Lec 3

Question 1

1- Mounting the maxillary cast using face bow
2- Jaw Relationship Records for mounting the mandibular cast
Q/ what are the Materials and Methods for Recording Centric Relation

Answer 1

• (1) wax
• (2) Modeling plastic = Zinc oxide egenuol
• (3) Quick-setting impression plaster
• (4) Metallic oxide bite registration paste = zinc oxide e
• (6) Silicone bite registration materials.

Question 2

Disadvantages of Acrylic denture base

Answer 2

§ Should rest on a large area for adequate stress distribution.
§ Low strength, so it is made more thick and bulky to withstand the occlusal forces
*the amount of space available for the placement of artificial teeth is reduced.
§ This becomes more problematic in cases with reduced inter-arch distance.
§ May break on usage
§ Distort by the release of internal strains
§ Low abrasion resistance,
§ Porous and effect on hygiene
§ Less accurate fitness and high dimensional changes.
§ Low thermal conductivity &Less stimulation of underling tissues

Question 3

Advantages of acrylic denture base

Answer 3

§ Low specific gravity.
§ Ease of relining/repair.
§ Low cost. § Ease of fabrication.
§ Good aesthetics
1.Anterior teeth can be replaced at their original position (esthetic level) even in cases with residual ridge resorption.
2.Restores the contour of the edentulous ridge. 3.Brings out the normal contours of the lips and cheeks.