Repair of fractured abutment teeth under pre-existing crowns: An alternative approach

Abstract

This article describes a technique for repair of abutment tooth which fractured during removal of a provisional restoration before bisque trial. The technique uses plastic templates to fabricate new composite core foundation for the existing crowns. This technique helps the dentist to rebuild the core in a single appointment.

A Simplified Technique for Retrofitting a Post and Core Foundation to a Pre-existing Crown: A Case Report

“…The repaired core should be placed exactly in the same location as the previous core. Slight change in core location may change the path of insertion of the crown Jeopardizing its adequate stability and retention [9]. The amount of remaining tooth structure appears to be of major importance, as the residual dentin helps in incorporating a ferrule.…”

“…Depending on the extent and severity of the fracture, retrofitting the crown on a fractured core may be a preferred option [4]. Nevertheless, the existing crown should fit precisely on the pre-existing finish line [9].…”

A Simplified Technique for Repair an Abutment Tooth under Preexisting Crown: A Case Report

“…Glass and quartz-fiber reinforced dowel systems compared to casted post and core have elastic moduli comparable to that of dentin [14]. Using the intaglio surface of the pre-existing crown fitted with dual cure composite allows the core to be placed exactly in the same location as the previous core because slight change in core location may change the path of insertion of the crown compromising its adequate stability and retention [9]. This technique compared to the technique using of a vacuum-formed thermoplastic template adapted to the PVS putty index obtained from the inner aspect of the crown [8] is more accurate, because there is no chance Corso, et al and Kambhampati, et al studied the effect of temperature changes (ranged from 4°C to 40°C and 25°C, 37°C, and 42° respectively) on the dimensional stability of PVS impression materials and found that though the changes in storage temperature had a statistically significant effect on the dimensional stability [15,16].…”

“…Using the retrofitting technique for fractured already restored abutment may be as a preferred option [8] whereas, the existing crown should fit precisely on the pre-existing finish line [9].…”

“…Two coats of the bonding material (Prime and Bond NT, Dentsply) were applied to the tooth surface coronally to the finish line and lightpolymerize for 20 seconds and then applied again in the post space. A prefabricated light post (D. T. Light-Posts; Bisco Inc. Illinois, USA) of appropriate size was adhesively cemented using dual-cure resin cement (Duoloink, BiscoInc, Schaumburg, USA) (Figure 6)[9].…”