precision attachments/ orthodontic seminars
TRANSCRIPT
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Precision attachments
introductionINDIAN DENTAL ACADEMY
Leader in continuing dental education www.indiandentalacademy.com
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Defination:• This is said to be a connecting link
between the fixed and removable type of partial dentures as it incorporates features common to both types of construction.
• STEIGER &BOITEL: they mean to be of bodily function for a removable partial denture or bridge.
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Nomenclature:
• A retainer consisting of a metal receptacle (matrix) and a closely fitting part (patrix).
• The matrix is usually contained within the normal / expanded contours of the crown on the abutment tooth.
• The patrix is attached to a pontic / the removable partial denture frame work.- glossary of prosthodontic terms.
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SYNONYM :• INTERNAL ATTACHMENT• PARALLEL ATTACHMENT• FRICTIONAL ATTACHMENT• KEY AND KEY WAY ATTACHMENT• SLOTTED ATTACHMENT
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PRECISION ATTACHMENTS• IMPLIES A PARTLY or fully machined
device consisting of a male and a female components which are used in restorative dentistry to retain a removable /semi removable prosthesis . –D.H. roberts .
• Acc. To G.E.ray ,they are wholly or partially machined accessories used to retain a removable /semi removable prosthesis.
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INTRA CORONAL ATTACHMENTS• The bulk of the soldered or cast on
portion of the joint lies within the anatomical contours of the treated teeth.
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EXTRA CORONAL ATTACHMENTS• Are used to join a prosthesis to a
retainer , part of all of their mechanisms is outside the contour of the retainer .
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Chayes attachment
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HISTORY• GEORGE EVANS -1888• PEESO -1898• GILMORE -1913• FOSSUME -1906• BENNET -1904• BROWN , BRYONT,
CONDIT,GOLOBIN ,KELLY , McCOLLUM ,MORGAN , ROACH ,SORENSEN ,SUPPLEE .
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RATIONALE
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RATIONALE• To be removable and replaceable without stress or
strain on abutment teeth .• To permit normal anatomic contour to the abutment
teeth .• To provide many years of comfortable service .• To be made of materials that are compatible with oral
tissues .• Resistance to abrasion• Resistance to corrosion• To be esthetically acceptable• To require minimal amount of tooth structure to be
removed• To be hygenically clean .
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INDICATIONS• Movable joints in fixed movable bridge work .• To stress break , free- end saddles and bridges
.• Intra coronal attachments are effective
retainers for removable partial dentures .• As a connector for sectional dentures .• Sections of a F.P.D may be connected with
intra coronal attachments• To lock a connector joining a saddle in the
opposite side of the arch• to retain hybrid dentures
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CONTRA INDICATIONS• SICK AND SENILE PATIENTS-whose
manual skills are diminished.• Periodontosis.• Abnormal caries rate• Inadequate space to employ
them / place them .
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ADVANTAGES• The labial or buccal clasp arms can
be eliminated• Precision attachments are less
stressful to the abutment teeth than a conventional clasp arm .
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DISADVANTAGES• TOOTH may have to be extensively cut to
place the P.A .• The bulge in the crown , created by the intra
coronal attachment may deprive the underlying gingival tissue of its customary massage .
• The attachment is subject to wear as a result of friction between metal parts .- causing movement & injury to the abutment teeth .
• The extra coronal attachment can cause irritation / inflamation .
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LIMITATIONS• The clinical crown of the abutment
tooth should be of adequate length• Size of the pulp tissue .• Fabrication of the P.A is technique
sensitive .• It is expensive .
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MECHANISIM OF ACTION• FRICTION – ACTIVE RETENSION
CAN BE ENHANCED BY – spring ,leaf ,ring ,bolts ,rubber devices.
• BINDING• WEDGING of conical bodies• INTERNAL SPRING• ACTIVE RETENSION
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MATERIALS USED FOR MAKING THE P. A .• CERAMICOR• ELITOR• OSV• PIVITOR• STAINLESS STEEL• SILVER• LO-CAST• THERMAFIT• 20% IRIDIUM-PLATINUM• CERMACAST• PLATINUM GOLD , etc .
