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A "debt service extension base" enables a district to sell bonds without going to referendum but limits the principal and interest a district can levy against taxpayers to repay those bonds.
They are mostly indicated in long edentulous spans, distal extension bases and non parallel abutments.
Impression procedure forms the basis of a successful Removable Partial Denture however, in distal extension bases the residual ridge must be recorded in functional form and the remaining natural teeth in an anatomic form.