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Single Complete DenturesSingle Complete Dentures
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Maxillary Single DenturesMaxillary Single Dentures
More common Teeth usually lost before
their mandibular antagonists
More common Teeth usually lost before
their mandibular antagonists
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Construction of a maxillary complete denture opposing a natural mandibular
dentition
• Life will not be so difficult as we have a much more stable base with a maxillary denture
• Again ensure that the opposing dentition can be
made level
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Single DenturesSingle Dentures
More difficult Tooth malpositions decrease
stability (extrusion, tipping, rotation)
Difficulty balancing
More difficult Tooth malpositions decrease
stability (extrusion, tipping, rotation)
Difficulty balancing
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Preparing Plane of Occlusion
Individual Tooth Modifications– Sharp Unworn
Cusps• Reduce cuspal
inclination– Heavily Abraded
Teeth• Reduce Bu-Li
width
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Construction of a mandibular complete denture opposing a natural
maxillary dentition
• Life would be simpler if you are never confronted with this problem.
• Avoid creating this situation if possible
• If construction of this denture is unavoidable ensure that the opposing teeth are on a level plane
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Mandibular Single DenturesMandibular Single Dentures
Avoid when possible Severe ridge resorption due to
force Stress reduction should be used
– Processed resilient denture liner– Overdenture– Implant retained denture
Avoid when possible Severe ridge resorption due to
force Stress reduction should be used
– Processed resilient denture liner– Overdenture– Implant retained denture
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Other Strategies
• leave roots for over-denture support
• temporary soft liners replaced on a regular basis
• permanent soft liners
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Single DenturesSingle Dentures
More difficult Greater force causes
– Displacement– Fracture due to flexure– Severe residual ridge resorption
More difficult Greater force causes
– Displacement– Fracture due to flexure– Severe residual ridge resorption
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1) The subsequent problems with single denture against natural teeth
2)How to overcome these problems.
3) Combination syndrome and associated changes (Kelly syndrome)
4) Recording intermaxillary relations for single denture.
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5) Occlusion and articulation A) Tooth modification
and occlusal adjustment:
i)Swenson technique ii) Bruce technique. iii) Yurkstas technique. iv) Boucher technique. B) Common occlusal
disharmonies.
5) Occlusion and articulation A) Tooth modification
and occlusal adjustment:
i)Swenson technique ii) Bruce technique. iii) Yurkstas technique. iv) Boucher technique. B) Common occlusal
disharmonies.
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6) Methods used to achieve balance articulation
I) Statically equilibrated occlusion using a programmed
articulator to simulate the patient mandibular
movement .
a) Articulator equilibrated technique
b) Articulator generated path technique
6) Methods used to achieve balance articulation
I) Statically equilibrated occlusion using a programmed
articulator to simulate the patient mandibular
movement .
a) Articulator equilibrated technique
b) Articulator generated path technique
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The subsequent problems with single denture against natural teethThe subsequent problems with single denture against natural teeth
1) Firmness and rigidity in which the natural teeth retained in bone.
2) the occlusal form of the remaining natural teeth.
3) Esthetic problems due to the fixed position of the mandibular teeth.
4) The abrasion of the acrylics or natural teeth
1) Firmness and rigidity in which the natural teeth retained in bone.
2) the occlusal form of the remaining natural teeth.
3) Esthetic problems due to the fixed position of the mandibular teeth.
4) The abrasion of the acrylics or natural teeth
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2)How to overcome these problems.2)How to overcome these problems.
Proper diagnosis , proper denture construction procedures.
Dissipation of occlusal forces along the denture base.
Appropriate preparation of the remaining natural teeth.
Proper diagnosis , proper denture construction procedures.
Dissipation of occlusal forces along the denture base.
Appropriate preparation of the remaining natural teeth.
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3) Combination syndrome and associated changes (Kelly syndrome)
3) Combination syndrome and associated changes (Kelly syndrome)
It appears during construction of mandibular distal extension partial denture against a complete maxillary denture and includes:
1) Loss of bone from the maxillary anterior edentulous ridge
2) Down growth of maxillary tubersity.3) Papillary hyperplasia of the tissues in the hard palate.4) Extrusion of the lower anterior teeth5) loss of bone beneath the removable partial denture
bases,
It appears during construction of mandibular distal extension partial denture against a complete maxillary denture and includes:
1) Loss of bone from the maxillary anterior edentulous ridge
2) Down growth of maxillary tubersity.3) Papillary hyperplasia of the tissues in the hard palate.4) Extrusion of the lower anterior teeth5) loss of bone beneath the removable partial denture
bases,
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Combination syndrome has six associated changes:
1) loss of vertical dimension of occlusion.
