Which muscles form the Reteomylohyoid curtain and its boundries

Retromylohyoid curtain forms the distal end of the alveolingual sulcus. It is a curtain formed by the mucous membrane in the oral cavity. Retromylohyoid curtain bounds the Retromylohyoid fossa.

Location: Retromylohyoid curtain  is situated between the anterior pillar of fauces and pterygomandibular fold

The muscles which form the retromylohyoid curtain are:

  1. Posterio laterally: Superior constrictor muscle
  2. Posterio medially: Palatoglossus muscle and lateral surface of tongue
  3. Inferiorly: Mylohyoid muscle and Submandibular gland

retromylohyoid curtainImportance of Retromylohyoid curtain in prosthodontics:

  • It acts as a limiting structure in forming the lingual flange of mandibular denture.
  • It is pulled forward when the tongue is protruded out making it an important landmark to be considered while fabricating the mandibular complete denture.
  • Distolingual portion of the flange is influenced by glossopalatine and superior constrictor muscles which constitute the Retromylohyoid curtain.
  • The action of the medial pterygoid muscle helps in deciding the posterior border of the denture near the retromylohyoid fossa
  • Retromylohyoid fossa is bounded by the retromylohyoid curtain
  • The posterior border of the denture should touch the retromylohyoid curtain when the tip of the tongue is placed against the central part of the residual alveolar ridge.
  • Contraction of the medial pterygoid muscle causes a bulge in the Retromylohyoid curtain as it medial pterygoid lied behind the superior constrictor

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