Engler and Prantl system of classification in plant taxonomy
Fluid control and ginigival retraction
1. FLUID CONTROL AND
GINGIVAL RETRACTION
PRESENTED BY:
DR . SAYALI RAUT
1ST MDS
DEPARTMENT OF PROSTHODONTICS
2. CONTENTS:
INTRODUCTION
FLUID CONTROL
•OBJECTIVES
•SOURCES OF MOISTURE IN CLINICAL ENVIRONMENT
•MECHANICAL METHOD OF FLUID CONTROL
•CHEMICAL METHODS OF FLUID CONTROL
GINGIVAL RETRACTION
•DEFINITON
•AIMS AND OBJECTIVES
•PRE RETRACTION ASSESSMENT OF GINGIVAL TISSUES
•METHODS:
A) Mechanical
B) Chemical
C) Chemo-mechanical
D) Surgical
RECENT ADVANCES
LITERARTURE REVIEW
CONCLUSION
5. FLUID CONTROL
• Objectives:
Obtain a dry
clean operating
field
Enhance
operating
visibility and
patient comfort.
Improve the
properties of
restorative
material.
Protect from
swallowing and
aspirating
foreign bodies
Improve the
operating
efficiency
6. SOURCES OF MOISTURE IN ORAL CAVITY
Salivary glands-
parotid,
submandibular
sublingual
AVERAGE
SALIVARY FLOW:
0.3 – 0.4 ml /
min
SALIVA
Inflamed
gingival tissues
Iatrogenic
damage
BLOOD
0.05 to 0.20 µL
per minute
GINGIVAL
CREVICULAR
FLUID Rotary instruments,
three way syringe,
etchants,irrigant
solutions
On a average high
speed rotatory cutting
instruments have
water flow of 30 mL
per minute
WATER/ DENTAL
MATERIALS
7. METHODS OF FLUID MANAGEMENT
MECHANICAL METHODS:
1. Rubber dam
2. Suction devices
3. High volume vacuum
4. Saliva ejector
5. Svedopter
6. Cotton rolls
• CHEMICAL METHODS:
1. Anti – sialogouges
2. Local anaesthetics
3. Clonidine (anti-hypertensive
drug)
10. RUBBER DAM ISOLATION
INDICATIONS
• For core build up, pattern
fabrication
• Impression making of inlays
and onlays
• Removal of old restoration and
caries
• For cementation
CONTRAINDICATIONS
• Should not be used with poly-
vinyl siloxane as interferes with
polymerization
• Patients allergic to latex.
• Patients suffering from asthma
11. RUBBER DAM ISOLATION
ADVANTAGES:
• Isolate one/more teeth
• Eliminates saliva from operating
site
• Retracts soft tissue
• Provides protection to patient and
dentist
• Improves efficiency of the
treatment
DISADVANTAGES:
• Time consuming and patients objection
• Unusual tooth shapes or positions that cause
inadequate clamp placement Partially erupted
or Broken down teeth
• Communication with patients may be difficult
• Mouth breathers
• Incorrect use of clamps can damage the
porcelain crowns/ crown margins/ traumatize
the gingival tissues
12. RUBBER DAM EQUIPMENT
Rubber dam clamps
Rubber dam forceps
Rubber dam sheet
Rubber dam frame
Rubber dam template
Rubber dam accessories
Rubber dam punch
15. SALIVA EJECTOR
• Low volume suction devices
• 300 ml/ min is the suction rate
• Adjunct to high volume vacuum/
rubber dam/cotton rolls.
• Removes saliva from the floor of
mouth
18. SVEDOPTER
Metal saliva ejector with a tongue
retractor
• Used for mandibular arch
• Most effective when patient is in
a nearly upright position.
19. HIGH VOLUME VACUUM
• Powerful suction device
• Uses 10mm diameter HVE tips and a suction
pump set
• Evacuates 1L/min of fluid
• Apparatus also removes small operatory
debris
• Excellent lip retractor
Disadvantage:
• Cannot be used for impression & cementation
procedure
20. ISOLITE ILLUMINATED DENTAL ISOLATION SYSTEM
The Isolite is a new dental device that simultaneously delivers
continuous throat protection, illumination, retraction and isolation
21. The findings
• Neither device to effectively
reduce aerosols and splatter
• There was no significant
difference in the reduction of
aerosols and splatter
between the two devices
Holloman JL, Mauriello SM, Pimenta L, Arnold RR. Comparison of suction device with saliva ejector for aerosol and spatter reduction during ultrasonic
scaling. J Am Dent Assoc. 2015 Jan;146(1):27-33.
