Modification of tooth contours for removable partial dentures, part I: Non-invasive techniques

Abstract

The contours of natural teeth are usually unsuitable to meet the requirements for the proper placement and functioning of an RPD. For that reason the teeth selected as abutments for RPD have to be modified. If the changes needed can be accomplished within the confines of tooth enamel, the procedures are referred to as tooth modifications or tooth alterations. There are many requirements for RPD frameworks that necessitate some form of tooth alteration. These alterations depend on the design of RPD framework and the shape of the teeth, as well as the chosen path of insertion and path of placement. The modifications needed to meet these requirements are: alteration of tooth structure to prepare rest seats, selective grinding to improve or provide guiding planes, selective grinding to provide stabilization and reciprocation against the action of the retentive arm and vestibule surface recapturing in order to enable undercuts with composite. Taking these requirements into consideration the basic aim of this paper is to emphasize, describe and explain all tooth alterations for RPD frameworks.

Oblici prirodnih zuba, najčešće, nisu prihvatljivi za elemente PSP. Zbog toga većina zuba predviđenih za sidrenje PSP mora biti modifikovana. Ako promena oblika retencionih zuba zahteva minimalne korekcije, procedure kojima se one ostvaruju svrstavaju se u grupu neinvazionih metoda. Postoje mnogi zahtevi za izradu PSP koji uslovljavaju pripremu retencionih zuba. Priprema retencionih zuba zavisi, dakle, od dizajna PSP, oblika preostalih zuba i odabranog pravca unošenja proteze. Priprema retencionih zuba za prihvatanje elemenata PSP obuhvata: pripremu ležišta za okluzalne i lingvalne naslone, formiranje vodećih ravni, preoblikovanje oralnih i vestibularnih površina retencionih zuba. Uvažavajući ove zahteve osnovni cilj ovog rada je da istakne, opiše i objasni pripremu retencionih zuba za prihvatanje elemenata PSP.