arrangement and setting teeth on the articulator
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source of information mainly from this book, Fenn, Liddelow, and Gimsons' Clinical Dental Prosthetics
arrangement and setting teeth on the articulator
- 5. To provide retention and stability of the denture . To carry and support the teeth . To present the mucosa and gums (coverage of all anatomical landmarks) Assists teeth in supporting the lips and cheeks . To provide comfortable and atraumatic occlusion . Mastication : To assist in preparing food and deglutition. Aesthetic: To achieve pleasing and natural appearance . Speech.
- 7. Molding (adding) + Carving of the supporting wax . Setting-up teeth not to be confused with waxing-up.
- 8. The position of teeth registering the jaw relation (clinical step) then mounting the casts on articulator (laboratory step) Mounting: a laboratory procedure of attaching he maxillary and or the mandibular casts to an articulator . Articulator: is a mechanical device that represents the tempro-mandibular joints and jaws , to which max and man casts may be attached to stimulate some or all man movements .
- 11. Selection of articulator If more control of the occlusion is desired (completely reorganization), a fully adjustable three-dimensional articulator is of value. For C.D patient , simple hinge articulator is suitable( not complicated) but semi-adjustable is better .
- 12. Relationship between natural teeth and supporting bone in Dentate patient : - crowns and roots of all teeth are situated over centers of alveolar ridges . - In mandible , alveolar ridge inclined labially (anteriorly) . *Alveolar ridge supporting molar teeth is in the lingual aspect of basal bone or body of mandible. *Alveolar ridge supporting premolar teeth over the basal bone. *Alveolar ridge supporting anterior teeth labial to the basal bone. The Relationship of the teeth to the casts
- 14. In maxilla , alveolar process is placed in the external + inferior of the maxilla and also inclined labially or anteriorly
- 17. After teeth lost and bone loss(bone resorption) residual alveolar ridgealveolar ridge
- 19. Maxilla Mandible Bone loss Bone loss primarily occurs from Labial and buccal surfaces. Bone loss occurs from both lingual and Buccal sides and more labial surface in incisor region . Direction of resorption In upward , inward and become narrower. In downward , outward and become wider Position or inclination of the residual ridge 悋 惺愕 惘悋忰 (dentate Alveolar ridge) Incline more palatally all around (惡惶愃惘 惺愆悋) Incline slightly more buccally in molar region and more lingually in incisor region
- 20. The same happens in posterior teeth of maxillary denture (placed forwards and inferiorly). (in front of the residual alveolar ridge)
- 21. Anterior teeth of the mandibular denture placed forwards(in front of the residual alveolar ridge) and upward. Continue . . .
- 22. over theof the mandibular denture placedposterior teeth of the residual alveolar ridge.center cramping ofand causereduce the tongue spaceIt will-1 the tongue . not to buccal or lingualdownwardresorption directed-2 denture base is abledirection as in anterior teeth and the .the resorption in this regionenough to replace
- 23. ( means that theposterior cross bite-3 lower posterior teeth overlap the upper posterior teeth)
- 24. Teeth are placed one by one in their :- If each tooth not positioned and angled correctly The denture will be and and
- 26. 悋悋惆悸 悋愕悋惆悋惠 悋忰惴悸 mesio-distal inclination = in front view labio-lingual inclination = viewed from the side
- 34. Its long axis parallel to the vertical axis.
- 36. 悋惺悸 悋悖悋悸 悋悖愕悋 惶悸 惡 悋惘悸(惡愆 悽惠惶惘) Parallel to the vertical axis .
- 42. (more than the central)
- 70. teeth remain in contact = (balanced articulation) If posterior teeth set to an anteroposterior curve and the mandible protrude
- 71. Medio-lateral curve not antero-posterior curve .It is a curve , in the bucco-lingual direction, with the buccal surfaces of the lower posterior teeth higher than the lingual. Significance:- That is incorporated in complete denture to allow for maximum occlusal contact of teeth in lateral movements
- 72. Occlusal surfaces of upper molar facing .
- 75. 1- The side to which the mandible is moving is called Working Side . 2- The balancing side/non working side/orbiting side is the side that opposite to the working side . 3-The condyle on the working side is called working or rotating condyle( it rotates around the vertical axis and then shift in latero- posterior direction making the Bennetts movement). 4-The non working condyle is called the balancing/orbiting condyle( it moves forward downward and medially). Bennetts movement Working / rotating condyle Bennett angel Non-working condyle
- 76. As we know When the mandible moved laterally the rotating condyle on the working side remains in the glenoid fossa and moves very slightly outwards and backwards (Bannet movement). The orbiting condyle(non-working side) travels downwards and forwards .
- 79. 3- each tooth occludes with two teeth in he opposing jaw except :- -upper second molar -lower central incisor