| The goal is to provide _____________ by striving to understand how to maximize every opportunity for _______ a stable prosthesis | useful, functional removable partial denture prostheses; providing and maintaining |
| Consequences of denture movement under load: | Stress to the abutments and tissue in contact with the prosthesis |
| In designing RPD: goal | provide and maintaining a stable prosthesis: |
| Most common movement encountered in RPD is the | lever |
| CLASSIFICATION OF LEVERS:Most common type of lever in distal extension | CLASS I/ “Seesaw |
| CLASSIFICATION OF LEVERS:R (direct retainer) F (fulcrum = rest) E (occlusal load applied) | CLASS I/ “Seesaw |
| CLASS I/ “Seesaw:Movement towards the | tissue |
| CLASSIFICATION OF LEVERS:Movement is away from the tissue (dislodgement) | CLASS II/ “Wheel barrow” |
| CLASSIFICATION OF LEVERS:Direct retainer at the middle, posterior to the fulcrum. E at the posterior | CLASS II/ “Wheel barrow” |
| CLASSIFICATION OF LEVERS:Stability of denture; Effort at the middle-2 stable component | CLASS III/ “Fishing pole” |
| POSSIBLE MOVEMENT OF A PARTIAL DENTURE: Movement from front to back | Rotation about an axis (fulcrum) through the most posterior abutment |
| Rotation about an axis (fulcrum) through the most posterior abutment: Vertical tissue ward movement is resisted by | residual ridge, accuracy of the fit of the denture base, Total amount of occlusal load applied |
| POSSIBLE MOVEMENT OF A PARTIAL DENTURE: Moves left to right or buccally to lingually | Rotation about a longitudinal axis as the distal extension base moves in a rotary direction about the residual ridge. |
| Rotation about a longitudinal axis as the distal extension base moves in a rotary direction about the residual ridge: resists primarily by | Rigidity of the major and minor connector |
| POSSIBLE MOVEMENT OF A PARTIAL DENTURE: Resisted by stabilizing components such as reciprocal arms and minor connector | Rotation about as imaginary vertical axis near the center of the dental arch |
| Goals of designing RPD | Consideration of basic biomechanical principles, Oral hygiene, Appropriate prostheses maintenance |
| DESIGN PROCESS FOR REMOVABLE PARTIAL DENTURES: need | tooth replacement |
| DESIGN PROCESS FOR REMOVABLE PARTIAL DENTURES: definition of problem | Provision of stable removable prosthesis |
| DESIGN PROCESS FOR REMOVABLE PARTIAL DENTURES: objectives | Limited functional movement within tooth-tissue tolerance |
| DESIGN PROCESS FOR REMOVABLE PARTIAL DENTURES: background information | tissue load displacement character and potential; effects of prev dentuer |
| DESIGN PROCESS FOR REMOVABLE PARTIAL DENTURES: choice or solution | alternative based on learned principles and concepts |
| The rationale for design should logically develop from: | analysis of the unique oral condition of each mouth |
| Consideration of the forces inherent in the oral cavity is critical, what are these forces | direction, duration, frequency, and magnitude |
| capacity of oral structures to receive stresses without damage | physiologic tolerance |
| CLASS I/ “Seesaw arrangement | RFE |
| CLASS II/ “Wheel barrow”arrangement | ERF |
| CLASS II/ “Wheel barrow”arrangement | ERF |
| Tooth can resist movement but only have minimal amount of tooth movement | 0.25mm movement |
| six phases of partial denture service: | patient education; Diagnosis, treatment planning, design, treatment, sequencing and mouth preparation;Support for distal extension bases;Establishment and verification of oclusal relation and tooth arrangemnts;Inititial placment procedures; Periodic recall |
| six phases of partial denture service:Patient education; Secure | informed consent, patient cooperation and high level of patient compliance |
| six phases of partial denture service:evaluate what in periodic recall | fit (movement), functionality of denture, compliance of patient |
| the residual ridge can support __ of movement | 2mm |
| what happens to the tooth if a suprabulge is used on a distal extension case | mobility and tilting |
| since the rest is the fulcrum, what movement occurs posterior to the fulcrum? | downwards and forwards |
| since the rest is the fulcrum, what movement occurs anterior to the fulcrum? | upwards and backwards |
| torque is also called | bottle opening, wrenching or pump handle movement |
| first invented the RPI in 1963 | Frank Kratochvil |
| the RPI used to be called | I BAR SYSTEM |
| in Frank Kratochvil's system, where do we place the tip of the I bar? | mesiobuccal buldge |
| movement of I bar is | stress release |
| in 1973 the I bar system was modified by ____ | Arthur Krol |
| MINIMUM NUMBER OF RETAINERS: class I | 2 |
| MINIMUM NUMBER OF RETAINERS: class II | 3 |
| MINIMUM NUMBER OF RETAINERS: class III | 4 |
| MINIMUM NUMBER OF RETAINERS: class IV | 4 |
| first to use RPI | Arthur Krol |
| conceptualized a longer guideplane | Frank Kratochvil |
| conceptualized a shorter guideplane | Arthur Krol |
| advantages of Frank Kratochvil's concept | increase stability and promotes gingival health |
| Frank Kratochvil compensated the loss of reciprocation and loss of encirclement with a ___ | lengthening guide plate |
| what was eliminated with Kratochvil's invention | torque |
| Arthur Krol compensated loss of stability by | increasing encirclement |
| advantages of arthur krol's modification | less tooth reduction, improve retention |