2) Occlusal plane discrepancy.
3) Anterior spatial resumption of the mandible .
4) Development of epulis fissuratum.
5) Poor adaptation of the prosthesis.
6) Periodontal changes.
This syndrome is a result of great magnitude of force,
the unsuitability of the denture foundation to resist them, and the unfavorable occlusal relationship.
Combination syndrome has six associated changes:
1) loss of vertical dimension of occlusion.
2) Occlusal plane discrepancy.
3) Anterior spatial resumption of the mandible .
4) Development of epulis fissuratum.
5) Poor adaptation of the prosthesis.
6) Periodontal changes.
This syndrome is a result of great magnitude of force,
the unsuitability of the denture foundation to resist them, and the unfavorable occlusal relationship.
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4) Recording intermaxillary relations for single denture.
4) Recording intermaxillary relations for single denture.
1) Freeing the anterior occlusion rim.
2) Using gothic arch tracer for centric relation, or using zinc oxide paste or wax for recording centric relation.
1) Freeing the anterior occlusion rim.
2) Using gothic arch tracer for centric relation, or using zinc oxide paste or wax for recording centric relation.
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Avoid a Single Denture Against Anterior Teeth AloneAvoid a Single Denture Against Anterior Teeth Alone
Resorption Loosening Fracture Combination
Syndrome
Resorption Loosening Fracture Combination
Syndrome
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Single Complete DenturesSingle Complete Dentures
– Reduce cusps in shaded area, to level plane of occlusion– Reduce cusps in shaded area, to level plane of occlusion
Mock adjustment can be
performed on a diagnostic cast Mock adjustment can be
performed on a diagnostic cast
Severe Curve of Spee
Supereruption
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Single Complete DentureSingle Complete Denture
Occlusal adjustment of natural teeth– Reduce severe curve of Spee level
supraeruptions– Recontour rotated teeth
to permit contacts on flat surfaces
Occlusal adjustment of natural teeth– Reduce severe curve of Spee level
supraeruptions– Recontour rotated teeth
to permit contacts on flat surfaces
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Avoid a Single Denture Against Anterior Teeth AloneAvoid a Single Denture Against Anterior Teeth Alone
Fabricate a RPD for Stress Distribution
Make CD & RPD at the same time– Ensures optimal occlusion
Fabricate a RPD for Stress Distribution
Make CD & RPD at the same time– Ensures optimal occlusion
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Occlusion RimsOcclusion Rims Use to establish OVD,
NOT Incisal Display Overbite will be
incorporated when anterior teeth are set, lengthening incisal edges
Use to establish OVD, NOT Incisal Display
Overbite will be incorporated when anterior teeth are set, lengthening incisal edges
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Occlusion RimsOcclusion Rims
Flat Surface for Opposing Teeth– No inclines– If steps in occlusal
plane, provide flat areas for opposing natural teeth
Flat Surface for Opposing Teeth– No inclines– If steps in occlusal
plane, provide flat areas for opposing natural teeth
XX
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Maxillo-Mandibular RelationsMaxillo-Mandibular Relations
Occlusion Rims on RPD framework
Opposes CD Rims Centric and eccentric
records with Alluwax Optimizes occlusion
Occlusion Rims on RPD framework
Opposes CD Rims Centric and eccentric
records with Alluwax Optimizes occlusion
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Maxillo-Mandibular RelationsMaxillo-Mandibular Relations
Crowns or bridges should be waxed up against the CD tooth setup
Optimizes occlusion Ensures, changes can be
made
Crowns or bridges should be waxed up against the CD tooth setup
Optimizes occlusion Ensures, changes can be
made
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Maxillo - Mandibular RelationsMaxillo - Mandibular Relations
Centric Registration– Extraoral hand
position if opposing natural dentition (less obtrusive)
Centric Registration– Extraoral hand
position if opposing natural dentition (less obtrusive)
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Setting Anterior TeethSetting Anterior Teeth
More difficult– Setting for esthetics may
produce excessive overbite with natural teeth
– Decreases stability– Compromised position,
used to balance need for esthetics & function
More difficult– Setting for esthetics may
produce excessive overbite with natural teeth
– Decreases stability– Compromised position,
used to balance need for esthetics & function
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5) Occlusion and articulation A) Tooth modification and occlusal
adjustment: i) Swenson technique: Repeated
diagnostic casts with modifications to the natural teeth.
ii) Bruce technique: using clear acrylic resin with pressure indicating paste in the fitting surface.
