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8/22/2019 Anatomy Tour for Prosthodontics

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Anatomy for Complete andPartial Dentures


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Lips

Vermil ion Border

Denture provides lip support Affects vermilion border width


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Lips

Philtrum

Depression below nose


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Lips

Nasolabial Angle

Angle between columella of nose &

philtrum of lip Normally, approximately 90 as viewed in

profile


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Lips

Tissue of the Upper L ip

Loose tissue of the upper lipcan be gathered between your

thumb and index finger


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Cheeks

Masseter Muscle

Closing muscle bulges into distal corner of

buccal vestibule

Not active during impression making


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Residual Ridges

I f r idges are severely resorbed, inform

patient

U-shape

V-shape


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Vestibules

I f vestibules are shallow, inform the patient


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Maxilla

Maxi l lary Tuberosities

Oversized

Resorbed

Undercut


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Maxilla

Maxi l lary Tuberosities Oversized

Resorbed

Undercut


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Maxilla

I ncisive Papil la

Landmark for setting of teeth


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Maxilla

Hamular Notch

Posterior border denture

Between the bony tuberosity and hamulus

Soft displaceable tissue, for comfort and

retention


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Maxilla

Hamular Notch Posterior border denture

Sometimes posterior to where the depression in

the soft tissue appears Use the head of your mirror to palpate the

notch & mark with an indelible marker


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Maxilla

Soft PalateVibrating Line

Critical posterior border dentures

Junction of movable and immovable

portions of the soft palate


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Maxilla

Glandular Tissue

Soft displaceable


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Maxilla

Soft Palate Fovea Palatine

Bilateral indentations near midline of the soft

palate Close to the vibrating line


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Maxilla

Hard Palate Median Palatine Raphe (midline palatine

suture)

A bony midline structure

May require relief when covered by a denture


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Maxilla

Torus Palatinus

May require removal


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Mandible

Pear Shaped Pad Soft pad containing glandular tissue

Inverted pear shape, posterior border

Created from scarring after extractions


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Mandible

Buccal Shelf

Primary denture bearing area of mandibular

denture

Between height of bridge & external oblique ridge

Resorbs more slowly


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Mandible

Anter ior Border of the Ramus Do not extend dentures to ramus

Discomfort will result


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Mandible

External Oblique Ridge Do not extend dentures to this ridge


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Mandible

Mylohyoid Ridge Origin of mylohyoid muscle which

influences length of lingual flange

Can be prominent, and/or sharp, requiringrelief


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Mandible

Mylohyoid Ridge


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Mandible

L ingual Tor i

Raised bony structures

May require relief when covered by a

denture

Thin mucosa can ulcerate easily


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Mandible

Genial Tubercles

Attachment for the genioglossus muscle

Tubercles may be higher than the ridge

with severe resorption


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Frena (singular = frenum)

Must be relieved to allow movement, withoutimpingement

If prominent, adequate relief can weaken a denture

If too much relief, retention is lost

Check prominence intraorally


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Pterygo-Mandibular Raphe

Connects from the hamulus to themylohyoid ridge

When prominent, can cause pain, or

loosening

Requires relief groove if prominent


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Retrozygomal Fossae (Space)

Palpate zygomatic process in buccal vestibule justbuccal to first maxillary molar

Vestibular space posterior to zygoma


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Retrozygomal Fossae (Space)

Commonly incompletely captured

in preliminary impressions

Use syringe technique


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Coronoid Process

Place mirror head lateral to tuberosity

Move mandible to opposite side

Note binding or pain This gives some indication of the width of

the space for flange

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