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level: COMPONENTS PART 1

Questions and Answers List

level questions: COMPONENTS PART 1

QuestionAnswer
RPD is like fixed partial denture because natural teeth alone provide direct resistance to functional forcesTooth-bound spaces
Necessary that the residual ridge be used to assist in the functional stability of the prosthesis.Tooth-tissue supported
TOOTH SUPPORTED(Movement Potential):Less
TOOTH SUPPORTED(design consideration):less variable
TOOTH SUPPORTED(primary support):abutment teeth
TOOTH SUPPORTED(secondary support):abutment teeth
TOOTH SUPPORTED(indirect retainer):none
TOOTH SUPPORTED(base material):metal
TOOTH SUPPORTED(direct retainer):clasp
TOOTH-TISSUE SUPPORTED(movement):more prone
TOOTH-TISSUE SUPPORTED(design):more complex
TOOTH-TISSUE SUPPORTED(primary support):Residual ridge and tissue underlying the denture base
TOOTH-TISSUE SUPPORTED(secondary support):abutment teeth
TOOTH-TISSUE SUPPORTED(indirect retainer):present
TOOTH-TISSUE SUPPORTED(base material):generally acrylic resin
TOOTH-TISSUE SUPPORTED(direct retention):wrought wire or bar type retentive arms
Flat ridge provides ____ support, ____ stabilitygood; poor
Sharp, spiny ridge, provides ____ support, ____ stabilitypoor; poor to fair
Displaceable tissue on the ridge provides ___ support, ___ stabilitypoor; poor
Retainer: Engages an abutment tooth to resist displacement of the prosthesis away from basal seat tissuedirect
Where direct retainer abutment attachesPrimary abutment
Where indirect retainer attachment attachesSecondary Abutment
TYPES OF DIRECT RETAINERS:Vertical walls built into the crown of the abutmentINTRACORONAL
TYPES OF DIRECT RETAINERS:Casted or attached totally within the restored natural contours of the abutmentINTRACORONAL
TYPES OF DIRECT RETAINERS:Composed of prefabricated machines key and keywayINTRACORONAL
INTRACORONAL RETAINERS ARE ALSO KNOWN ASinternal attachemnt, precision attachment, key and keyway
TYPES OF DIRECT RETAINERS:Not usually used in distal extension; causes tipping of abutment teethINTRACORONAL
TYPES OF DIRECT RETAINERS:Mechanical retention comes from the outer surfaceExtracoronal
TYPES OF DIRECT RETAINERS:Most widely used direct retainerExtracoronal
TYPES OF DIRECT RETAINERS:Clasp type retainer is the most common form usedExtracoronal
Requirements of Clasp Assembly:supplied by primary claspRetention
Requirements of Clasp Assembly:responsible in opposing the lateral forces and stresses that are exerted by the retentive arm to the abutment teethReciprocation
Requirements of Clasp Assembly:provides stability; resists horizontal forcesBracing
Requirements of Clasp Assembly:to oppose gingival movement or tissueward movement of dentureSupport
CLASP ASSEMBLY(function): restSupport
CLASP ASSEMBLY(function): minor connectorstabilization/bracing
CLASP ASSEMBLY(function): reciprocal armReciprocation
CLASP ASSEMBLY(function): retentive armStabilization/Bracing/Retention
CLASP ASSEMBLY(location): restOcclusal, lingual, incisal
CLASP ASSEMBLY(location): Minor Connectorlingual surface; Above or on the survey line
CLASP ASSEMBLY(location): retentive armbuccal; shoulder: apical portion of middle third; terminal end: undercut
CLASP ASSEMBLY: reciprocal arm shaperounded end, straight
CLASP ASSEMBLY: retentive arm shapetapering
CLASP ASSEMBLY: what is provided by the shoulder in retentive armStabilization and bracing
CLASP ASSEMBLY: what is provided by the terminal end in retentive armRetention
shape of restrounded triangular
TYPES OF EXTRACORONAL RETAINER:Considered as an all-cast claspCircumferential Clasp