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CLASSIFICATION
Good kind &baker -1975
Intra coronal Extra coronal
resilient
Non resilient
resilient
Non resilient
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Classification-2
PRECISION ATTACHMENTS
Pre fabricatedSemi precision
Eg;Channel-shoulder-pin attachment
PlasticEg;
Renefert’s unirestB , mortice rest
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CLASSIFICATION -3
ACC . TO G.E.Ray
Rigid articulatios Movable articulations
Group-1 (vital teeth)
Group-2 (non vital teeth)
Group-1 –vital teeth Group-2 – non vital teeth
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G.E.RAY – CLASSIFIED P. A -• INTRA CORONAL• EXTRA CORONAL –FLECHER , HUSER .• CONJUNCTORS –CUENOD , DALLA BONA ,
CRISMANI• ANCHORS – GMUR SLIDE BLOCK ,DALLABONA
SLIDE BLOCK /DALBO STUD ANCHOR• BARS-DOLDER-BAR• ACCESSORY COMPONENTS –TRANSVERSE
STABILIZERS,LOCKS,STRESS BREAKER.
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Harold . W. preiskel classified as
P.A
Intra coronal attachments
Frictional – Entirely frictionalMechanical lock
Cross section –H-shaped
T – shapedcircular
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R . VALENTINE & EASTMAN DENTAL HOSPITAL - LONDON
CLASSIFIED AS :
RIGID RETAINERS MOVABLE RETAINERS AUXILLARY DEVICES
RIGID ATTACHMENTS( NON VITAL TEETH)
ADJUSTABLE –CHAYES,MC COLLOM ,STREN , CRISMANI
NON ADJUSTABLE –BEYELER , C&M-643
RIGID ATTACHMENTS (VITAL TEETH)
ALL ADJUSTABLE –ECCENTRICBONA ,GERBER
MOVABLE ATTACHMENTS (NONVITAL)DALBO ,CRISMANI
STRESS BREAKERS (PARTIAL DENTURESGERBER HINGE , ANCORVIS HINGE
MOVABLE ANCHORAGES (NON VITAL )BONA DOLDER BAR , ANDREWS BAR .
ACTIVATORS - ISOCLIP LATCHES , BOLTS , SCREWS SCHUBIGER , HRUSKA
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Spherical resilience anchors
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15.41 – Dr.Dalla bona design – root canal anchor system
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15.42 – Prof.Dr. brunner design
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Cylindrical snap grip anchors.
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anchors
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Intra coronal , screwed slide attachment
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Anchors – mandibular arch.
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Slide attachment
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Slide attachment
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Combi – snap –intra coronal attachment
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Shoulder – dalbo joint with over load protection
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Shoulder Dalbo – bilateral.
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Prospective planning in a bilateral free end saddle
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Rest position – dalbo attachment
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Physiological translation
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Translation and hinge movement
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Articulated unilateral free end saddle
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Articulated uni lateral free end saddle - mandibular
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Pt – snap-intra coronal
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Slide attachments – CM interlock &CM plasta
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Slide attachments
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Prof.Beyeler – slide attachment
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Slide attachment – cm interlock & G. crismani
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Slide attachments
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Snap attachments
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Snap attachments
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w. Wermuth - bioloc
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Dr.spang - stabilex
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Dr spang mini - conex
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Dr.spang mini conex
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s. Guglielmetti
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Slide attachments
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Anchors
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Anchors
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Anchors
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Anchors – Dr.Hruska
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Resilience anchors
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Resilience anchors
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Bar attachments
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Bar attachments
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Resilience attachments
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Resilience attachments
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Resilience joints -Roach
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Coupled resilience joint
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Hinges
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Hinge
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Stabilizer
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Transversal locks
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Transversal lock
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Latches
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Screws , miscellaneous
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PLACEMENT OF PRECISION ATTACHMENTS
TECHNIQUE
DIRECT METHOD INDIRECT METHOD
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