MUSCLE/ LIMITING? STRESS BEARING? RELIEF? QUIZ K MUNA

modiolus

The term literally means "the nave of a wheel" and refers to the point lateral to the angle of the mouth where several facial muscles converge.

buccinator

This contracts, pulling the mouth corner laterally. The muscle gradually contracts as the mouth closes and relaxes as the mouth opens. These actions maintain cheek tension, which protects the buccal mucosa.

mentalis

This muscle raises the skin of the chin, elevates, everts (turns outward), and protrudes the lower lip. These movements contribute to the formation of the facial expressions of doubt and contempt, which is why the mentalis is known as the "pouting muscle".

INCISIVE LABII SUPERIORUS

This muscle runs lateral to the nose and primarily elevates the upper lip (see image: Eye Levator Labii Superioris Muscle). The LLS can also produce facial expressions of disgust, sadness, and disdain.

DEPRESSOR LABII INFERIORIS MUSCLE

the lower lip's main tractor, pulling it inferomedially along with the labial part of platysma.

ORBICULARIS ORIS

causes the lips to close, protrude, and compress. Performing these actions, the orbicularis oris facilitates speech and aids in the production of various facial expressions such as anger, sadness, and others.

Maxi Limiting structures:

A. Labial frenum

B. Labial vestibule

C. Buccal frenum

D. Buccal vestibule

E. Hamular notch (pterygo-maxillary notch)

F. Posterior palatal seal area

Hamular notch (pterygo-maxillary notch)

Limiting Structure (Mx)

Posterior palatal seal area

Limiting Structure (Mx)

Labial frenum, Labial Vestibule, Buccal Frenum, Buccal Vestibule

Limiting structure

Primary stress bearing area (mx)

A. The horizontal portion of the hard palate lateral to the midline (Palatine vault).

B. Postero-lateral portion of the residual alveolar ridge

Secondary stress bearing area (mx)

A. Maxillary tuberosity

B. Rugae area

Relief areas

A. Incisive foramen and papilla.

B.Canine eminence (Cuspid eminence) .

C. Zygomatic process (Malar bone).

D. Mid-palatine raphe.

E. Fovea Palatina.

F. Torus palatinus.

Incisive foramen and papilla.

Relief (Mx)

Canine Eminence

Relief (Mx)

Zygomatic Process (malar bone)

Relif (mx)

Mid-Palatine Raphe

Relief

Fovea Palatina

relief (Mx)

Torus palatinus

Relief (mx)

❑ IDEAL MAXILLARY RIDGE

❑ Abundant keratinized attached tissue ❑ Square arch

❑ Palate u-shape in cross section

❑ Moderate palatal vault

❑ Absence of undercuts

❑ High frenum attachments

❑ Well-defined hamular notches

MYLHYOID MUSCLES

FORMS THE MUSCULAR FLOOR OF THE MOUTH. ARISES FROM THE MYLOHYOID RIDGE OF MANDIBLE. DETERMINES THE LINGUAL FLANGE EXTENSION OF THE DENTURE

SUPRAHYOID MUSCLES

FUNCTION IN ELEVATION OF THE HYOID BONE AND THE LARYNX AND DEPRESSION OF THE MANDIBLE.

❑ DIGASTRIC

❑ STYLOHYOID

❑ MYLOHYOID

❑ GENIOHYOID

Mandible Relief areas:

A. Mental foramen.

B. Mylohyoid line (internal oblique line).

C. Genial tubercles.

D. Torus mandibularis.

Mental foramen.

Relief area

Mylohyoid line (internal oblique line)

Relief area

Genial tubercle

Relief area

Torus mandibularis

Relief area

Mandi Supporting structures Primary stress bearing areas

A. Buccal shelf area.

B. Residual alveolar ridge.

C. External oblique line.

External oblique line.

Stress bearing

Residual alveolar ridge.

Stress bearing

Buccal shelf area.

Stress bearing

Limiting structures

A. Labial, buccal & lingual frenum

B. Labial & buccal vestibule

C. Alveololingual sulcus

D. Retromolar pad

E. Pterygomandibular raphe

Pterygomandibular raphe

Limiting structure (Md)

Labial, buccal & lingual frenum

Limiting structure (Md)

Labial & buccal vestibule

Limiting structure (Md)

Alveololingual sulcus

Limiting structure (MD)

Retromolar pad

Limiting structure (Md)

IDEAL MANDIBULAR RIDGE

❑ WELL-DEFINED RETROMOLAR PAD

❑ BLUNT MYLOHYOID RIDGE

❑ DEEP RETROMYLOHYOID SPACE

❑ LOW FRENUM ATTACHMENTS

❑ ABSENCE OF UNDERCUTS

❑ ABUNDANT ATTACHED KERATINIZED MUCOSA ❑ ADEQUATE ALVEOLAR HEIGHT