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CONCEPTS OF RPICONCEPTS OF RPI
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com
www.indiandentalacademy.com
INTRODUCTION
www.indiandentalacademy.com
 RPI is a modified I-bar retainer system.
 It was devised by Krol in 1973.
 All the components of the I-bar assembly were
modified significantly to fulfill Krol’s design.
www.indiandentalacademy.com
 Principle of Krol’s design was
 “stress control with minimal tooth and gingival
coverage”
His concept is intended to minimize plaque
accumulations that may endanger the health of teeth
and their vesting structures.
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RR - REST
PP - PROXIMAL PLATE
II - I-BAR
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MODIFICATION OF EACH COMPONENT
OF THE I-BAR RETAINER REQUIRED TO
FORM A RPI SYSTEM
†Mesial rest modification
†Proximal plate modification
- Modification I
- Modification II
- Modification II
†I-bar modification
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Mesial rest preparationMesial rest preparation:
In molars the mesial rest extends only into
triangular fossa.
The canine rests are circular, concave depressions
prepared on the mesial marginal ridge. It does not
cover the entire marginal ridge.
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Proximal plate modifications:Proximal plate modifications:
 One of the major disadvantages of the I-bar
denture was the excessive tooth contact produced
by the extra long proximal plate.
 Krol introduced three modifications to the
proximal plate. They are
- Design modification I
- Design modification II
- Design modification III
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 Design modification I ::
The proximal plate is
designed to extend along the
entire length of the proximal
surface of the abutment with
a minimum tissue relief.
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 Bar clasp assembly in which
guiding plane (GP) and proximal
plate (PP) extend entire length of
proximal tooth surface.
 Physiologic relief is required to
prevent impingement of gingival
tissues during function.
 Extending proximal plate to
contact greater surface area of
guide plane direct functional
forces in horizontal direction, thus
tooth (teeth) are loaded more than
edentulous ridge
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 Design modification II :Design modification II :
 The proximal plate is
designed to extend from the
marginal ridge to the junction
between the middle and
cervical third of the tooth.
 Where as in I-bar retainer the
proximal plate extends about
2mm across the tooth tissue
junction.
www.indiandentalacademy.com
 Bar clasp assembly in which
guiding plane (GP) and
proximal plate (PP) Extends
from marginal ridge to
junction of middle and
gingival thirds of proximal
tooth surface.
 The decrease in amount of
surface area contact of
proximal plate on guiding
plane more evenly
distributes functional force
between tooth and
edentulous ridge.
www.indiandentalacademy.com
 Design modificationDesign modification
III :III :
 † The proximal plate is
designed to contact just
about 1mm of the gingival
third of the guiding plane of
the abutment tooth.
 † The purpose of reducing
the length of the proximal
plate is to improve the
gingival health. www.indiandentalacademy.com
 Bar clasp assembly in which
proximal plate (PP) contacts
approximately 1 mm of gingival
portion of guiding plane (GP).
 During function, proximal plate
and I – bar clasp arm are
designed to move in
mesiogingival direction,
disengaging tooth. Lack of
sustained contact between
proximal plate and guiding
plane distributes more
functional force to edentulous
ridge
www.indiandentalacademy.com
I-bar modification:I-bar modification:
† The tip of the I-bar is
modified to have a pod shape
in order to allow more tooth
contact.
† It is placed more mesially so
that it shifts towards the
mesial embrassure space
under occlusal load and
increases reciprocation.
† The I-bar is designed to
compensate for the decreased
encirclement, {tooth contact},
provided by the proximal
plate and mesial rest.
www.indiandentalacademy.com
ADVANTAGES :
 Minimal tooth coverage.
 Hence these dentures are easy to maintain
www.indiandentalacademy.com
RPARPA System
R - Rest
P - Proximal Plate
A -Aker’s clasp
www.indiandentalacademy.com
R P AR P A
 This is a modification of the
RPI retainer, again devised by
Krol in 1976.
 The I-bar in the RPI system
could not be used for patients
with soft tissue undercuts and
high frenal attachments.
 In such cases the I-bar of the
RPI retainer is replaced with
an Aker’s {circumferential}
clasp to form the RPA
retainer.
Frontal view
Occlusal viewwww.indiandentalacademy.com
Advantages :
 Easier to grasp for removal of prosthesis .
 It can be used in case of large tissue
undercuts, high frenum etc.
 Indicated when bar clasp is contraindicated
and desirable undercuts is located in gingival
3rd of tooth away from distal extension area.
www.indiandentalacademy.com
 Successful use of the system requires
careful analysis of each component for
the function that it provides and
thoughtful execution of the system in
the abutment preparation.
www.indiandentalacademy.com
 Mc Cracken’s Removable partial denture prosthodontics. 11th edition,
2004.
 Stewart, Rudd and Kuebker – Clinical Removable partial prosthodontics-
third edition
 Stewart, Rudd and Kuebker: Clinical Removable denture prosthodontics.
2nd edition, 2001.
 Davenport, Basker and Heath :A color atlas of removable partial dentures,
1st edition, 1980.
 McCrackens ,Removable partial prosthodontics, 8th edition.  
www.indiandentalacademy.com
THANK YOUTHANK YOU
For more details please visit
www.indiandentalacademy.com
www.indiandentalacademy.com

