Methods and compositions for culturing a biological tooth
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United States of America Patent
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Issued Date -
Nov 4, 2004
app pub date -
Jun 3, 2004
filing date -
Nov 29, 2000
priority date (Note) -
Abandoned
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Abstract
Tooth tissues include the pulp mesenchyme that forms the dentin and an epithelium that is responsible for enamel formation. Cells from these tissues were obtained from porcine third molars and were seeded onto a biodegradable scaffold composed of a polyglycolic acid-polylactic acid copolymer. Cell polymer constructs were then surgically implanted into the omentum of athymic nude rats so that the constructs would have a blood supply and these tissues were allowed to develop inside the rats. Histological analysis of 7.5 week-old implants revealed a dentin-like collagenous matrix containing hydroxyapatite mineral surrounding a core of mesenchymal cells that appeared analogous to pulp tissue. Infrequently, columnar epithelial cells were observed as a single layer on the outside of the dentin-like matrix similar to the actual arrangement of ameloblasts over dentin during early tooth development. Developing tooth tissues derived from such cell polymer constructs could eventually be surgically implanted into the gum of an edentulous recipient where the construct would receive a blood supply and develop to maturity, providing the recipient with a biological tooth replacement.
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