Effect of Fixed and Removable Space Maintainer on Some Salivary Parameters: An In-Vivo Study

lower lingual holding arch space maintainer is an orthodontic device which connects two molars lower dental arch. it has an archwire, adapted to the lingual side of the lower anterior teeth, that soldered to the bands on first permanent molar

Removable Partial Denture consists of a pink or gum-colored plastic base to which the new, artificial, replacement teeth are attached to. a metal framework holds the denture in place inside the mouth