PARTIAL COVERAGE
CROWNS - POSTERIORS

www.indiandentalacademy.com
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

www.indiandentalacademy.com
INTRODUCTION

www.indiandentalacademy.com


An extracoronal restoration that covers only part
of the clinical crown considered to be a partial
veneer crown. It can...
DEFINITION


A restoration that restores all but one coronal surface of
a tooth, usually not covering the facial surface....
TYPES OF PARTIAL COVERAGE
CROWNS


For posterior teeth-1)Three-quarter crown
2)Modified three-quarter crown
3)Seven-eight...
INDICATIONS FOR PARTIAL VENEER
CROWNS:


Partial veneer crowns are a conservative measure
and are preferable to the compl...


Teeth with normal anatomic crown form, i.e.,
without excessive cervical constriction.

www.indiandentalacademy.com
CONTRAINDICATIONS FOR PARTIAL
VENEER CROWNS:




High caries rate.
Teeth with extensive restoration
Deep cervical lesio...


Teeth with short clinical crown – difficult to
achieve resistance and retention form.



Thin teeth – preparation of r...
ADVANTAGES OF PARTIAL VENEER
CROWNS:


Partial veneer crowns have several advantages over
complete crowns:



The tooth ...


Complete seating of the casting is more easily
verified.



Complete seating of the casting during
cementation is enha...
DISADVANTAGES OF PARTIAL VENEER
CROWNS:


The partial veneer crown is not as retentive as a
complete veneer crown.



Sk...
Fundamental Principles of Design:
1) To impart strength to the remaining portion of the
tooth crown.
2) To provide maximum...
ROTARY INSTRUMENTS USED FOR TOOTH
PREPARATIONS









Round end tapered diamond,
Torpedo diamond,
Short needle,
...
Steps for preparation of partial veneer crowns


Outline Form



Lingual reduction





Incisal reduction
Lingual axia...
Maxillary posterior three quarter
crowns

www.indiandentalacademy.com
Occlusal reduction


No. 171 or round-end
tapered diamond is used



Depth orientation
grooves are made on the
triangula...


At the occluso-facial line
angle groove is made
only 0.5mm deep to
minimize the display of
metal.



Tooth structure f...
Functional Cusp Bevel




Should be parallel to
the inward facing
inclines of the cusps of
the opposing tooth, at
depth ...
Lingual Axial Reduction






Torpedo diamond
creating a definite
chamfer all over.
Over inclination of
the lingual wal...
Proximal Reduction




Initially thin needle
diamond is used in
sawing motion to just
break the contact with
the adjacen...
Axial Finishing


Torpedo bur is used to
finish the axial walls
and round of the
margins of the
preparation.

www.indiand...
Proximal Groove








Parallel to the incisal two
thirds of the facial surface.
Orientation cut is made using
no.170...
Proximal Flares




Flame diamond and
flame bur is used to
produce the proximal
flares that is a flat
geometric plane.
W...
Occlusal Offset


No. 171 bur used to
create a 1 mm ledge on
the lingual incline of
the facial cusp
connecting the groove...
Facial bevel


Flame diamond is used
to bevel the occlusofacial line angle
keeping it
perpendicular to path
of insertion....
Completed three quarter crown

www.indiandentalacademy.com
Features of the Maxillary Posterior Three
Quarter Crown Preparation

www.indiandentalacademy.com




A common variation of the
three quarter crown
preparation , employed
when caries or previous
restorations are presen...




A less destructive
alternative for augmenting
retention and resistance is
a three quarter crown
preparation utilizin...
Mandibular Posterior Three Quarter
Crown

www.indiandentalacademy.com
Occlusal Reduction








No. 171 or torpedo diamond is
used
Depth orientation grooves are
made on the triangular rid...
Thank you
www.indiandentalacademy.com
Leader in continuing dental education

www.indiandentalacademy.com
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partial veneer crowns /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.


Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078

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partial veneer crowns /certified fixed orthodontic courses by Indian dental academy

