Why PrepSure

PrepSure is used to confirm that the proper amount of reduction has been performed on crown abutments—neither insufficient nor over-reduction—to avoid necessitating metal occlusion and prevent premature crown breakage. This, in turn, maximizes the longevity of the crowns and prevents hypersensitivity after crown seating. 
During the abutment preparation, PrepSure should be used periodically to confirm adequate reduction of tooth structure.
As an example, this patient presented with a Porcelain Fused to Metal crown on tooth #14 that showed significant loss of the porcelain exterior. Additionally, recurrent decay was noted under the crown. After discussing options with the patient, a new crown made of solid zirconia was recommended, and it was accepted by the patient.
The old, damaged crown was cut and removed, and the occlusal clearance on the abutment was checked with the 1.0 mm PrepSure instrument. I found that more reduction was needed. During the additional reduction, the 1.0 mm PrepSure was used frequently in order to confirm the point at which adequate occlusal clearance had been attained. This method of monitoring and confirming clearance during reduction also helped to avoid over-reduction, preserving the patient’s own tooth structure as much as possible.

Fig.1
1.0 mm PrepSure is used to check the occlusal clearance on the mesial half of the prep.  

Fig.2
1.0 mm PrepSure is used to check the occlusal clearance on the distal half. 

Fig.3
Before cementation, the proximal contacts of the new crown were adjusted  using the Black Diamond Strip, enabling the complete marginal seating of the crown.  

Fig.4
After cementation, some cement remnants were found and subsequently removed using the White Serrated Strip (The Gentle Saw, Interproximal Cement Cleaner, 0.035mm • Double-Serrated), and the restoration was polished using Gray Final Polishing Strip (The Proximal Surface Polisher, 0.05mm • Ultra-Fine Diamond • Single-Sided).