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Concepts of rpi/ dentistry dental implants

  • 1. CONCEPTS OF RPICONCEPTS OF RPI INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 3.  RPI is a modified I-bar retainer system.  It was devised by Krol in 1973.  All the components of the I-bar assembly were modified significantly to fulfill Krol’s design. www.indiandentalacademy.com
  • 4.  Principle of Krol’s design was  “stress control with minimal tooth and gingival coverage” His concept is intended to minimize plaque accumulations that may endanger the health of teeth and their vesting structures. www.indiandentalacademy.com
  • 5. RR - REST PP - PROXIMAL PLATE II - I-BAR www.indiandentalacademy.com
  • 6. MODIFICATION OF EACH COMPONENT OF THE I-BAR RETAINER REQUIRED TO FORM A RPI SYSTEM †Mesial rest modification †Proximal plate modification - Modification I - Modification II - Modification II †I-bar modification www.indiandentalacademy.com
  • 7. Mesial rest preparationMesial rest preparation: In molars the mesial rest extends only into triangular fossa. The canine rests are circular, concave depressions prepared on the mesial marginal ridge. It does not cover the entire marginal ridge. www.indiandentalacademy.com
  • 8. Proximal plate modifications:Proximal plate modifications:  One of the major disadvantages of the I-bar denture was the excessive tooth contact produced by the extra long proximal plate.  Krol introduced three modifications to the proximal plate. They are - Design modification I - Design modification II - Design modification III www.indiandentalacademy.com
  • 9.  Design modification I :: The proximal plate is designed to extend along the entire length of the proximal surface of the abutment with a minimum tissue relief. www.indiandentalacademy.com
  • 10.  Bar clasp assembly in which guiding plane (GP) and proximal plate (PP) extend entire length of proximal tooth surface.  Physiologic relief is required to prevent impingement of gingival tissues during function.  Extending proximal plate to contact greater surface area of guide plane direct functional forces in horizontal direction, thus tooth (teeth) are loaded more than edentulous ridge www.indiandentalacademy.com
  • 11.  Design modification II :Design modification II :  The proximal plate is designed to extend from the marginal ridge to the junction between the middle and cervical third of the tooth.  Where as in I-bar retainer the proximal plate extends about 2mm across the tooth tissue junction. www.indiandentalacademy.com
  • 12.  Bar clasp assembly in which guiding plane (GP) and proximal plate (PP) Extends from marginal ridge to junction of middle and gingival thirds of proximal tooth surface.  The decrease in amount of surface area contact of proximal plate on guiding plane more evenly distributes functional force between tooth and edentulous ridge. www.indiandentalacademy.com
  • 13.  Design modificationDesign modification III :III :  † The proximal plate is designed to contact just about 1mm of the gingival third of the guiding plane of the abutment tooth.  † The purpose of reducing the length of the proximal plate is to improve the gingival health. www.indiandentalacademy.com
  • 14.  Bar clasp assembly in which proximal plate (PP) contacts approximately 1 mm of gingival portion of guiding plane (GP).  During function, proximal plate and I – bar clasp arm are designed to move in mesiogingival direction, disengaging tooth. Lack of sustained contact between proximal plate and guiding plane distributes more functional force to edentulous ridge www.indiandentalacademy.com
  • 15. I-bar modification:I-bar modification: † The tip of the I-bar is modified to have a pod shape in order to allow more tooth contact. † It is placed more mesially so that it shifts towards the mesial embrassure space under occlusal load and increases reciprocation. † The I-bar is designed to compensate for the decreased encirclement, {tooth contact}, provided by the proximal plate and mesial rest. www.indiandentalacademy.com
  • 16. ADVANTAGES :  Minimal tooth coverage.  Hence these dentures are easy to maintain www.indiandentalacademy.com
  • 17. RPARPA System R - Rest P - Proximal Plate A -Aker’s clasp www.indiandentalacademy.com
  • 18. R P AR P A  This is a modification of the RPI retainer, again devised by Krol in 1976.  The I-bar in the RPI system could not be used for patients with soft tissue undercuts and high frenal attachments.  In such cases the I-bar of the RPI retainer is replaced with an Aker’s {circumferential} clasp to form the RPA retainer. Frontal view Occlusal viewwww.indiandentalacademy.com
  • 19. Advantages :  Easier to grasp for removal of prosthesis .  It can be used in case of large tissue undercuts, high frenum etc.  Indicated when bar clasp is contraindicated and desirable undercuts is located in gingival 3rd of tooth away from distal extension area. www.indiandentalacademy.com
  • 20.  Successful use of the system requires careful analysis of each component for the function that it provides and thoughtful execution of the system in the abutment preparation. www.indiandentalacademy.com
  • 21.  Mc Cracken’s Removable partial denture prosthodontics. 11th edition, 2004.  Stewart, Rudd and Kuebker – Clinical Removable partial prosthodontics- third edition  Stewart, Rudd and Kuebker: Clinical Removable denture prosthodontics. 2nd edition, 2001.  Davenport, Basker and Heath :A color atlas of removable partial dentures, 1st edition, 1980.  McCrackens ,Removable partial prosthodontics, 8th edition.   www.indiandentalacademy.com
  • 22. THANK YOUTHANK YOU For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

Notas do Editor

  1. Direct retainers