Download - GTC 8 - PONTICS (Ppsg Lectures)
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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.