TYPES OF EXTRACORONAL RETAINER: indicated on almost all tooth-supported partial dentures because of retentive and stabilizing abilityCircumferential Clasp
TYPES OF EXTRACORONAL RETAINER: contraindicated when the retentive undercut may be approached better by a bar clasp arm or when esthetics is better in using a bar claspCircumferential Clasp
a disadvantage of Circumferential Clasp: more metal may be displayed in the __________-mandibular arch
Circumferential Clasp: arms2 (retentive, reciprocal)
Circumferential Clasp: rest1 (MO/DO)
TYPES OF EXTRACORONAL RETAINER: indicated When a proximal undercut cannot be approached by other meansRing Clasp
TYPES OF EXTRACORONAL RETAINER:may be used in reverse on an abutment located anterior to a tooth-bounded edentulous space when a distobuccal or distolingual undercut cannot be approached directly from the occlusal rest area and/or tissue undercuts prevent its approachRing Clasp
TYPES OF EXTRACORONAL RETAINER: contraindicated when Excessive tissue undercuts prevent the use of a supporting strutRing Clasp
TYPES OF EXTRACORONAL RETAINER: advantages include; Excellent bracing with supporting strut, Allows the use of an available undercutRing Clasp
Ring Clasp: arms1 (retentive)
TYPES OF EXTRACORONAL RETAINER: no reciprocal arm (replaced by the supporting strut)Ring Clasp
Ring Clasp: rest2 (primary, auxiliary)
TYPES OF EXTRACORONAL RETAINER:Two opposing circumferential clasps joined at the terminal end of the two reciprocal armsMultiple Clasp
TYPES OF EXTRACORONAL RETAINER: indicated when When additional retention or stabilization is needed; usually on tooth-supported RPDMultiple Clasp
TYPES OF EXTRACORONAL RETAINER: indicated May be used for multiple clasping in instances in which the RPD replaced an entire half of the archMultiple Clasp
TYPES OF EXTRACORONAL RETAINER: indicated when May be used in place of embrasure clasp when the only available retentive areas are adjacent to each otherMultiple Clasp
TYPES OF EXTRACORONAL RETAINER: contraindicated when Two embrasure approaches are necessary rather than a single common embrasure for both claspsMultiple Clasp
Multiple Clasp: arms4 (2 retentive, 2 reciprocal)
Multiple Clasp: rest2
TYPES OF EXTRACORONAL RETAINER:little justificationHalf and Half Clasp
TYPES OF EXTRACORONAL RETAINER:Consists of a circumferential retentive arm arising from one direction and a reciprocal arm from a different directionHalf and Half Clasp
TYPES OF EXTRACORONAL RETAINER:Second arm arises from a second minor connector; with or without auxiliary occlusal restHalf and Half Clasp
TYPES OF EXTRACORONAL RETAINER:Also known as hairpinReverse Action Clasp
TYPES OF EXTRACORONAL RETAINER: indicated When a proximal undercut must be used on a posterior abutment and when tissue undercuts, tilted teeth, or high tissue attachments prevent the use of a bar clasp armReverse Action Clasp
TYPES OF EXTRACORONAL RETAINER: indicated When lingual undercuts may prevent the placement of a supporting strut without tongue interferenceReverse Action Clasp
TYPES OF EXTRACORONAL RETAINER:Clasp arm is designed to permit engaging a proximal undercut (undercut adjacent to edentulous space) from an occlusal approach.Reverse Action Clasp
TYPES OF EXTRACORONAL RETAINER:Esthetically objectionable when used on anterior abutmentReverse Action Clasp
TYPES OF EXTRACORONAL RETAINER:The clasp covers considerable tooth surface and may trap debrisReverse Action Clasp
Reverse Action Clasp: rest1
Reverse Action Clasp: retentive portion begins beyond the ___turn