Literature review
22. Literature review
In a study by the ADA comparing HVE and a saliva ejector,
results showed the HVE device to reduce up to 90% of particles
reaching the clinician’s breathing space over the saliva ejector
alone .
Through his extensive research, Stephen Harrel concludes that a
standard HVE tip removes 90-98% of aerosols regardless of the
source and proves an effective solution to aerosol containment
and reducing the risks of contamination.
24. COTTON ROLLS
• Controls small amounts of moisture
and retracts cheek and tongue
• Provides acceptable dryness for
procedures like
Cementation
Impression making
• Two types
BraidedWrapped
25. COTTON ROLL HOLDER
• Holds cotton rolls in place
• Advantages
Cheek and tongue are slightly
retracted
Enhances visibility
26. DRY TIPS [MOISTURE ABSORBING CARDS]
• Keeps parotid gland in check for 15 minute
• Absorbs more moisture compared to cotton rolls
27. REFLECTIVE SHIELDS
• Mirror-like reflective film - allows illumination
• Checks saliva control for parotid gland
• Ideal for sealant and dental hygiene procedures
29. DRUGS USED FOR
FLUID CONTROL
Administer for patient with
excessive salivation
Anti- sialagogues
Local anesthetics
Antihypertensives
30. ANTI SIALAGOGUES
• Gastrointestinal anti cholinergic drugs that inhibit action of myo-epithelial cells
of salivary gland
• Common drugs
Atropine 1 tablet of 0.4mg per day
Rosenstiel SF; Contemporary Fixed Prosthodontics; 2014; 4th edition; India; pp: 370
31. MECHANISM OF LOCAL ANAESTHETICS
Action of local
anaesthetics
Pain control needed for tissue displacement
Nerve impulse from the periodontal ligament
regulates the salivary flow
Reduces salivary flow
34. PRE RETRACTION
ASSESSMENT OF
GINGIVAL TISSUES
Forces involved with retraction of
peri-dental tissues:
COLLAPSING
RELAPSING
RETRACTION
DISPLACEMENT
Adnan, Samira & Agwan, Muhammad Atif. (2018). Gingival Retraction Techniques: A Review. Dental update. 45.10.12968/denu.2018.45.4.284.
35. PRE RETRACTION ASSESSMENT OF GINGIVAL TISSUES
CLINICAL ASSESSMENT:
• Colour – pink Consistency – firm Bleeding on probing
• BIOTYPE –Thin gingival biotypes are adversely affected with a sub
gingivally placed restoration.
36. PRE RETRACTION ASSESSMENT OF GINGIVAL TISSUES
RADIOGRAPHIC EXAMINATION:
• peri-apical
• bitewing radiographs
a greater chance of
recession
gingiva is
traumatically
displaced to
record
subgingival
margins
Underlying
defiecinet
bone
Unsupported
soft tissue
37. DEFINITIONS
Gingival displacement
is the deflection of the
marginal gingiva away
from a tooth – GPT 9
Gingival retraction is a
process of exposing
margins when making
impression of prepared
teeth. – Rosensteil
38. OBJECTIVES OF GINGIVAL RETRACTION
Isolation of cavity prepared close to the gingival margin
Control of haemorrhage during restorative material placement
Recording subgingival margins during impression for indirect restorations
Protection of the gingiva during preparation of tooth with subgingival margins
Better visualization of the margins
Diagnosis of subgingival caries
39. CLASSIFICATION OF METHODS OF GINGIVAL
DISPLACEMENT
SURGICAL:
1. Gingivectomy and
gingivoplasty
2. Periodontal flap
procedures
3. Electrosurgery
4. Rotary gingival curettage
NON- SURGICAL:
1. rubber dam and clamps
2. retraction cord-
impregnated/non-
impregnated
3. retraction rings
4. copper bands
(Barkmeier and Williams 1978)
Jain A. Gingival retraction in prosthodontics - A review. Journal of Phmacy Research. 2017: 11(12) ; 1451-61.
