This document discusses stainless steel crowns, including different types, their objectives and uses, composition, indications, clinical procedure, modifications, and complications. There are three main types of stainless steel crowns - untrimmed, pretrimmed, and precontoured. Stainless steel crowns are used to restore primary and young permanent teeth with extensive decay or other defects. The clinical procedure involves tooth preparation, initial crown adaptation, contouring, crimping, and cementation. Complications can include ledges, crown tilt, or poor margins.
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A crown is a tooth shaped covering which is cemented to the tooth structure & its main function is to protect the tooth structure & retain the function
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
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Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
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2. CONTENTS
Types of crown
Different type of Stainless Steel Crown
Objective of Using
Advantage
Disadvantage
Composition
Indication
Factor s to be considered in Pre-Operative Evaluation
Clinical Procedure
Tooth Preparation
Steps in Reduction
3. Initial Adaptation of Crown
Seating the Crown
Crown Contouring
Crown Crimmping
Checking Final Adaptation of Crown
Finishing and Polishing
Radiographic Confirmation of Gingival Pit
Cementation
Result
Confirm Occlusion
Stainless Steel Crown Modifications
Complications
Reference
4. INTRODUCTION
Stainless steel crown is a semi permanent restoration
used in primary and young permanent teeth.
It was introduced as chrome-steel crown by
‘Humphrey’ in 1950.
Stainless steel crown is more frequently used in
deciduous dentition than permanent dentition .
Stainless steel crown is an efficient and reliable
method of restoration of deciduous dentition.
6. DIFFERENT TYPES OF
STAINLESS STEEL CROWN
1) Untrimmed - These crowns are neither trimmed nor contoured
thus require lot of adaptation and are time consuming.
Eg :- Rocky Mountain.
2) Pretrimmed - These crowns have straight non-contoured
sides but are festooned to line parallel to the gingival crest. They
still require contouring and trimming.
Eg : - Unitek Stainless steel Crowns and 3M Co.
3) Precontoured - These crowns are festooned and are also
precontoured though a minimal amount of festooning and trimming
may be necessary. Eg : - Unitek Stainless steel Crowns and 3M Co.
7. Untrimmed : Neither trimmed nor
contoured
Pretrimmed : Crowns have straight
non-contoured sides.
Precontoured : Crowns are festooned
DIFFERENT TYPES OF STAINLESS
STEEL CROWN
8. OBJECTIVES OF USING
To achieve biologically compatible , competent
for mastication and clinically acceptable
restoration.
To maintain the form and function and where
possible the vitality of the tooth should be
maintained.
9. ADVANTAGES
These crowns are more superior to multisurface amalgam
restoration with respect to life span, replacement , retention and
resistance.
They are acceptable to both patient and dentist
They are more cost effective because of comparatively simple
procedure involved in restoring even severely affected primary
molars
18. FACTORS TO BE CONSIDERED
IN PRE-OPERATIVE
EVALUATION
Dental age of the patient
Co-operation of the patient
Motivation of the patient
Medically compromised/disabled children
19. CLINICAL PROCEDURE
EVALUATE THE PREOPERATIVE OCCLUSION
•Take the alginate impression of U/L jaws.
•Pour the cast with dental stone
•Note the dental midline and the cusp fossa
relationship bilaterally
20. SELECTION OF CROWN
•The correct size crown is selected by the M-D
dimensions of the tooth to be restored using Boley
gauge.
•To produce steel crown margins of similar shape
examine the contour of gingiva of the buccal & lingual
marginal gingiva.
25. INITIAL ADAPTATION OF
CROWN
•The crown should be of a correct length and its margins
should be adapted closely to the tooth.
•For shaping the crown margins mark 3 light points on the
metal at the (mesiolingual, lingual and distolingual)and at
(mesiobuccal, buccal, distobuccal) surfaces at the crest of
respective marginal gingiva without compressing the
marginal gingiva.
•Final finished margins are placed approximately 1mm
below these marks.
26. SEATING THE CROWN
Now the crown is tried on the preparation by
seating the lingual first and applying pressure in a
buccal direction so that the crown slides over the
buccal surface into the gingival sulcus.
Resistance should be felt as the crown slips over
the buccal bulge.
27. CROWN CONTOURING
•Initial crown contouring is performed with a114 plier (ball and
socket plier) in the middle 1/3rd of the crown to produce belling
effect
•This will give the crown more even curvature
28. CROWN CRIMPING
•This is very important to the gingival Health of the
supporting tissue.
•Using the no.417 crimping pliers the crown is crimped
in the gingival third.
•After completion of crimping there
will be gradual bend in the gingival
third of crown.
•The use of crimping is for the
protection of soft Tissues.
29. CHECKING THE FINAL
ADAPTATION OF THE CROWN
The crown should be replaced on the preparation after
the contouring procedure to see that it snaps securely into
place.
The occlusion should be checked at this stage to make
sure that the crown is not opening the bite or causing a
shifting of mandible into an undesirable relationship with
opposing teeth.
30. FINISHING AND POLISHING
Accumulation of plaque and inflammation of
gingiva is commonly seen in practice of restorative
dentistry due to rough and unpolished restoration.
To avoid these complications crown should be
polished prior t o cementation with rubber wheel to
remove all scratches.
32. CEMENTATION
SSC should be cemented
only on clean dry mouth, isolation of teeth with cotton roll
is recommended.
Rinse and dry the crown inside & out side and prepare to
cement it.
A zinc phosphate, polycarboxylate or GIC is preferred.
33. Before the cements set ask the patient to close into
centric occlusion by applying pressure through a
cotton roll and confirm that the occlusion has not been
altered.
34. Remove the excess cement by an explorer or scaler & for
interproximal area can be cleaned by passing dental floss
through them.
37. STAINLESS STEEL CROWN
MODIFICATIONS
In 1971, Mink & Hill report several way of
modifying the stainless steel crown when they
are either too large or too small
• Undersize tooth or the oversize crown.
• Oversize tooth or undersize crown.
• Deep subgingival caries.
• Open contact.
• Open-faced stainless steel crown.