Lecture 1 - Intro and Surveying

Question 1

Definition of a partial denture

Answer 1

prosthesis that replaces one or more teeth, but not all. It is supported by the teeth and/or mucosa. May be fixed (i.e. bridge) or removable

Question 2

Definition of a removable partial denture (RPD)

Answer 2

partial denture that can be removed and replaced in the mouth by the patient

Question 3

Definition of an interim denture. What is its purpose?

Answer 3

Provisional; temporary denture. Esthetics, mastication, occlusal support and convenience. Also to condition the patient to accept the final prosthesis.

Question 4

Definition of Retention

Answer 4

Resistance to removal from the tissues or teeth

Question 5

Definition of stability

Answer 5

Resistance to movement in a horizontal direction

Question 6

Definition of support

Answer 6

Resistance to movement towards the tissues or teeth

Question 7

Definition of abutment

Answer 7

Tooth that supports a partial denture

Question 8

Definition of a retainer

Answer 8

component of a partial denture that provides both retention and support for the partial denture

Question 9

4 Objectives of an RPD design

Answer 9

1. preserve remaining teeth and supporting structures 2. restore esthetics and phonetics 3. restore and/or improve mastication 4. restore health, comfort and quality of life

Question 10

What do we call a non-treatment alternative to an RPD?

Answer 10

SDA - shortened dental arch

Question 11

What are the minimum requirements for acceptable function in a SDA (2 options)

Answer 11

1. symmetric loss - requires anterior teeth AND 4 occlusal units 2. asymmetric loss - requires 6 occlusal units

Question 12

What are occlusal units?

Answer 12

opposing premolar = 1 unit opposing molar = 2 units

Question 13

What are 8 indications for RPD’s?

Answer 13

1. lengthy edentulous span (too long for a fixed prosthesis) 2. no posterior abutment for a fixed prosthesis 3. excessive alveolar bone loss 4. poor prognosis for complete dentures due to residual ridge morphology 5. reduced periodontal support for abutments 6. cross-arch stabilizaiton 7. need for immediate replacement of extracted teeth 8. cost/patient desire considerations

Question 14

What are the 7 components of a RPD?

Answer 14

Major connector Minor connector Rests Direct retainers indirect retainers reciprocal or bracing components Denture bases

Question 15

What is a major connector?

Answer 15

connects the parts of a RPD from one side to the other side. principal function is to provide unification and rigidity to the denture

Question 16

What is a minor connector?

Answer 16

connects other components to the major connector. principal function is to provide unification and rigidity to the denture

Question 17

What is a direct retainer? What are the 4 elements that make up a direct retainer?

Answer 17

Also called a clasp or clasp unit. provides retention against dislodging forces. 1. rest 2. retentive arm 3. reciprocal arm 4. minor connector

Question 18

What is an indirect retainer?

Answer 18

Unit of a class 1 or 2 partial denture that resists movement or rotation of denture base away from the residual ridge. Usually composed of a single component, a rest.

Question 19

What is a denture base?

Answer 19

covers the residual ridges and supports the denture teeth

Question 20

What is a Kennedy class 1 and class 2 partial denture?

Answer 20

Class 1 - bilateral edentulous areas that are posterior to all remaining teeth Class 2 - unilateral edentulous area located posterior to all remaining teeth

Question 21

What is a kennedy class 3 partial denture?

Answer 21

Class 3 - unilateral edentulous area bounded by anterior and posterior natural teeth

Question 22

What is a kennedy class 4 partial denture?

Answer 22

class 4 - a single, but bilateral (crossing the midline) edentulous area located anterior to remaining teeth

Question 23

What are the 8 Applegate rules for applying the Kennedy classification?

Answer 23

1. classification should follow extraction, not precede 2. If a 3rd molar is missing and not to be replaced, it is not considered in the classification 3. if a 3rd molar is to be used as an abutment, it is considered in the classification 4. If the 2nd molar is missing and not to be replaced, it is not considered in the classification 5. the most posterior edentulous area determines the classification 6. edentulous areas other than those determining the classification are called MODIFICATION SPACES 7. the extend of the modification is not considered, only the number 8. There is no modification space in class 4.

Question 24

5 reasons teeth are lost

Answer 24

1. dental caries 2. perio disease 3. trauma 4. congenital defects 5. iatrogenic reasons

Question 25

What are the 5 possible consequences of partial edentualism?

Answer 25

1. loss of vertical dimension of occlusion 2. opening of proximal contacts 3. uneven adjacent marginal ridges 4. food impaction 5. impaired self-cleansing of teeth

Question 26

What is the PRIMARY PURPOSE of an RPD?

Answer 26

preservation of teeth that remain

Question 27

When is RPD treatment planned and carried out?

Answer 27

Planned BEFORE other dental treamtnet Carried out AFTER other dental treatment

Question 28

What are the 7 conditions for an ideal abutment for an RPD?

Answer 28

1. no perio disease 2. vital tooth 3. no restorations 4. favorable crown/root ratio 5. favorable contours 6. favorable esthetics 7. favorable occlusion

Question 29

What are 2 conditions that would make a tooth a poor abutment?

Answer 29

1. Active perio disease 2. heavily restored tooth

Question 30

When is an RPD design tooth-supported VS. tooth AND tissue supported?

Answer 30

tooth supported - When there is teeth posterior too the edentulous area tooth AND tissue supported - When there is no teeth posterior to the edentulous area

Question 31

What is the function of a dental surveyor?

Answer 31

instrument used to determine the relative parallelism of two or more surfaces of the teeth or other parts of the cast of a dental arch

Question 32

What is the path of insertion?

Answer 32

Path along which a prosthesis is placed intraorally

Question 33

What do we call prepared surfaces on abutments for a parallel path of insertion?

Answer 33

Guiding planes

Question 34

Ideally, how is path of insertion positioned?

Answer 34

Perpendicular to the occlusal plane

Question 35

Specifically, what should guiding planes be prepared for? (3 pts)

Answer 35

1. proximal plates 2. bracing arms 3. rigid portions of retentive clasps

Question 36

What are the 3 sizes for metal gauges on a surveyor?

Answer 36

1. 0.01” 2. 0.02” 3. 0.03”

Question 37

What is the purpose of an analyzing rod (part of surveryor)?

Answer 37

thin straight metal rod used to analyze contours and undercuts.

Question 38

What are the components of this surveryor?

Answer 38

A - Surverying platform

B - Vertical upright column

C - Cross arm with spindle housing

D - Vertical spindle with tool holder; E - Screw to lock the spindle; F - Tool adapter holder; G - Surveying tool holder; H - Surveying table; J - Model clamp; K - model table lock nut; L - Model rotating ball and socket; M - Ball rotating ring; N - Tool rack; O - Storage compartment; P - Model clamp Lock nut

Question 39

Answer 39

Wax Trimmer

Question 40

What is a wax trimmer?

Answer 40

tool with a straight sharp edge, which parallels the surveying arm. used to contour waxed crowns for partial denture abutments.

Question 41

Difference between Tripod lines and transfer points?

Answer 41

Tripod lines - used to replicate the position of the survey table. placed on soft tissues and used on every cast (not as accurate as transfer points)

Transfer points - Used to replicate the position of the survey table. placed on every cast but used specifically for the final cast. (it is the most accurate because it is placed on hard tissues, which do not change (unlike soft tissues))