Anatomy

By: Wildan Humairah090600020Anatomy

Extra-oral Landmarks

Nasolabial SulcusMento Labial sulcusPhiltrumVermillion borderAngle of the mouthModiolus

Extra-oral Landmarks Nasolabial Angle

Angle between columella of nose & philtrum of lip Normally, approximately 90 as viewed in profile

Extra-oral Landmarks Mento labial Sulcus

Extra-oral Landmarks Mento labial Sulcus

Angle Class IIClass IClass IIIExtra-oral Landmarks Philtrum

Depression below nose

Extra-oral Landmarks Vermillion Border

Denture provides lip support Affects vermilion border width

Extra-oral Landmarks Angle of the mouth (commicure)

Extra-oral Landmarks Modiolus

Intra-oral Landmarks Maxillary Anatomical LandmarksLabial frenumBuccal frenumLabial vestibuleAnterior buccal vestibulePosterior buccal vestibuleRetrozygomatic spaceCoronoid bulgeHamular notchPterygomaxillary notchFovea palatini Vibrating lineResidual alveolar ridgePalatal rugaeIncisive papillaMedian palatine rapheMaxillary tuberosity

Anatomy in Relation to Complete DenturesEdentulous Maxilla Labial frenumFold of mucous membraneDoes not contain muscleLabial notch in denture is narrowBuccal frenumOverlies levator anguli orisMay be moved in an A-Pdirection by the actions of theorbicularis oris and buccinator

Anatomy in Relation to Complete DenturesEdentulous Maxilla Labial vestibuleReflection contains no muscleAnterior buccal vestibuleOverlies buccinator muscle whose fibers are downward and forward and limit the height and thickness of the buccal flangePosterior buccal vestibuleThickness determined by the masseter muscleCoronoid process of the mandible encroaches on the space during lateral excursionsLabial and buccal flanges of the denture must contact movable tissues in order to make a seal

Anatomy in Relation to Complete DenturesEdentulous Maxilla Hamular notchPterygomaxillary notchDoes not contain any muscles or ligaments to interfere with the addition of pressure with a postdamFovea palatini2 small pits representing mucous gland openingsUsually located just posterior to the vibratingline

Anatomy in Relation to Complete DenturesEdentulous MaxillaVibrating lineImaginary line across palateConnects the pterygomaxillary notches

Posterior Palatal SealArea not a lineFunctions: border seal, prevent food impaction beneath, improve retention, compensate for shrinkage of denture resinPressure on displaceable mucosa that covers palatal glandsAnterior border junction between hard and soft palate; blow linePosterior border (vibrating line) junction between movable and immovable soft palate; AH line

Anatomy in Relation to Complete DenturesEdentulous MaxillaDenture bearing areasResidual alveolar ridgeCrest is primary stress bearing areaFibrous CT least displaceable and best able to carry the stress of masticationPalatal rugaeSecondary stress bearing area

Anatomy in Relation to Complete DenturesEdentulous MaxillaIncisive papillaGuards the incisive canalPressure will interfere with the blood and nerve supply causing a burning sensationProvide reliefMedian palatine rapheMaxillary tuberosityDistal to the maxillary third molar, the alveolar process ends in a prominence that is called the maxillary tuberosity

Anatomy in Relation to Complete DenturesEdentulous MandibleLabial frenumBuccal frenumLingual frenumLabial vestibuleBuccal vestibuleResidual alveolar ridgeBuccal shelfRetromolar padPterygomandibular rapheMylohyoid ridgeAlveololingual sulcusRetromylohyoid space

Anatomy in Relation to Complete DenturesEdentulous MandibleLabial frenumFold of mucous membraneDoes not contain muscleBuccal frenumOverlies depressor anguli oris (VII)Movable by the buccinator and orbicularis oris (VII) resulting in a wide notch in the dentureLingual frenumOverlies genioglossus muscle (XII)

Anatomy in Relation to Complete DenturesEdentulous Mandible Labial vestibuleBuccal vestibuleEntire periphery of denture must end in soft tissuesStability of denture must come from the maximum use of all bony foundations where tissues are firmly and closely attached to bone

Anatomy in Relation to Complete DenturesEdentulous MandibleDenture bearing areasResidual alveolar ridgeBuccal shelfBounded laterally by the external oblique ridge and medially by the crest of the ridgeAttachment of buccinator muscle (VII)Buccal flange rests upon buccinator and should extend as far as the tissues permitMasseter muscle (V3) may crowd buccinator forward against the denture causing an indentation at the DB angle

Anatomy in Relation to Complete DenturesEdentulous MandibleRetromolar padContains:Retromolar glandPterygomandibular rapheBuccinator muscleTemporal tendonUnderlying basal bone is resistant to resorptionCoverage will provide some border sealPterygomandibular rapheExtends from the pterygoid hamulus superiorly to the alveolar ridge inferiorly under the retromolar gland

Anatomy in Relation to Complete DenturesEdentulous MandibleMylohyoid ridgeAttachment of mylohyoid muscle (V3) which forms the muscular floor of the mouthFibers are almost horizontal in front of the hyoid where they join those of the opposite side to form a rapheAt the level of the hyoid they pass almost vertically downward to insert into the hyoidAlveololingual sulcusSlopes toward the tongue to permit action of the mylohyoidLength of flange distally compared to anteriorly is greater owing to the changed length and direction of the mylohyoid fibers

Anatomy in Relation to Complete DenturesEdentulous MandibleRetromylohyoid spaceDL extension determined by styloglossus (XII)Posterolateral extension determined by superior pharyngeal constrictor (X) and palatoglossus (X)Overextension may cause pain on swallowing

Border Structure that Limits the Periphery of the Denture Maxillary DentureMandibular dentureLabial frenum.Facial border anatomyLabial vestibuleLabial frenum.Buccal frenumLabial vestibuleBuccal vestibuleBuccal frenumHamular notchBuccal vestibuleVibrating line of the soft palate

Masseter muscle influencing areaRetromolar pad

Border Structure that Limits the Periphery of the Denture Maxillary DentureMandibular dentureLingual border anatomyPalatoglossal arch.Lingual pouchSublingual salivary gland areaLingual frenumLingual border anatomyPalatoglossal arch.

Denture Support Foundation area on which the dental prosthesis rest

Primary stress bearing areasAreas which able to resist the vertical forces of occlusion

Maxillary arch Mandibular archThe crest of the ridgeThe buccal shelf of boneThe flat area of the palateThe crest of the ridge

Secondary stress bearing areasAreas resist the lateral forces of occlusion and can aid the resistance to the vertical forces

Maxillary arch

Mandibular arch

Lateral slopes ofthe palateAnterior ridge.Rugae areaAll ridge slopesLabial & Buccalsurfaces of the ridge

Relief area The portion of the denture is reduced to eliminate excessive presser on specific parts on the denture supporting tissuesMaxillary arch

Mandibular arch

Incisive papillaMedian palatine rapheTorus palatinusSharp bony prominences

Genial tubercleSharp mylohyoid ridgeTorus mandibularisCrest of knife edge ridgeMental foramenSharp bony prominence

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