Reverse Action Clasp: the bend that connects the upper and lower parts of the arm should be ___ to prevent stress accumulation and fracture of the arm at the bendrounded
TYPES OF EXTRACORONAL RETAINER: for Unmodified Class II or Class III cases with no edentulous spaces on the opposite side of the archEmbrasure Clasp
TYPES OF EXTRACORONAL RETAINER: contraindicated for Insufficient space in between abutment teethEmbrasure Clasp
TYPES OF EXTRACORONAL RETAINER:Historically demonstrates a high percentage of fracture caused by inadequate tooth preparationEmbrasure Clasp
TYPES OF EXTRACORONAL RETAINER:Preparation of adjacent, contacting, uncrowned abutments are difficult in adequate interproximal bulk claspsEmbrasure Clasp
Embrasure Clasp: arms4 (2 retentive, 2 reciprocal)
Embrasure Clasp: rest2
Embrasure Clasp: ______ can substitute a circumferential reciprocal arm, as long as there is definite reciprocation and stabilizationAuxiliary occlusal rest or a bar clasp
TYPES OF EXTRACORONAL RETAINER:Modification of the ring claspBack Action Clasp
TYPES OF EXTRACORONAL RETAINER:indicated on a premolar abutment anterior to the edentulous spaceBack Action Clasp
Back Action Clasp: arm1( both retentive and reciprocal)
Back Action Clasp: rest1
TYPES OF EXTRACORONAL RETAINER:Class I and Class IIRest Proximal Plate I-Bar
TYPES OF EXTRACORONAL RETAINER: indicated for Class I and Class II; Undercut located adjacent to edentulous areaRest Proximal Plate T-Bar
TYPES OF EXTRACORONAL RETAINER: contraindicated for Severe soft tissue undercut, Height of contour located near occlusal surfaceRest Proximal Plate T-Bar
TYPES OF EXTRACORONAL RETAINER:mesioocclusal rest with the minor connector placed into the mesiolingual embrasure, but not contacting the adjacent toothRest Proximal Plate I-Bar
TYPES OF EXTRACORONAL RETAINER:A distal guiding plane, extending from the marginal ridge to the junction of the middle and gingival thirds of the abutment tooth; ready to receive a proximal plateRest Proximal Plate I-Bar
Rest Proximal Plate I-Bar: The _____, in conjunction with the minor connector supporting the rest; provides the stabilizing and reciprocal aspects of the clasp assemblyproximal plate
TYPES OF EXTRACORONAL RETAINER:Equivalent of T-bar; for canines and premolars; mesial and distal projection terminate near occlusal surfaceRest Proximal Plate Y-Bar
TYPES OF EXTRACORONAL RETAINER:No retentive horizontal projection; Class I and Class IIRP-Modified T-Bar
TYPES OF EXTRACORONAL RETAINER:For canines and premolarsRP-Modified T-Bar
TYPES OF EXTRACORONAL RETAINER:indicated for Undercut located near adjacent edentulous areaRP-Modified T-Bar
Resists rotational movement of the dentureINDIRECT RETAINERS
INDIRECT RETAINERS usually comes in the form ofrest
Types of indirect retainers:Not part of clasp assembly; Singular rest found at the occlusal for additional support but not part of clasp assemblyAuxiliary occlusal rest
Types of indirect retainers:Usually placed in maxillary canines; cingulum is more prominent, easier to prep rest seatCingulum rest
In cases where you have to use the mandibular canine for cingulum rest, just do ______; the slope is more steep in mn canine than mx canineincisal rest
Types of indirect retainers:Placed on incisal surface of incisorsIncisal rest
Types of indirect retainers:Occlusal rest of premolars can be extended into cingulum area of caninesCanine extension from occlusal rest
Where the denture rotates; An imaginary line passing through 2 primary abutmentsFULCRUM LINE
Indirect retainers, when indicated, should be placed ___ degrees from the fulcrum line45
Rotational movement due to fulcrum should be counteracted byindirect retainers