Retromylohyiod fossacontents • • • • • • Definition Introduction Boundaries Classification Method for recording Clinical significance . GPT-4 . posteriorly by the retromylohyoid curtain.Definition • An anatomic area in the alveololingual sulcus just lingual to the retromolar pad bounded anteriorly by the mylohyoid ridge. inferiorly by the floor of the alveololingual sulcus. and lingually by the anterior tonsillary pillar when the tongue is in relaxed position. INTRODUCTION • The distolingual vestibule of alvelolingual sulcus is referred to as the lateral throat form or retromylohyoid fossa. . .• The retro mylohyoid fossa is the pouch forming the posterior terminus of the alveolingual sulcus on each side. posterolaterally by the superior constrictor muscle.Boundaries • The lateral throat form is bounded anteriorly by the mylohyoid muscle. and medially by the tongue. posteromedially by the palatoglossus muscle. . laterally by the pear shaped pad. as viewed from the lingual result from the stronger intrinsic and extrinsic tongue muscles. which usually place the retromylohyoid fossa.• The mylopharyngeus. buccopharyngeus and glossopharyngeus parts of the superior constrictor muscle are thin and easily displaceable. as they oppose the weaker superior constrictor muscle.curve of the mandibular denture. . The so called S. • The posterior limit of the mandibular denture is determined mainly by palatoglossus muscle and somewhat by weaker superior constrictor of pharynx.This area is called retromylohyoid curtain. . Class III -minimum length and thickness -border usually ends 23mm below the mylohyoid bridge. class III.• Neil classified lateral throat form as class I. class II. -thickness not more than 2mm . Class I -Long and wide flanged -Thickness vary from 23mm Class II -half as long and narrow as class I and about as long as classIII . which supports the retromylohyoid curtain. • The patient is asked to close the mouth as the dentist applies the downward force on the impression tray. • This action activates the superior constrictor muscle. .Recording retromylohyoid fossa • The distal end of the lingual flange is moulded by asking the patient to protude the tounge. This records any effect that the contraction of medial pterygoid muscle on retromolar curtain. • These flanges present favourable inclined planes to the tongue resulting in vectors of force that help to maintain the mandibular denture in place.CLINICAL SIGNIFICANCE • Border seal. . • The retromylohyiod extension has a stabilizing effect on complete mandibular dentures.5(1): 34-8 . The influence of the retro mylohyoid extension on mandibular complete denture stabiity. 1992 jan-feb. Int J Prosthodont. .zarb-bolender.12th edition. • Impressions for complete dentures.References • Prosthodontic treatment for edentulous patients. Bernard Levin.