40. CLASSIFICATION OF METHODS OF GINGIVAL
DISPLACEMENT
Conventional
Radical
Jain A. Gingival retraction in prosthodontics - A review. Journal of Phmacy Research. 2017: 11(12) ; 1451-61.
(Thompson M.J 1959)
43. MECHANICAL METHODS OF RETRACTION:
• Matrix band and wedges
• Gingival protector
• Retraction crown/sleeve
• Copper ring technique
• Anatomic retraction caps
• Rubber Dam
• Retraction cords
• Special cords
44. MATRIX BANDS AND WEDGES
• Placed inter proximally
• Uses
1. Depresses gingiva
2. Matrices with gingival
extension provides
displacement of gingiva
45. GINGIVAL PROTECTOR
• This has a crescent shaped tip on
an adjustable ball joint attached to
a metal handle
• Can be placed and adjusted
according to the contour of the
gingival tissues
• Protects the Gingiva during
preparation of tooth structure
close to the gingival margin
• USES:
1. Veneer preparation
2. Finishing porcelain/resin
3. Sub gingival caries
4. Check fitting of margins of crown
Thomas MS, Joseph RM, Parolia A. Nonsurgical gingival displacement in restorative dentistry. Compend Contin Educ
Dent. 2011 Jun;32(5):26-34; quiz 36, 38.
46. RETRACTION CROWN OR SLEEVE
Temporary crown filled with thermoplastic stopping material or bulky temporary cement
Excess
material is
removed
Crown placed
on prepared
tooth
Excess of
temporary
material lined
on the finish
line
Temporary
crown
adapted to
the finish line
Thomas, Manuel & Joseph, Robin & Parolia, Abhishek. Nonsurgical gingival displacement in restorative dentistry. Compendium of continuing
education in dentistry (Jamesburg, N.J. : 1995). 32. 26-34; quiz 36, 38.
47. Other method:
Custom temporary
restorations with
blunt gingival ends
Covered with bulky
temporary cements
like ZOE
(periodontal packs)
left in place until
the next
appointment when
the final
impression is made
48. Recession of gingiva in case it is placed for more than 12
hours
Delayed impression
Cervical region of teeth becomes sensitive and
susceptible to caries
Disadvantages of retraction crowns/ sleeves
49. Copper band technique
• Means of carrying the impression material and a mechanism for
gingival retraction.
51. Copper band technique
copper band is filled with modelling compound or elastomeric impression
material, and seated on the prepared tooth along the path of insertion.
52. Temporary acrylic resin coping constructed
Tray adhesive applied
Filled with elastomeric impression material and
reseated
Tissue displacement occurs
Full arch impression made
TEMPORARY ACRYLIC COPING
56. RETRACTION CORD
• Gingival retraction cord is a tapered
diameter cord that can be wrapped
several times about a tooth that
causes flared gingival crevice
58. 1) Depending on the
configuration
Twisted:
Allow the dentist to
customize the cord as
individual strands can be
removed
Knitted:
Interlocking loops
Longitudinally elastic AND
Transversely resilient
Braided:
Firm
Flexible
Multistrand
60. Depending on the thickness:
Black - 000
Yellow - 00
Purple - 0
Blue - 1
Green - 2
Red - 3
61. 000 00 0 1 2 3
Anterior
teeth (with
thin gingival
biotype)
Preparing and
cementing
veneers
Lower anteriors.
Second cord for
"two-cord"
technique
Tissue control and/or
displacement when soaked
in coagulative hemostatic
solution prior to and/or
after crown preparations
Upper cord for
"two-cord"
technique
Areas that have
fairly thick
gingival tissues
where a Significant
amount of force is
required
Double
packing,
lower cord
in the "two-
cord"
technique
Restorative
procedures
dealing with
thin, friable
tissues
When luting near
gingival and
subgingival
veneers, Class III,
IV and V
restorations
Protective "pre-
preparation" cord on
anteriors
Protective
"pre-
preparation"
cord on
anteriors
Upper cord for "two-
cord" technique
INDICATIONS OF DIFFERENT RETRACTION CORD
THICKNESSES
62. Cinthya M, Taciana E, Taciana M F, Carlos M A. Gingival retraction: thickness measurement and comparison of different cords, Brazillian Dent Sci,
2015: 18(2) ; 50-57.
