Lecture 1- Class intro and articulators

Question 1

what are the concerns about amalgam

Answer 1

-poor esthetics
- weakening of tooth from removal of tooth structure
-recurrent caries
-no adhesive bonding
-sensitivity of properties to manipulation
-brittle
-biocompatibility
-wastewater pollution

Question 2

what are the advantages and disadvantages to composite

Answer 2

-advantages: aesthetics, bonding strengthens tooth struture, can be more conservative in tooth prep, less expensive than ceramic, reduced mercury
-disadvantages: composite shrinkage and secondary caries, durability, chipping of tooth, more skill and training required, need to keep working area dry, time and expense

Question 3

what does bonding allow

Answer 3

the dentist to use dental composite to change shape, color, or contours

Question 4

what is the oldest type of filling material available

Answer 4

gold foil

Question 5

does gold foil last long

Answer 5

yes can last the lifetime of the patient

Question 6

what materials can be used in crowns

Answer 6

• cast gold
• porcelain fused to metal
• high strength ceramics

Question 7

what are issues with gold crowns

Answer 7

expensive and aesthetics

Question 8

what is the success rates of PFM crowns

Answer 8

• 95% at 5-10 years
  -97.5% at 7 years
• 95.5% at 7 years

Question 9

what are the options for tooth replacements

Answer 9

-complete dentures
-partial dentures
-fixed bridges and single teeth

Question 10

what are the advantages to high strength ceramics

Answer 10

• broad range of indications
  -excellent clinical performance
  -accepted metal alternative
  -less tooth reduction required
• thinner coping thickness
  -shaded coping options offer improved esthetics

Question 11

what are articulators

Answer 11

a mechanical device that stimulates mandibular movements of condyles in their fossae

Question 12

what are the uses of the articulator

Answer 12

-diagnosis
- treatment planning
-communicate with patients/patient education
-fabrication of prosthesis/restorations

Question 13

what do non adjustable or hinge articulators do and what can they be used for

Answer 13

they allow for opening and closing movements
-can be used for single posterior restorations

Question 14

what movements do semi-adjustable articulators do

Answer 14

-opening and closing
-excursive
-protrusive

Question 15

what are the types of semi-adjustable articulators and where is the condyle located in each

Answer 15

-arcon: condyles in lower member, inclination in the upper member
-non arcon: condyles on upper member, inclination on the lower member

Question 16

what type of articulator is ours

Answer 16

arcon

Question 17

what is the purpose of the facebow

Answer 17

-orient the maxillary cast to the rotational axis in three planes

Question 18

the face bow orients the dental cast in the same relationship to the ______ of the articulator

Answer 18

opening axis

Question 19

what are the anatomic references in face bow

Answer 19

mandibular condyles, transverse horizontal axis and one other selected anterior point

Question 20

what does the kinematic facebow locate

Answer 20

true transverse horizontal axis of rotation

Question 21

what does the arbitrary facebow locate

Answer 21

the axis by using anatomical landmarks- utilizes average measurements to approximately locate the axis of rotation

Question 22

what is the transverse horizontal axis ( or terminal hinge axis)

Answer 22

imaginary axis which passes through each of the mandibular condyles
-around this axis is where the pure rotational movement of the mandible occurs

Question 23

where is the transverse horizontal axis located

Answer 23

about 8 mm under the soft tissues in front of the tragus

Question 24

where is the bergstrom point

Answer 24

a point 10 mm anterior to the center of a spherical insert in the auditory meatus and 7 mm below the frankfort horizontal plane

Question 25

where should the 3 points of reference be

Answer 25

two on each side of the face and one on the anterior face

Question 26

what should the anterior reference point be

Answer 26

repeatable and reproducible

Question 27

what can the 3rd points of reference be

Answer 27

-orbitale- lowest point on the infraorbital rim (spring bow)
- nasion (whip mix)
- maxillary incisor incisal edge (denar)
- lower edge of the nostril (older hanau models)

Question 28

when do you use a facebow

Answer 28

-when cusp teeth are present
-interocclusal records are made at an increased occlusal vertical dimension
- the occlusal vertical dimension is subject to change and alteration in occlusal surfaces are necessary