A circumferential clasp is a curved metal clasp used on a removable partial denture (RPD) to help it stay in place. It “wraps around” part of a tooth and engages a small undercut (a slight inward curve) for retention. It is commonly used on back teeth (premolars and molars) that act as abutment teeth for an RPD. You may also hear it called an *Akers clasp* in many traditional designs.
An Akers clasp is a classic metal clasp design used on removable partial dentures (RPDs). It wraps around part of a tooth to help the denture stay in place during chewing and speaking. It is most commonly a cast “circumferential” clasp with a retentive arm and a reciprocal arm. Dentists and dental technicians use it as part of a broader RPD framework design.
A clasp is a curved component that helps a removable dental appliance stay in place. It most commonly refers to the retentive element on a removable partial denture (RPD). A clasp gently engages a natural tooth to resist dislodgement during speaking and chewing. It is designed to balance retention with tooth and gum health.
A direct retainer is a fixed orthodontic retainer bonded to teeth directly in the mouth. It is commonly a small wire or fiber placed on the tongue-side (lingual) surfaces of front teeth. It helps maintain tooth alignment after orthodontic treatment or minor tooth movement. It is typically placed chairside using dental bonding materials and a curing light.
An indirect retainer is a fixed orthodontic retainer that is bonded to teeth using an indirect placement method. It is commonly used after braces or aligners to help maintain tooth alignment and reduce relapse. The retainer is typically made on a model or digital design and transferred to the mouth with a tray or jig. It is most often placed on the tongue-side (lingual) surfaces of front teeth.
A cingulum rest is a small supporting component used in removable partial dentures (RPDs). It sits on the cingulum area, the raised “bump” on the tongue-side of front teeth (usually canines, sometimes incisors). Its job is to help support the denture and control how it moves during chewing and speaking. It is most commonly discussed in prosthodontics and RPD design.
occlusal rest is a term some people use to describe a tooth-colored filling placed on the chewing surface of a back tooth. It commonly refers to restoring pits, grooves, or small areas of decay on molars and premolars. In formal prosthodontic terminology, “occlusal rest” can also mean a support component for a removable partial denture, so wording may vary by clinician and context. This article focuses on occlusal rest as an occlusal (chewing-surface) restoration typically made with resin composite.
A rest seat is a small, shaped area that a dentist prepares on a tooth to support a “rest” on a removable partial denture (RPD). In plain terms, it is a shallow cradle that helps a denture sit in the right place and carry chewing forces on teeth rather than soft tissues. rest seat preparation is most commonly discussed in partial denture design, especially on back teeth (occlusal rests) and certain front teeth (cingulum rests). It is a planned feature of prosthodontic treatment, not a disease or a filling material.
A minor connector is a small but essential part of a removable partial denture (RPD) framework. It links the major connector (the main “backbone” of the denture) to other components like rests, clasps, and the denture base. In simple terms, it acts like a connector “bridge” that transfers support and stability across the prosthesis. It is most commonly discussed in prosthodontics and RPD design.
A major connector is the main metal or resin framework component in a removable partial denture (RPD). It joins the left and right sides of the denture so the parts act as one unit. It commonly sits across the palate (upper jaw) or along the inside of the lower jaw behind the teeth. Its design is chosen to balance strength, comfort, and support for missing teeth replacement.