63. Conclusion of this study:
• The mean thickness found for the evaluated cords demonstrated
that the similar sizes assigned by the manufacturers mismatched
the real dimensions
• Only similar thickness was seen for the brands Ultrapack and
Retraflex at size 000 and brands Ultrapack and Retractor at size 0.
Cinthya M, Taciana E, Taciana M F, Carlos M A. Gingival retraction: thickness measurement and comparison of different cords,
Brazillian Dent Sci, 2015: 18(2) ; 50-57.
65. If a dry field has been achieved
Non Impregnated cord left in
place for a sufficient time
Extreme narrow sulci Wool like cords which can
be flattened for initial
displacement
Given a choice, always choose impregnated cords over plain cords
unless contraindicated
As a rule, the thickest cord that is accepted by the sulcus should be
used
71. Single cord technique
Lightly secure the distal
interproximal area
Proceed to the lingual surface
from mesial to distal
72. Single cord technique
Occasional use of extra
instrument to hold the cord and
packing with other
The cord is gently pressed
apically with the instrument,
directing the tip slightly
towards the root
73. Single cord technique
Excess cord cut off in the mesial
area as closely as possible to the
interproximal area
Pack all but the last 2.0 or 3.0 mm
of cord
74. If the instrument is directed totally in an
apical direction, the cord will rebound
off the gingiva and roll out of the sulcus
75. If cord rebounds from a particularly tight area
of the sulcus
DO NOT TO DO
do not apply greater force maintain gentle force for a longer time
still rebounds
change to a smaller or more pliable cord (ie,
twisted rather than braided)
78. DOUBLE CORD TECHNIQUE
A smaller diameter cord soaked with haemostatic
agent placed into the depth of the sulcus
Causes some lateral tissue displacement but
primarily controls hemorrhage.
The second larger diameter cord is then packed into
the sulcus, causing further lateral tissue
displacement for 8-10 mins
The first deeper placed cord stays in place when the
impression is made, after removal of the top, larger
diameter cord
79. INFUSION TECHNIQUE
Indications – Controls haemorrhage
Fill the syringe with Fe2(SO4)3 solution and
attach the infuser tip
This hollow
metal tip
contains a cotton
filament to help
control flow of
the medicament.
80. INFUSION TECHNIQUE
• Rub the tip back and forth
for approximately 30 secs
over the hemorrhaging
area• Slowly replenish the solution
by continuous injection
81. INFUSION TECHNIQUE
Irrigate the area
with an air-water
syringe and
gently air dry.
Inspect to
determine if
bleeding has
diminished.
Repeat several
times, if
necessary
Retraction cord is
placed in the
conventional
manner
82. EVERY OTHER TOOTH TECHNIQUE
Rationale
Anterior tooth
preparation
when the
roots are in
proximity
Placing the
retraction
cord
simultaneousl
y around all
teeth
Strangulation
of interdental
papillae
Impair
gingival health
and can cause
black inter-
dental
triangles.
Every other
tooth
technique
(Prevents this
collapse of
gingival
papilla)
83. EVERY OTHER TOOTH TECHNIQUE
Sudhapalli S. Sectional Impressions and 'Every Other Tooth' Technique in FPD. J Clin Diagn Res. 2017 Jan;11(1):ZD18-ZD20.
86. Historic background
• Laufer found – minimum sulcular width of 0.2 mm to prevent
distortion of the sulcular impression
• Caustic chemicals like Sulfuric Acid, Tri choloroacetic acid, Negatol
(45%comdensation product of Metacresol Sulfonic acid and
formaldehyde) and Zinc Chloride – undesirable effect on gingiva –
abandonment
• 1980s - 8% racemic epinephrine most commonly used
Shillingburg HT; Fundamentals of Fixed Prosthodontics; 2012; 4th edition ; Quintessence publications; USA; pp:273
88. 1. The pulse rate of patients after application of racemic epinephrine-
impregnated retraction cords depends more on the level of anxiety and stress
than on the level of the epinephrine.