  1. 1. PARTIAL COVERAGE CROWNS - POSTERIORS www.indiandentalacademy.com
  2. 2. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  3. 3. INTRODUCTION www.indiandentalacademy.com
  4. 4.  An extracoronal restoration that covers only part of the clinical crown considered to be a partial veneer crown. It can also be referred to as a partial coverage restoration. www.indiandentalacademy.com
  5. 5. DEFINITION  A restoration that restores all but one coronal surface of a tooth, usually not covering the facial surface.(GPT- 8)  A partial veneer crown is a restoration covering two or more surfaces of a tooth (Tylman) www.indiandentalacademy.com
  6. 6. TYPES OF PARTIAL COVERAGE CROWNS  For posterior teeth-1)Three-quarter crown 2)Modified three-quarter crown 3)Seven-eighth crowns 4)proximal half crowns www.indiandentalacademy.com
  7. 7. INDICATIONS FOR PARTIAL VENEER CROWNS:  Partial veneer crowns are a conservative measure and are preferable to the complete veneer restoration.  Intact or minimally restored teeth.  Teeth with crown length that is average or that exceeds the average. www.indiandentalacademy.com
  8. 8.  Teeth with normal anatomic crown form, i.e., without excessive cervical constriction. www.indiandentalacademy.com
  9. 9. CONTRAINDICATIONS FOR PARTIAL VENEER CROWNS:    High caries rate. Teeth with extensive restoration Deep cervical lesion – difficult to establish finish line , if area is sensitive complete coverage crown is indicated. www.indiandentalacademy.com
  10. 10.  Teeth with short clinical crown – difficult to achieve resistance and retention form.  Thin teeth – preparation of retention grooves is difficult.  Poor alignment of teeth in the dental arch. www.indiandentalacademy.com
  11. 11. ADVANTAGES OF PARTIAL VENEER CROWNS:  Partial veneer crowns have several advantages over complete crowns:  The tooth reduction is conservative.  The esthetics surpass the complete veneer cast crown.  Margin accessibility for finishing and cleaning is improved. www.indiandentalacademy.com
  12. 12.  Complete seating of the casting is more easily verified.  Complete seating of the casting during cementation is enhanced by diminished hydraulic pressure.  Electric pulp testing can be conveniently accomplished on the intact enamel surface. www.indiandentalacademy.com
  13. 13. DISADVANTAGES OF PARTIAL VENEER CROWNS:  The partial veneer crown is not as retentive as a complete veneer crown.  Skillful preparation is critical to avoid metal display.  The partial veneer crown preparation is limited to fairly intact teeth with normally shaped crown and an average length clinical crowns www.indiandentalacademy.com
  14. 14. Fundamental Principles of Design: 1) To impart strength to the remaining portion of the tooth crown. 2) To provide maximum resistance and retention form to the finished restoration. 3) To preserve esthetics by conservation of tooth structure, thus limiting the display of gold on buccal and labial surfaces. www.indiandentalacademy.com
  15. 15. ROTARY INSTRUMENTS USED FOR TOOTH PREPARATIONS         Round end tapered diamond, Torpedo diamond, Short needle, Long needle, Flame diamond, Small wheel diamond, Tapered fissure burs End cutting bur www.indiandentalacademy.com
  16. 16. Steps for preparation of partial veneer crowns  Outline Form  Lingual reduction   Incisal reduction Lingual axial reduction Proximal axial reduction Proximal box or groove placement  Occlusal or incisal offset placement  Facial bevel  Finishing the preparation.   www.indiandentalacademy.com
  17. 17. Maxillary posterior three quarter crowns www.indiandentalacademy.com
  18. 18. Occlusal reduction  No. 171 or round-end tapered diamond is used  Depth orientation grooves are made on the triangular ridges and the developmental grooves 1.0mm on the non functional and 1.5mm on the functional cusp www.indiandentalacademy.com
  19. 19.  At the occluso-facial line angle groove is made only 0.5mm deep to minimize the display of metal.  Tooth structure from between the grooves is removed according to cuspal contours www.indiandentalacademy.com
  20. 20. Functional Cusp Bevel   Should be parallel to the inward facing inclines of the cusps of the opposing tooth, at depth of 1.5mm creating 45˚ angle with the axial wall. No. 171 bur www.indiandentalacademy.com
  21. 21. Lingual Axial Reduction    Torpedo diamond creating a definite chamfer all over. Over inclination of the lingual wall frequently occurs. Check at all times for over inclination. www.indiandentalacademy.com
  22. 22. Proximal Reduction   Initially thin needle diamond is used in sawing motion to just break the contact with the adjacent tooth Once contact is broken, torpedo diamond is used to create a definite chamfer finish line and complete the axial and proximal reduction. www.indiandentalacademy.com
  23. 23. Axial Finishing  Torpedo bur is used to finish the axial walls and round of the margins of the preparation. www.indiandentalacademy.com
  24. 24. Proximal Groove     Parallel to the incisal two thirds of the facial surface. Orientation cut is made using no.170 bur depth 1.0mm or less. Groove is continued apically to about 0.5mm above the chamfer finish line. Grooves on mesial and distal side are made parallel to each other. www.indiandentalacademy.com
  25. 25. Proximal Flares   Flame diamond and flame bur is used to produce the proximal flares that is a flat geometric plane. When access is good a medium grit sandpaper disc may be used. www.indiandentalacademy.com
  26. 26. Occlusal Offset  No. 171 bur used to create a 1 mm ledge on the lingual incline of the facial cusp connecting the grooves and assuming an inverted V shape. No.957 end cutting bur is used to define the margins www.indiandentalacademy.com
  27. 27. Facial bevel  Flame diamond is used to bevel the occlusofacial line angle keeping it perpendicular to path of insertion. The bevel should not be more than 0.5mm wide. www.indiandentalacademy.com
  28. 28. Completed three quarter crown www.indiandentalacademy.com
  29. 29. Features of the Maxillary Posterior Three Quarter Crown Preparation www.indiandentalacademy.com
  30. 30.   A common variation of the three quarter crown preparation , employed when caries or previous restorations are present on the proximal surfaces, is one in which boxes are substituted for grooves. However boxes are very destructive of tooth structure, so their use can be justified only when tooth structure has been destroyed by caries www.indiandentalacademy.com
  31. 31.   A less destructive alternative for augmenting retention and resistance is a three quarter crown preparation utilizing two grooves on each proximal surface. There is no significant difference between retention afforded by the four grooves and that available from two boxes. www.indiandentalacademy.com
  32. 32. Mandibular Posterior Three Quarter Crown www.indiandentalacademy.com
  33. 33. Occlusal Reduction     No. 171 or torpedo diamond is used Depth orientation grooves are made on the triangular ridges and the developmental grooves 1.0mm on the non functional and 1.5mm on the functional cusp At the occluso-facial line angle groove is made only 0.5mm deep to minimize the display of metal. Tooth structure from between the grooves is removed according to cuspal contours www.indiandentalacademy.com
  34. 34. Thank you www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

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