Rpd

Question 1

Partial edentulousness

Answer 1

The dental status, when one or more teeth are missing from

the dental arch, but there is at least one tooth/root present.

Question 2

Torque

Answer 2

is moment or moment of force, is the tendency of a force to rotate an object
about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be
thought of as a twist to an object. The torque is the product of the applied force and the
length of the lever. Mathematically, torque is defined as the product of force and the
lever-arm distance, which tends to produce rotation. Loading force x length of loading
arm = resistance force x length of resistance arm.

Question 3

Axis of rotation/ fulcrum line is

Answer 3

a connecting line between the supporting points on
the abutment teeth adjacent to the edentulous ridge around which the denture can
rotate or rock

Question 4

Primary rotation axis

Answer 4

a connecting line between the supporting points on the
abutment teeth adjacent to the edentulous ridge. After inserting the denture it may
become a real or actual rotational axis.

Question 5

Secondary rotation axis

Answer 5

a line between the supporting points of a tooth neighboring

and a tooth non-neighboring the edentulous ridge

Question 6

Real, actual rotation axis

Answer 6

is that primary rotation axis around which the inserted

denture may sink, tilt or rock

Question 7

Fábián-Fejérdy classification class 1A

Answer 7

There can be one or more primary fulcrum
lines, but after the prosthesis is inserted none of these becomes an actual rotational
axis, torque does not arise on the axis of rotation, and the prosthesis doesn’t sink in
any direction. Dental support is possible.

Question 8

Fábián-Fejérdy classification class 1B

Answer 8

There can be one or more primary fulcrum
lines from which one can become a real axis of rotation after the prosthesis is inserted.
The moment of rotation is small, so the sinking of the tooth supported denture can be
compensated for. There is a torque, but it can be compensated for, if we use more
abutments for the anchorage. Fix prosthesis can be made

Question 9

Fábián-Fejérdy classification class 2A

Answer 9

There can be only one primary fulcrum line,
but one or more secondary fulcrum lines. After inserting the denture, the primary axis
of rotation may turn in an actual axis of rotation, and the denture rotating around this
axis may sink in one direction. Tooth and mucosa support. The remaining teeth or the
edentulous ridge is in one block. A removable partial denture can be made

Question 10

Fábián-Fejérdy classification class 2A/1

Answer 10

There is only one fulcrum line, and this
primary fulcrum line becomes a real axis of rotation after the denture is inserted, the
denture rotating around this axis, may sink in one direction. Mucosa and tooth
supported. Long edentulous ridge, subtotal edentulousness. A removable partial
denture can be made.

Question 11

Fábián-Fejérdy classification class 2B

Answer 11

There can be two or more primary fulcrum
lines, from which one may become a real axis of rotation after the denture is inserted.
The denture rotating around this axis may sink in one direction. The remaining teeth
aren’t situated in one block, combination of free end saddle and short span ridges. A
removable partial denture can be made.

Question 12

Fábián-Fejérdy classification class 3

Answer 12

There can be one or more primary fulcrum
lines from which one or more may become a real axis of rotation after the denture is
inserted, the denture rotating around them can sink in two directions, and it may rock. Mucosa and tooth supported. Very long edentulous ridges, teeth are situated diagonal.
A removable partial denture can be made.

Question 13

Removable partial denture definition

Answer 13

: It is a dental device that restores one or more,
but not all the natural teeth and associated structures, its retention and support are
provided by the natural teeth (dental implants) and/or mucosa (and under it the bone).
It occupies more space in the mouth then the teeth, the mucosa and the edentulous
ridge are also covered, it is connected to the natural teeth, and the patient himself can
remove and insert it.

Question 14

. Support of the prosthesis

Answer 14

The transmission of vertical components of chewing force
to the tissues of the mouth, and the resistance of these tissues to this force. With other
words: The foundation on which the denture rests, and which resists displacement
towards the tissues. It comprises the hard and soft tissues that bear the loads of
mastication and clenching applied to the denture.

Question 15

Dental, periodontal support

Answer 15

is, when the vertical components of masticatory force

are transmitted only to the tooth/periodontium

Question 16

Mucosal support

Answer 16

is, when the vertical components of masticatory force are

transmitted only to the mucosal bony basement

Question 17

Mixed, dento-mucosal or muco-dental support

Answer 17

In this case the teeth and the
mucosa-bone base take part together in the support and retention of the RPD. When
the number and/or position of the remaining teeth doesn’t allow dental support, the
vertical components of the masticatory force are transmitted to the teeth and the
mucosal bony base (also the hard palate in the upper jaw).

Question 18

Retention of the RPD

Answer 18

Means the fixation of the RPD against the forces that would
provoke the dislodgement, or lift of the prosthesis from its place. Retention is that
property of a denture which resists the outward displacement of the denture, away
from the tissues

Question 19

Rigid retainer

Answer 19

Means that the load affecting the denture is transmitted to the abutment
tooth in the same size, because the connection between the saddle and the retainer is
stiff, there is no movement of the denture independent from the abutment tooth. The
denture can move neither in vertical, horizontal, nor in sagittal direction. Forces from
any direction affecting the denture reach the abutment teeth immediately. Retention
acts at the moment of load. There is no force transmission to the abutment tooth
without chewing; it is the appropriate retention form

Question 20

Elastic retainer

Answer 20

In this case a decreased load is transmitted to the abutment teeth,
because the connection between the saddle and the abutment teeth is elastic/non rigid
(drought wire clasp), the partial denture can move/dislodge independent from the
abutment tooth. The fixation is not activated immediately at the time of the load

Question 21

Clasp line, line of support

Answer 21

a line connecting two occlusal rests of the RPD in an arch

segment)

Question 22

Load line

Answer 22

connects the centric stops in an arch segment. It should be orally from the
line of support to avoid the generation of lifting forces on the prosthesis

Question 23

Area/poligon of support

Answer 23

The area that is bounded by the occlusal rests, or the area
determined by the lines of support. Line of support connects the occlusal rests of an
arch segment. The polygon of support connects all lines of support. The supporting
area must be as big as possible.

Question 24

Area of load

Answer 24

The edentulous ridge outside of the supporting area. The smaller the
loading area is the more stable the RPD is

Question 25

. Lever/loading arm

Answer 25

is equal to the distance connecting a possible axis of rotation and
a point of loading. The distance between the impact point of the loading force and the
axis of the rotation; the length of the line segment mounted perpendicular on the rotational axis (and) starting from the loading point. Or: the distance between the
occlusal contact point of furthest artificial tooth from the axis and the rotation axis.

Question 26

Resistance arm

Answer 26

the distance between the furthest clasp tip of the retentive arm and
the rotational axis. The length of the line segment mounted perpendicular on the
rotational axis starting from the furthest clasp finger.

Question 27

Direct retainers

Answer 27

are those elements of a removable partial denture which serve to
provide resistance to bodily translation of the denture away from the supportive
tissues, when it is subject to the action of gravity or occlusal forces. They are anchored
on the teeth or other fixed appliances (crown, bridge, ball retention). These are: clasps,
and precision attachments.

Question 28

Indirect retainers

Answer 28

are those elements of a partial denture which provide resistance to the
rotation of the denture around the fulcrum axis. They may be the same elements as direct
retainers placed on the opposite side of the fulcrum axis to that on which the displacing
saddle is situated.

Question 29

Support remote from the saddle

Answer 29

: the occlusal rest is on the remote side of the abutment

tooth, or on the second tooth from the saddle

Question 30

Support adjacent to the saddle

Answer 30

the occlusal rest is close to the saddle on the abutment

tooth near the edentulous saddle