Fixed Partial Dentures Flashcards
what is a dental bridge?
supports artificial tooth on one or both sides of the abutment
What is a pontic?
the suspended part of the bridge that replaces a missing natural tooth
what is an abutment?
the prepared tooth or implant-retained post that supports the bridge
what is a retainer in a bridge?
the crown or partial crown that supports the pontic
what is a connector?
the section that joins the unit (retainer and pontic) together
what is a pier?
the intermediate abutment used as a centre support in a long span bridge
what are the types of dental bridges?
fixed-fixed bridge
fixed-movable bridge
cantilever bridge
spring cantilever bridge
maryland or minimum preparation bridge
what are the characteristics of a fixed-fixed bridge?
rigid support, strong and retentive, single or multiple pontics
what are the potential drawbacks of a fixed-fixed bridge?
parallel abutments are required and lack of independent movement
what are the characteristics of fixed-movable bridge?
rigid support and movable joint, conservative tooth structure and suitable for divergent or nonparallel abutments
what are the advantages of fixed-movable bridge?
stress breaking and conservative preparation
what are the disadvantages of fixed-movable bridge?
time-consuming, increased expense, temporary bridge preparation
what are the characteristics of cantilever bridge?
pontic is supported on one or more abutment teeth, conservative design, abutment carries occlusal load, protection against rotational forces
what are the recommendations of cantilever bridge?
use of two abutments, limitation to one or two units
what are the potential issues of cantilever bridge?
potential rotations
what are the design rules of spring cantilever bridge?
rigid bar, no post dam or bead lines, highly polished fitting surface, 4mm wide bar, no contact with gingival tissues
what are the clinical applications of spring cantilever bridge?
ideal for replacing anterior tooth with diastema, but can have potential discomfort
what are the characteristics of maryland bridge?
thin retainer wings, design variations, minimally invasive
what are the potential issues of maryland bridge?
debonding and not suitable for certain conditions (severe tooth wear, parafunction or insufficient interocclusal clearance)
what are advantages of implant-supported bridge?
aesthetics, maybe retrievable, no tooth preparations, preservation of exisiting bone
what are the disadvantages of implant-supported bridge?
prohibitive cost, time-consuming clinical and laboratory procedures, gingival aesthetics can be difficult
how to make the strength of the framework better?
proper design, material (alloys, ceramics and polymers), health and position of abutment teeth
what selection of abutment teeth are used?
ante’s law, crown/root ratio, root configuration, periodontal ligament area
what is the optimum crown:root ratio?
1:2, minimum being 1:1
what type of retainers can be used?
full crowns, 3/4 crown, post and cores, modified class 3 or 4 inlays (with pins), wings
