RETAINERS IN FPD
🎯 KEY POINTS:
🔸Retainers are the part of an FPD that attaches to the abutment teeth.
🔸They provide retention and support for the pontic.
🔸Types include full crowns, partial veneer crowns, and resin-bonded retainers.
🔸Full crowns cover the entire clinical crown of the abutment tooth.
🔸Partial veneer crowns cover only a portion of the clinical crown.
🔸Resin-bonded retainers are bonded to the tooth surface with adhesive resin.
🔸Selection of retainer type depends on factors like tooth structure, esthetics, and occlusion.
🔸Proper preparation of the abutment teeth is crucial for retainer success.
🔸Retainers must be designed to withstand occlusal forces and prevent dislodgement.
🔸Well-designed retainers contribute to the long-term success of an FPD.
🔍 DEFINITION: Any type of device used for the stabilization or retention of prosthesis. (GPT 8th Ed)
🔎 FACTORS REQUIRED FOR IDEAL RETAINER:
🔺Retention qualities
🔺Strength
🔺Biological factors
🔺Aesthetic factors
🔺Ease
🔎 CLASSIFICATION OF RETAINERS
✳️ On the Basis of Location
🔻Class I: Extracoronal retainers
🔻Class II: Intracoronal retainers
🔻Class III: Radicular retainers
✳️ On the Basis of Type of Material Used
🔻All ceramic
🔻All metal
🔻Metal–ceramic
🔻All acrylic
📢 Extracoronal Retainers
✴️ Two types of extracoronal retainers, which are:
(i) Full veneer crown
(ii) Partial veneer crown
📢 Intracoronal Retainers
✴️ Types of intracoronal retainers :
(i) Proximo-occlusal inlay
(ii) MOD onlay
🔎 SELECTION OF RETAINERS
🔺Condition of the abutment tooth/teeth or implant
🔺Functional relation of adjacent gingival tissues
🔺Available interocclusal space
🔺Presence and extent of caries
🔺Material used for pontic
🔺Morphology of the crown of the abutment
🔺Periodontal condition
🔺Length of edentulous span
🔺Position of the tooth
🔺Occupation, age and sex of the patient