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Overdenture

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Anchoring an overlay denture to retained roots enhances denture stability and provides numerous functional advantages. Radicular Stud Overdenture Attachments are available with both rigid or resilient function. Due to compromised periodontal support, resilient designs, such as the ERA®, are more commonly used. Bars splint two or more natural abutments or implants. Attachment function can be rigid or resilient, depending on the bar chosen and on the case design. Intraradicular anchors feature their point of connection inside the root. Because of this they are most often used when bone support is very limited. The following are general guidelines that may be used to help you to decide on which attachment might be best for a particular situation. They are based on 80 years of experience with dental attachments, but the final choice must be based on the particular dentist's philosophy, education, and experience. In most cases teeth to retain overdentures are reduced, approximately to the height of the gingival tissue. The endodontic procedures are completed and any periodontal problems are resolved before the prosthetics begin. If the bone loss is 50% or greater, then the prognosis for these roots is relatively poor. An intraradicular anchor (Stern Root Anchor) will provide the least amount of lateral force to these roots, and therefore, would be the best choice. If the bone loss is in the 50% or less category, radicular studs or bars can be used. Your choice will depend on your philosophy. For many years the conventional wisdom was, splinting abutments with bars made them stronger. Studies done at UCLA and other places have contradicted this opinion. The more recent body of information would tend to indicate that there is less force to the roots or implants from a resilient free standing attachment than when they are connected with a bar. Proper Measurements for Attachments

Sterngold works hard to make using attachments easy for you. In this catalog, we provide our best advice on space requirements based on extensive practical experience.

Each attachment description lists the minimum space required for placement of the attachment, to assure a high rate of success and long-term function. Allowance is already made for restorative materials, such as dental casting alloys or denture acrylic, surrounding and holding the attachment component. With this information you can measure a study cast and decide if an attachment can be used in the available space.

These allowances are:

• Denture acrylic thickness occlusal to extracoronal attachment components, bars and overdenture attachments (influences Height), 1mm

• Denture acrylic thickness lateral to attachment components (influences Removable Component Width), 1mm on each side.

• Casting alloy thickness between a box preparation axial wall and a metal, intracoronal, precision attachment female (influences Prep Depth), 0.4mm

• Casting alloy thickness for root cap coping (influences Height), 0.5mm.

Working with Metal Attachments

Depending on the attachment's design, metal components are anchored in denture acrylic, soldered to a casting, or invested along with a wax pattern and cast against with a dental alloy. Use an alloy with a casting temperature at least 100°F (40°C) below the lowest value of the component's melting range when casting against an attachment component.

Melting Ranges of Attachments

Ceramacast components
Degrees F: 2600-2760
Degrees C: 1425-1515

Ceramicor components
Degrees F: 2550-2715
Degrees C: 1400-1490

Doral components
Degrees F: 1705-1860
Degrees C: 930-1015

Elitor components
Degrees F: 1615-1725
Degrees C: 880-940

Iridium-platinum components
Degrees F: 3300-3360
Degrees C: 1820-1850

NPS components
Degrees F: 2700-2850
Degrees C: 1480-1565

OSV components
Degrees F: 1885-2010
Degrees C: 1030-1100

Set Descending Direction

Items 1 to 12 of 465 total

Set Descending Direction

Items 1 to 12 of 465 total