Dental Crowns

Dental Crowns

Dental Crowns
Synonyms : Jacket, Jacket Crown, Crown Restoration, Cap
A dental crown is a dental restoration that covers a tooth to restore it to its normal shape, size and function. Its purpose is to strengthen or improve the appearance of a tooth.

A dental crown can
– restore a tooth when there isn’t enough tooth remaining to provide support for a large filling
– attach a bridge to replace missing teeth
– protect weak tooth from fracturing
– restore a fractured tooth
– cover a badly shaped or discolored teeth
– cover a dental implant

Lithium disilicate jacket crown. Photo credit: Dr. Jesus Lecitona

Lithium disilicate jacket crown. Photo credit: Dr. Jesus Lecitona

What is it made from?
The look and function of a crown are considered when choosing the material ideal for your case.
Crowns are made from several types of materials: metal alloys, porcelain, composite resin, acrylic resin or combinations of these materials.

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How is affordable artificial gingiva made

How is affordable artificial gingiva made

The construction of Artificial gingiva begins by making an impression of labial surface of the bridge and ridge of the patient. Out of this impression, the dentist will pour a cast or model.

Unsatisfactory esthetics as a result of long pontics of the bridge on top of a resorbed  edentulous ridge.  – www.denturesaffordable.com

Unsatisfactory esthetics as a result of long pontics of the bridge on a very low edentulous ridge. – www.denturesaffordable.com

Master cast. – www.denturesaffordable.com

Master cast. – www.denturesaffordable.com

Wax up of artificial gingiva.– www.denturesaffordable.com

Wax up of artificial gingiva. – www.denturesaffordable.com

Wax gingiva will be made from the said model. Wax is melted and poured onto the labial surface of the model. After it hardens, the wax is carved to mimic the gums of the patient.

Simulation of gingival contour. – www.denturesaffordable.com

Simulation of gingival contour. – www.denturesaffordable.com

After excellent esthetics is attained, the wax artificial gingiva will be prepared for processing.

Investing of the wax pattern.  – www.denturesaffordable.com

Investing of the wax pattern. – www.denturesaffordable.com

Artificial gingiva is usually processed from 8 to 10 hours. Trimming and polishing of the processed gingiva will follow after deflasking.

Heat cure acrylic is mixed with dark shade modifier. – www.denturesaffordable.com

Heat cure acrylic is mixed with dark shade modifier. – www.denturesaffordable.com

Processed artificial gingiva. – www.denturesaffordable.com

Processed artificial gingiva. – www.denturesaffordable.com

Artificial gingiva after trimming and polishing.  - www.denturesaffordable.com

Artificial gingiva after trimming and polishing. – www.denturesaffordable.com

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Prosthodontic Reconstruction : Core Build-up

Prosthodontic Reconstruction : Core Build-up

If there’s enough coronal tooth structure to yield retention to a core build up, a post will not be necessary. The build up will fill the access cavity and other loss tooth tissue.

For core build-ups, a mechanical retention in addition to dentin bonding system should be placed to achieve maximum retention.

If the remaining tooth structure and the pulpal space support sufficient retention for the buildup, a post will not be needed and should be avoided.

Known advantages of build up without a post:

  • Additional weakening of the root is avoided.
  • Danger of root perforation is minimized.
  • Load transmission to the root is more uniform.
  • Fracture mode is more favorable in case of failure.
  • Salvaging of the tooth is more likely in case of failure.
  • Non-surgical retreatment is facilitated.
  • Costs for materials and treatment time are reduced.

In anterior teeth, the forces act in more horizontal direction and the cross section area is small, thus the insertion of post is necessary depending on the retention of core build up after tooth preparation.

Post space preparation

Post space preparation

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Fixed Bridge

Fixed Bridge

Metal Ceramic Bridge

An esthetic metal ceramic fixed partial dentures restoring the missing upper left first molar of a female patient. The restoration follows the four basic principles in esthetic dentistry: Anatomy, Emergence profile, Trigone principle, and Arrangement.

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Fixed Partial Denture Info

Fixed Partial Denture Info

Fixed Partial Prosthodontics Terms

Terms used in fixed partial dentures

Abutment is a tooth to which a bridge is attanched.

Retainer is a crown or other restoration that is cemented to the abutment. The terms retainer and abutment should not be confused or used interchangeably.

Pontic is an artificial tooth as part of a bridge.

Span is the space between natural teeth that is to be filled by the bridge.

Saddle is the area of the edentulous ridge over which the pontic will lie.

Pier is an abutment tooth standing between and supporting two pontics, each pontic being attached to a further abutment tooth.

Unit means either a retainer or a pontic. A bridge with two retainers and one pontic would therefore be a three unit bridge.

Connector connects a pontic to a retainer or two retainers to each other. Connectors maiy either be fixed or allow some movement between the components that they join.

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Esthetics in Fixed Partial Denture

Esthetics in Fixed Partial Denture

4 Units Zirconia Fixed Partial Denture

To achieve esthetic resotrations, prothodontists have to control factors such as tooth contour and anatomy, facial contours, upper and lower arches relationship, arch form, and color.

Fixed partial dentures are affected by the arrangement, size, shape and condition of teeth. Additional characteristics include: discolored non vital teeth, discolored vital teeth, short teeth, striated teeth, diastema, prominenet alveolar bone. occlusal balance, intermaxillary space, crowding and spacing.

There are basic principles to achieve esthetics in FPD. These are the following:
1. Anatomy.
2. Emergence profile.
3. Trigone principle
4. Arrangement.

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