2. Blood pressure is elevated by placement of racemic epinephrine-
impregnated retraction cords upon an exposed vascular bed or lacerated
tissue.
3. 4% racemic epinephrine-impregnated retraction cords cause less elevation of
blood pressure than 8% racemic epinephrine cords.
4. Although the elevations in blood pressure from 8% cord occur within a
narrow range, this range may be hazardous to cardiac patients. Therefore, 4%
racemic epinephrine cord should be used.
5. A desirable amount of tissue retraction is produced by 4% racemic
epinephrine cord.
6. Dry cords do not provide adequate retraction of tissue and are
contraindicated for tissue-retraction purposes.
Pelzner RB, Kempler D, Stark MM, Lum LB, Nicholson RJ, Soelberg KB. Human blood pressure and pulse rate response to racemic epinephrine
retraction cord. J Prosthet Dent. 1978 Mar;39(3):287-92.
94. ROTARY CURETTAGE/GINGETTAGE
Rotary curettage is a "troughing" technique, the purpose of which is to
produce limited removal of epithelial tissue in the sulcus while a chamfer finish
line is being created in tooth structure.
The concept of using rotary curettage was described by Amsterdam in 1954.
developed by Hansing and subsequently enlarged upon by Ingraham.
Suitability of gingiva for the use of this method is determined by three factors:
1. Absence of bleeding upon probing,
1.2. Sulcus depth less than 3.0 mm,
2.3. Presence of adequate keratinized gingiva
95. A shoulder finish line is
prepared at the level of the
gingival crest with a flat-
end tapered diamond
A torpedo diamond of 150 to 180
grit is used to extend the finish
line apically, one-half to two-thirds
the depth of the sulcus, converting
the finish line to a chamfer
Cord impregnated with
aluminum chloride4 or alum is
gently placed to control
hemorrhage
97. ELECTROSURGERY
Passage of a high frequency current
through the tissue from a large electrode
to a small one.
Produces a high current density
Rapid temperature rise at its point of
contact with the tissue.
Induces rapid localized polarity changes
Cell breakdown
The inner epithelial lining of
the gingival sulcus is removed
99. Pressure required for electrosurgery
• The pressure required has been described as the same needed to
draw a line with an ink-dipped brush without bending the bristles
Shillingburg HT; Fundamentals of Fixed Prosthodontics; 2012; 4th edition ; Quintessence publications; USA; pp: 285
102. The Cord positioning force
• There may be inadvertent excessive use of force while tucking the
cord in the sulcus, particularly when the patient is anaesthetized
• A study by Van der Velden and De Vries has shown that the
epithelial attachment sustains injuries at a force of 1 N/mm2 , while
it ruptures at 2.5 N/mm2 .
• The cord technique requires almost 2.5 N/mm2
103.
104. Displacement pastes
• Introduced by Satalec Pierre
Rolland
• Composition
1. Aluminum chloride-15%
astringent & hemostatic
agent
2. Kaolin
3. Excipients
Recommended time of application-1-2 min
105. Paste is directed into the
gingival tissues
Completely injected kept
for 1- 2 mins
Paste is removed with
copious amounts of water
Prepared tooth before
impression is made EXPASYL
106. Advantages Disadvantages
Less traumatic to tissues than
cord packing.
Expensive
Faster than traditional cord. Disposable metal dispenser
tips are too large causes
difficulty to express
Easy removal from sulcus by
rinsing.
Less tissue displacement than
with cord
Dispenser tips can bent-
improves intraoral access
Thickness makes it difficult to
express
107. Magic foam
• Developed by Prof Dr. Dumfahrt
• First expanding vinyl polysiloxane
material designed for retraction
of the gingival sulcus
• Mechanism - Expansion of silicon
foam
108. Tooth preparation
complete
Magic foam injected
Pressure applied with
hollow cotton roll
Final result of
retraction
LIMITATIONS:
• Less hemo-static
• No improvement in
speed/quality
compared to cord
• Less effective on
sub gingival margin
109. Gingitrac (Centrix co)
• Mild natural astringent gel
Gingicap Ginigtrac dispensed
Injected around the
tooth
Patient asked to bite Retraction result
110. Occlusal Matrix Impression Technique
Carrier for the
matrix
Matrix made with
elastomeric putty
Facial & palatal sides
are trimmed
Matrix in place in
the mouth.
medium-viscosity
impression material
Seated with light
pressure
Completed
impression.
