Bilateral edentulous spaces located posterior to the remaining natural teeth.
Unilateral edentulous space located posterior to the remaining natural teeth.
Unilateral edentulous area with natural teeth located both anterior and posterior to it .
A single but bilateral (crossing the midline) edentulous area located anterior to the remaining natural teeth.
An edentulous area bound by teeth anteriorly and posteriorly, but where the anterior teeth is not suitable to be used as abutment.
An edentulous situation where the bounded teeth are capable of total support of the prosthesis.