Surface Integrity of Dental Ceramics Post Resin-Cement Removal by Burning Technique

Bruna Vallerini, Natalie Pesun, Igor Pesun, Rodrigo França

University of Manitoba, Department of Restorative Dentistry, Winnipeg, Canada

INTRODUCTION

The necessity to remove resin-cement from the intaglio surface of dental crowns before re-cementation is a common clinical challenge. The burning technique, which involves burning off the cement, has been suggested for this purpose. However, the impact of this technique on the surface properties of ceramics remains unclear [1]. 

AIM

This study aimed to evaluate the effects of the burning cements off on the surface properties of zirconia and lithium disilicate dental ceramics, particularly analyzing mechanical properties, including hardness and elastic modulus. 

MATERIAL AND METHOD

RESULTS

The burning technique effectively removed residual resin-cement from the ceramic samples. FTIR analysis confirmed no significant chemical residue post-treatment (Figure 7). Additionally, no significant differences in the hardness and elastic modulus of the ceramic surfaces were observed before and after the burning technique (Graphs 1 and 2). 

SEM images revealed differences in surface quality between lithium disilicate (LS) and zirconia samples post-burnout. The LS surfaces appeared smoother, potentially due to residual cement, but changed after hydrofluoric acid and silane primer treatment, showing a micro-retentive surface. In contrast, the zirconia samples displayed a rougher surface, suggesting more complete resin-cement removal during burnout, exposing the air-abraded layer underneath (Figures 8 and 9).

CONCLUSION

The study concludes that the burning technique is an effective and viable clinical method for removing resin-cement from dental ceramic surfaces without compromising their mechanical properties, making it a suitable option for re-cementation procedures.

REFERENCES