Livaditis GJ: The matrix impression system for fixed prosthodontics. J Prosthet Dent 79:208, 1998
111. MEROCEL STRIPS
• Synthetic material that is biocompatible
polymer
hydroxylate polyvinyl acetate
• Mechanism of action
Expands by absorption of oral fluids and
exerts pressure on surrounding tissue
112. ADVANTAGES:
Shivasakthy M, Asharaf Ali S. Comparative Study on the Efficacy of Gingival Retraction using Polyvinyl Acetate Strips and
Conventional Retraction Cord - An in Vivo Study. J Clin Diagn Res. 2013 Oct;7(10):2368-71.
• Easily shaped and adapted around
tooth
• Highly effective in absorption of oral
fluids
• Non abrasive
14 maxillary tooth requiring complete metal ceramic restoration
Retraction was done using merocel and conventional method
Mean vertical retraction of gingival cord - 2.02
Mean vertical retraction of retraction strips - 2.78
113. LASERS
• Useful for tissue contouring procedures.
• Controlled tissue removal before impression
making
• ADVANTAGES:
1. Minimum pain and discomfort
2. Less fear ,anxiety and stress
3. Minimum or no anesthesia
4. No drill sounds
5. Less chair time
6. Reduced post operative complications
7. Minimum or no bleeding
Trough
made with
the laser
Impression
114. Stay put retraction cord
• Fine metal filament reinforced
displacement cord
• Impregnated or non impregnated
• Consist of braided retraction cord
and ultrafine copper filaments
• Remains in shape and does not
deform
115. Gingival displacement in digital impressions
• 15% aluminum chloride in an
injectable matrix
• Cords avoided to prevent
artifacts on digital impression
Retraction Capsule
116. Tooth prepared
3M ESPE Retraction
Capsule
Injected around the
tooth
Rinsed after 1 min
Dried
Digital impression
made
Impression
120. Retraction was done with:
1. Aluminum chloride
2. Tetrahydrozoline
3. Expasyl
Calculated on stereomicroscope under 20x and images were transferred to image
analyser
CONCLUSION:
The amount of gingival retraction obtained by using aluminium chloride as gingival
retraction agent was maximum (148238.33 μm2) compared to tetrahydrozoline
(140737.87 μm2) and Expasyl (67784.90 μm2).
121. Azzi R, Tsao TF, Carranza FA Jr, Kenney EB. Comparative study of gingival retraction methods. J Prosthet Dent. 1983 Oct;50(4):561-5.
122. Tao X, Yao JW, Wang HL, Huang C. Comparison
of Gingival Troughing by Laser and Retraction
Cord. Int J Periodontics Restorative Dent. 2018
Jul/Aug;38(4):527-532.
Comparison between pre
saturated cord and 3 lasers:
1. Nd: YAG
2. Er: YAG
3. Diode lasers
The gingival width and recession
was measured at the time of
treatment after 1 week and after
4 weeks in 108 anterior preps
Conclusion:
1. Lasers resulted in wider sulci
less post treatment
recession, less inflammation
and more patient comfort
2. Er: YAG fast and uneventful
healing as compared to other
lasers
123. Phatale S, Marawar PP, Byakod G, Lagdive SB,
Kalburge JV. Effect of retraction materials on
gingival health: A histopathological study. J Indian
Soc Periodontol. 2010 Jan;14(1):35-9.
• evaluate the effect of Expasyl, Magic Foam Cord, and
impregnated retraction cord on the gingival sulcular
epithelium
Aim
• 30 cases of bilateral premolars which were extracted and
retraction was studied on them
study
• Expasyl or Magic Foam Cord was found to be better than cord as
assessed histologically,
• it respects periodontium
conclusion
124. Gupta A, Prithviraj DR, Gupta D, Shruti DP.
Clinical evaluation of three new gingival
retraction systems: a research report. J
Indian Prosthodont Soc. 2013
Mar;13(1):36-42.