5) Occlusion and articulation A) Tooth modification and occlusal
adjustment: i) Swenson technique: Repeated
diagnostic casts with modifications to the natural teeth.
ii) Bruce technique: using clear acrylic resin with pressure indicating paste in the fitting surface.
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iii) Yurkstas technique: Using a metal U shaped occlusal template that is slightly convex on the lower surface.
iv) Boucher technique: Using porcelain teeth to grind the stone
teeth . Common occlusal disharmonies.
iii) Yurkstas technique: Using a metal U shaped occlusal template that is slightly convex on the lower surface.
iv) Boucher technique: Using porcelain teeth to grind the stone
teeth . Common occlusal disharmonies.
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Posterior Denture Teeth Posterior Denture Teeth
Requires more adjustment to obtain stable centric contacts– Denture teeth will not normally
articulate well with natural dentition
– Pinpoint contacts/inclines, etc.
Requires more adjustment to obtain stable centric contacts– Denture teeth will not normally
articulate well with natural dentition
– Pinpoint contacts/inclines, etc.
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Cast Metal Denture BaseCast Metal Denture Base
Use if denture fractures repeatedly
Usual causes: – Heavy forces from natural
teeth – Occlusal contacts on inclines – Impingement on a bony
midline • flexing of the denture
Use if denture fractures repeatedly
Usual causes: – Heavy forces from natural
teeth – Occlusal contacts on inclines – Impingement on a bony
midline • flexing of the denture
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Denture Teeth WearDenture Teeth Wear
More rapid against natural teeth More frequent recalls Adjust occlusion to prevent
changes in stress distribution
More rapid against natural teeth More frequent recalls Adjust occlusion to prevent
changes in stress distribution
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Denture Teeth Wear More RapidlyDenture Teeth Wear More Rapidly
Never use porcelain denture teeth – Severe attrition of natural teeth– Prefer denture teeth to wear
Never use porcelain denture teeth – Severe attrition of natural teeth– Prefer denture teeth to wear
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When the occlusal plane has been levelled , what type of occlusion will we have?
thisor
this
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The second choice is more likely because:
• natural tooth guidance would have a tendency to dislodge the denture
• the natural teeth are seldom situated in positions that allow the cusp to fossae, cusp to embrassure relationship
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The Golden Rulefor this type of case
Equal contacts in centric occlusion and no interferences in excursive
movements
(commonly referred to as functional occlusion)
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“An occlusal scheme that employs a multiplicity of point contacts, rather than one that utilizes broad-surfaced contacts on inclined planes is advocated.”
John J. Shary
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Centric Occlusion
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Working
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Protrusive
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Premolar Occlusion
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What about this arch opposing a single denture?
We know now how to deal with this
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With some careful grinding of the canines we can produce a bilateral balanced occlusion
As a general rule, the closer the situation resembles a complete upper and lower denture set-up, the better the chance for bilateral balanced occlusion
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If for economic reasons, periodontal concerns, sensitive teeth, etc. the patient wishes to have no mandibular tooth replacement, what then?
• patient education
• metal palate in the maxillary denture
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typical examination questions
• in an organized summary, discuss the problems of the single denture wearer and possible solutions to specific problems
• discuss the problems faced by the patient wearing a specific type of single denture and propose strategies to cope with the problems
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2)How to overcome these problems.2)How to overcome these problems.
Proper diagnosis , proper denture construction procedures.
Dissipation of occlusal forces along the denture base.
Appropriate preparation of the remaining natural teeth.
Proper diagnosis , proper denture construction procedures.
Dissipation of occlusal forces along the denture base.
Appropriate preparation of the remaining natural teeth.
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iii) Yurkstas technique: Using a metal U shaped occlusal template that is slightly convex on the lower surface.
iv) Boucher technique: Using porcelain teeth to grind
the stone teeth . Common occlusal disharmonies.
iii) Yurkstas technique: Using a metal U shaped occlusal template that is slightly convex on the lower surface.
iv) Boucher technique: Using porcelain teeth to grind
the stone teeth . Common occlusal disharmonies.
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A level plane may be established by extraction, grinding of cusps, crowns
or occlusal build-ups
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Thank You
Thank You