gtc 8 - pontics (ppsg lectures)

7/28/2019 GTC 8 - PONTICS (Ppsg Lectures)

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FIXED PROSTHODONTICS

DR. ERWAN SUGIATNO

DR HARYO M.DIPOYONO

PUSAT PENGAJIAN SAINS PERGIGIAN

UNIVERSITI SAINS MALAYSIA


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PONTICS

The pontic, or artificial tooth is a bridge of afixed partial denture

It is not a simple replacement, because placingan exact anatomic replica of the tooth in the

space would be hygienically The design will be dictated by esthetics,

function, ease of cleaning, maintenance of

healthy tissue on the edentulous ridge, andpatient comfort

Pontics may be metal-ceramic, cast metal, orresin processed to metal.


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Tissue Contact : The area of contact between the pontic and the

ridge should be small and the portion of thepontic touching the ridge should be as convex aspossible.

If there is contact along the gingivofacial angle ofthe pontic, there must be no space betweenpontic and soft tissue on the facial side of theridge.

If the tip of the pontic extends past themucogingival junction, an ulcer will form there

The pontic should contact only attached

keratinized gingiva.


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Pontic Designs :

There are several designs available for our

use in situations requiring pontics in the

fabrication of fixed partial dentures.

These include : saddle (ridge lap), modified

ridge lap, hygienic, conical, ovate,

prefabricated pontic facing, and metal-

ceramic pontics.


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Saddle : This pontic look most like a tooth,

replacing all the contours of the missingtooth.

It form a large concave contact with theridge.

It is also called a ridge lap, because itoverlaps the facial and lingual aspects ofthe ridge.

This design has long been recognized asbeing unclean and uncleanable.


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A classic saddle, or ridge lap pontic.(A).

A linguogingival ridge (arrow), or

extension

past the crest of the ridge although

less severe,still constitutes a saddle (B)

Modified ridge lap pontics; A.maxillary; B. mandibular


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Modified Ridge Lap

The design gives the illusion of a tooth, but itpossesses all or nearly all convex surface forease of cleaning.

The lingual surface should have a slightdeflective contour to prevent food impactionand minimize plaque accumulation.

This design, with a porcelain veneer, is the most

commonly used pontic design in the appearancezone for both maxillary and mandibular fixedpartial dentures.


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Hygienic

The term hygienic is used to describe pontics that

have no contact with the edentulous ridge This pontic design is frequently called a sanitary

pontic

This pontic is used un the non appeareance zone,particularly for replacing mandibular first molars

The occlusogingival thickness of the pontic should

be no less than 3.0 mm, and there should beadequate space under it to facilitate cleaning.


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Conical

This pontic is rounded and cleanable

It is well suited for use on a thinmandibular ridge

Its use is limited to replacement of teeth

over thin ridges in the non appearancezone

Conical pontic used correctly with a thin ridge(A). And incorrectly with a broad, flat ridge

(B). Arrows indicate debris-trapping embrasure


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Ovate The ovate pontic is around-end design

currently in use where esthetics isprimary concern.

The tissue contacting segment of the

ovate pontic is bluntly rounded, and it is

set into a concavity in the ridge.

gtc 8 - pontics (ppsg lectures)

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