Stayput
Magic foam cord
Expasyl
Magic foam cord retraction system can be
considered more effective
Ease of handling
Time taken for placement
Hemorrhage control
Amount of gingival retraction
125. List of studies included in this review
Tabassum S, Adnan S, Khan FR. Gingival Retraction
Methods: A Systematic Review. J Prosthodont. 2017
Dec;26(8):637-643.
• The most common method used for gingival
retraction was chemomechanical.
• No method seemed to be significantly
superior to the other in terms of gingival
retraction achieved
Method Gingival retraction (in
mm)
Mechanical 0.19 – 0.23
Chemo
Mechanical
0.02 – 0.46
Surgical 0.03 – 0.45
126. CONCLUSION
• Accurate impressions are critical for the success of fixed dental
prosthesis
• Fluid control and Gingival retraction holds an indispensable place during
soft tissue management before an impression is made.
• A wide variety of options are available for tissue management
• The choice of technique and material for gingival displacement depends
on the operator’s judgment of the clinical situation
• Most practitioners use the chemo mechanical method of gingival
retraction
• However, the cordless retraction is the one which causes least harm to
the periodontium
enhance the operator visibility , accurate reproduction of finish line, increased patient comfort
sub gingival margins, the adjacent tissues must be retract to allow access and to provide adequate thickness of the impression material.
All this should be done without jeopardizing the periodontal health
•Most effective of all isolation devices
Lubricant or petroleum jelly : Usually applied on the undersurface of the dam and it is helpful when the rubber sheet is being applied to the teeth
Dental floss: Used as flossing agent for rubber dam in tight contact areas
Wedjets : Some wedjets are required to support the dam
INDICATIONS OF EACH ONE OF THESE
to hold the rubber dam onto the tooth
Data comparing aerosols present during air abrasion cutting
(a.a.) with and without use of HVE and the added effect of a
ceiling mounted air purifier (Phantom) used on different
settings in an 8x10 foot operatory with an 8-foot ceiling. The
figure shows a 95 percent reduction in aerosols due to use of
HVE alone when adjusted at optimal velocity and positioned
close to the operating site during a.a use
FIND SOMETHING TO SAY ABOUT THIS
A JADA research report compared a saliva ejector to ISOLITE ILLUMINATED DENTAL ISOLATION SYSTEM for aerosol and splatter reduction during and after ultrasonic scaling.
Useful for short period of isolation
Alternatives when rubber dam application is
impractical
Retracts cheek & provide absorbency
Commonest and cheap
Preparation in maxillary arch – Block off the parotid duct
In mandibular arch – block sublingual and submandibular ducts.
Anti Ach drugs used in caution with older patients with heart diseases or glaucoma. Glycopyrollate (anticholinergic) is used in adjunctive treatment of peptic ulcers and have dry mouth as its side effect
Retraction is the downward and outward force exerted on the gingival tissues by the retraction technique or material
Displacement is the downward force resulting from excessive pressure during retraction or in unsupported gingival tissues
Relapse is when the gingival tissues rebound to their original position
Collapse is when the gingival tissues are further compressed towards the tooth as a result of using close-fitting trays for impression
placement of subgingival margins and the procedures undertaken to record these margins can damage the delicate gingiva. If the tissues are already compromised, any traumatic retraction method can further damage the tissues
to assess interproximal bone levels and crestal bone height, as well as infra-bony pockets and boss loss.
Check where it is from
These techniques involve:
physically retracting and displacing the soft tissues,
making space for the impression material to reach the subgingival preparation,
providing haemostasis and controlling crevicular fluid
Matrix bands can provide retraction of gingiva and isolation when used for cervical or subgingival restorations
Non surgical method mostly used in restorative dentistry
The use of copper bands can cause incisional injuries of gingival tissues, but recession following their use is minimal, ranging from 0.1 mm in healthy adolescents to 0.3 mm in a general clinic population.
same principle as the copper bands, except that they are pre-shaped
The physical pressure arrests haemorrhage and opens the sulcus
Schultz, CLAMPS -
Similar to 212 series but split into half faciolingually.
Produced retraction by compression
Plain cord provides mechanical retraction & chemically impregnated retraction cord is a CHEMO MECHANICAL method of displacement
What are the uses of each ones of these types? Which ones are better
To evaluate the real thickness of the cords of different manufacturers.
