylosis (greater for citric acid-demineralized plus AFFP-treated surfaces). There were variations in the magnitude of the different patterns of healing both between and within the experimental and control surfaces. Within the limits of the study, in this primate replantation model, the biochemical treatment of surgically exposed and demineralized root surfaces with AFFP did not enhance connective tissue attachment regeneration nor prevent dentoalveolar ankylosis and root resorption.

Alveolar Process↗
PubMed1990

Possible role of cementoblasts in the resorbant organ of human deciduous teeth during root resorption.

Human deciduous teeth undergoing physiologic root resorption were extracted and fixed with a mixture of formaldehyde and glutaraldehyde and processed for scanning (SEM) and transmission (TEM) electron microscopy, and for acid (ACPase) and alkaline phosphatase (ALPase) cytochemistry. The resorbant organ, rich in odontoclasts, cementoblasts, fibroblasts, and macrophages, formed prominent resorption lacunae in root dentin. SEM observations of resorption lacunae treated with trypsin solution showed islands of newly-formed cementum matrix in part of the resorbing dentin surfaces. Such cementum consisted of bundles of densely-arranged collagen fibrils and, in part, contained forming cementocytic lacunae and canaliculi. Active cementoblasts adjacent to odontoclasts on resorbing dentin surfaces showed cuboidal outlines and were characterized by the presence of numerous cisterns of rough endoplasmic reticulum, well-developed Golgi complexes, secretion granules, and many mitochondria. They sometimes formed a thin layer of cementoid and/or cementum matrix upon the resorbing dentin surface. These cementoblasts had ACPase-positive lysosomes in the cell bodies and exhibited intense ALPase activity along the plasma membranes of whole cell surfaces. These results suggest that, during root resorption, 1) active cementoblasts are present adjacent to active odontoclasts and 2) these cementoblasts are involved in remodeling the resorbing dentin surfaces.

Acid Phosphatase↗
PubMed1994

Periodontal conditions of teeth autogenously transplanted by a two-stage technique.

Inflammatory reactions of the marginal periodontal tissues and loss of attachment could partly account for the often occurring rejection of autogenously transplanted mature teeth. The periodontal conditions of transplanted teeth were investigated from 1 month up to 5 years postoperatively. The parameters plaque, bleeding on probing to the bottom of the pocket, probing pocket depth (PPD), gingival recession and probing attachment loss were analysed by multiple regression analysis. No significant difference was found between transplanted and control teeth in bleeding on probing the bottom of the pockets up to 5 years postoperatively with the exception of increased bleeding on probing of the transplanted teeth at the 1-month postsurgery examination. No significant difference of the mean probing depth between transplanted teeth and control teeth was found at the mesio- and distobuccal surfaces. The transplanted teeth at the buccal surface showed increase of the mean pocket depth during the observation period. Increased mean probing depth without progression over time was found at the transplanted teeth compared to the controls at the distolingual, lingual and mesiolingual surfaces. A small mean gingival recession at the transplants was observed. Loss of attachment was recorded at 13% of the surfaces. Totally 50% of the transplants showed loss of attachment and 5% were removed because of extensive attachment loss. On 13% of the transplanted teeth with loss of attachment, root resorption was also found.

Adolescent↗