Border Moulding Flashcards
What is border moulding?
The shaping of the border area of an impression tray by functional or manual manipulation of the tissues adjacent to the borders to duplicate the contour and size of the vestibule or determining the extension of a prosthesis by using tissue function or manipulation of the tissues to shape the border area of an impression material.
Objective of border moulding?
- Determining the extension of a prosthesis by using tissue function or manual manipulation of the tissue to shape.
- The shaping of impression material along the border areas of the impression tray by functional or manual manipulation of the soft tissue adjacent to the borders to duplicate the contour and size of the vestibule.
Synonym of border moulding.
- muscle trimming
- peripheral tracing
Philosophy of order moulding
- Oral environment surrounded by muscles which are active when we speak, chew, smile, swallow, or perform any of the numerous daily oral function. The muscle can have s destabilising effect on the denture. Border moulding shapes the impression borders and allows the muscles to function in harmony with the denture border.
- the main philosophy behind the tedious border moulding is to confirm the form of the denture border to fit within the physiologiclimits of vestibules. This adequate fit of the denture border enhance the stability, provide retention and provide comfort.
- In addition border moulding also improves the border seal of the denture. An intimate border contact does not allow the air and food particles between the intaglio surface of prosthesis and mucosa.
Anatomy and physiologic consideration in border moulding procedure ?
- Muscles of mastication
- Muscles of facial expression
- Tongue muscles
- Muscles of soft palate
- Pharyngeal muscles
What are the muscles of mastication?
- Masseter
- Medial pterygoid
- Lateral pterygoid
- Temporalis
Significant of muscles of mastication in denture?
They are directly or indirectly dislodge the prosthesis.
Distobuccal border is signified by?
Messetric notch
Objectives in impression making
- Preservation of alveolar ridge
- Retention
- Stability
- Support
- Esthetics
Theories of impression making?
- Based on the amount pressure used
- Open and closed mouth
- Hand manipulation or functional movement
- Type of tray
What records the distolingual extension of the mandible?
Medial pterygoid
One most important characteristics of muscles of facial expression?
No bony attachment
What are important muscles of facial expression that are significant in border molding?
- levator labii superioris
- mentalis
- buccinator
- levator anguli oris
- orbicularis oris
Actions of levator labii superioris?
Lift the upper lip and dilate the nostril
Action of mentalis?
Elevates and protrudes lower lip as it wrinkles skin on chin
