Crown & Bridge Department

Gold Inlays / Onlays, Full & 3/4 Gold Crowns

Gold Inlays/Onlays, Full & 3/4 Gold Crowns

When preparing (trimming) a tooth for dental crown placement, comparatively less tooth reduction is needed for a full or 3/4 gold crown as opposed to a porcelain-fused-to gold crown or (almost all types of) all-ceramic crowns. This is because crown strength is a consideration involved. Because dental golds are strong, only about 0.5 mm's of crown thickness is required. In comparison, most porcelain-surface crowns require 2 mm's or more.

Porcelain Crowns

Teeth that demonstrate extensive damage can be restored or optically enhanced with porcelain crowns. When constructing a porcelain crown the initial stage involves the fabrication of a substructure to strengthen the crown. The substructure can be constructed in either gold, zirconia or lithium disilicate. Every patient situation presents its own requirements and objectives.

Building Dental Ceramics With A Brush

The substructure is coated with a veneering ceramic which is painstakingly built to form with a brush by the dental ceramist. The artistic building process involves sophisticated segmental layering techniques and complex procedure. When the layers of ceramic have been built, they are placed in a computerized furnace, where they are fired at 900 degrees celsius approximately, under vacuum pressure.

Dental Bridge Types

Fixed/Fixed Bridge

If entire teeth are missing they can be replaced with a Fixed/Fixed bridge. The Fixed/Fixed bridge has one or more replacement teeth (called pontics.) The pontics are attached to dental crowns (called abutments). The abutments are cemented onto the supporting teeth that have been prepared to support the bridge. Fixed/Fixed bridges can vary depending on how many teeth are missing. They can be used anywhere in the mouth provided you have natural teeth or implants on either side of the missing tooth or teeth.

Cantilever Bridge

A Cantilever bridge is similar to a Fixed/Fixed bridge, although the pontic is supported by an abutment on one side only, rather than on both sides.

Maryland Bridge

A Maryland bridge consists of one or more porcelain pontics. Thin cobalt-chrome or gold onlays are attached on either side. The onlays are secured to the surfaces of the adjacent teeth with a composite bonding resin. A Maryland bridge is considered durable, minimally invasive and conservative of tooth tissue.

Geometrical Crowns

Geometrical crowns are constructed in combination with milled cobalt-chrome
partial denture frames. The purpose of the Geometrical crown is to retain the milled
cobalt-chrome removable partial denture frame. The design geometry includes milled guide
planes on several surfaces with a deliberate flat convexity on the buccal surface. An approximate
2 mm concavity is included below the convexity. This surface will retain the flexible portion of the
clasp arm tip, that is attached to the milled cobalt-chrome frame.

Geometrical crowns are constructed in combination with milled cobalt-chrome removable partial denture frames. The purpose of the Geometrical crown is to retain the milled cobalt-chrome removable partial denture frame. The design geometry includes milled guide planes on several surfaces with a deliberate flat convexity on the buccal surface. An approximate
2 mm concavity is included below the convexity. This surface will retain the flexible portion of the clasp arm tip, that is attached to the milled cobalt-chrome frame.

Articulation/Occlusion

The Denar Instrument System is used to establish the specifications or measurements to which the restoration is to be completed.

The “drop wax” or functional waxing techniques consist of adding wax in an orderly step by step procedure; building up the occlusal anatomical form element upon element in a logical fashion.

Yellow wax cones | Green wax triangular ridges | Blue wax marginal ridges.

The Denar Instrument System is used to establish the specifications or measurements to which the restoration is to be completed.

The “drop wax” or functional waxing techniques consist of adding wax in an orderly step by step procedure; building up the occlusal anatomical form element upon element in a logical fashion.

Yellow wax cones | Green wax triangular ridges | Blue wax marginal ridges.

Scientific Dental Arts
Main Street
Dunleer
County Louth
Ireland

T: +353 (0)41 686 1111

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