So giving indications size wise is not justifiable.
Knitted and braided are better than twisted cords.
So apart from the cord, we also need:
Piece of (5cm 2 inches) is cut off
Hold between thumb n fore finger. Braided or knitted no need to twist. Twisted or wound cord – twisting reduces diameter
Do not touch the cord anywhere except the ends with gloves. (cut in the end) – not just infection control indirect inhibition of polymerisation of polyvinyl siloxane by latex
U shaped loop – hold between thumb n index finger with slight apical pressure.
to hold the cord in position while its being placed
Tip of the instrument towards toe already placed area i.e. mesial to prevent pulling out of the already placed cord
Its slid gingivally until the finish line is felt.
Continue packing the cord around the facial surface, overlapping the cord in the mesial interproximal area. The overlap must always occur in the proximal area, where the bulk of tissue will tolerate the extra bulk of cord other wise a gap apical to the overlap. This tag is left protruding so that it can be grasped for easy removal.
Tissue retraction should be done firmly but gently, so that the cord will rest at the finish line.
After 10 minutes, remove the cord slowly to avoid bleeding - shillinburg
Tissue would collapse with the use of only a single cord
Do not dry the cords – or else they will adhere to the tissues and cause hemorrhage
The ferric sulfate medicament is available in two concentrations, 15% and 20% the 20% material being less acidic because of the presence of binders and coating agents and causing less removal of the smear layer from dentine
Burnishinig motion.
Three ideal requirements – effectiveness in gingival displacement and hemotasis
Absence of irreversible damage to the gingiva
Minimal systemic side effects
Epinephrine syndrome – Tachycardia, rapid respiration, elevated blood pressure, anxiety, post operative depression.
Rotary curettage, however, must be done only on healthy, inflammation-free tissue to avoid the tissue shrinkage that occurs when diseased tissue heals. inserting a periodontal probe into the sulcus. If the segment of the probe in the sulcus cannot be seen, there is sufficient keratinized tissue to employ rotary curettage
A generous water spray is used while preparing the finish line and curetting the adjacent gingiva
1 to 4 million Hz [1 Hz = 1 cycle/second)
Cutting electrode and passive electrode have same current but due to difference in the size – current density is different
The current concentrates at points and sharp bends. Cutting electrodes are designed to take advantage of this property so they will have maximum effectiveness. DIFFERENCE BETWEEN ELECTRO SURGERY AND ELECTRO CAUTERY.
Also, the electrode should move at a speed of no less than 7 mm/sec while retracing the path of a previous cut, 8 to 10 seconds should be allowed to elapse before repeating the stroke. minimize the buildup of lateral heat that could disrupt normal healing.
Verify the anaesthesia place a drop of a pleasant-smelling aromatic oil. The odour from it will help to mask.
First set the current acc to manufacturer's recommendations. If the tissue clings to the electrode tip – low current setting
If the tissue is charred/ sparks are seen / discoloured – setting is high
can lead to haemorrhage and damage to the sulcular and junctional epithelium. can lead to gingival recession later, due to disruption in blood supply and damage to the periodontal attachment fibres
It has both mechanical and chemical action
Aluminum chloride provides- hemostasis
Viscosity of Kaolin- retracts the tissue
interference in polymerization of poly vinyl siloxane materials – so clean thoroughly
Improved displacement – if paste is directed into the sulcus by applying pressure with a hollow cotton roll.
Pt closes om the cotton roll maintaining pressure for 5 minutes
Similar to magic foam except – astringent and not an expander
Gingicaps are provided by the manufacterer
Overuse causes shrinkage of tissue and also results in exposure of crown margin
Astringent retraction paste supplied in a single-use capsule
STUDY ON DOGS
F - Cord impregnated with 8% zinc chloride plus 8:lOO racemic epinephrine
K Zinc chloride (8%), a cord impregnated with 8% zinc chloride solution
L Zinc chloride (40%), a cord impregnated with 40% zinc chloride solution
This study analyzes three currently used methods of
gingival retraction:
(1) retraction cord
(2) Electrosurgery
(3) rotary gingival curettage.