Repair bond strength of aged resin composite using different surface treatments and bonding protocols


Main Article Content

Pydiahnaidu Bandaru
Nagesh Bolla
Rupadevi Garlapati
Sayesh Vemuri
Yamini Bandaru

Abstract

Background: Repair of direct composites are less invasive than replacement, diminishing the risk of iatrogenic exposure of the pulp and the risk of detrimental to adjacent teeth, all in all, reducing the procession of the “restoration death spiral”.


Aim: This study aimed to evaluate the repair bond strength of aged resin composites using different surface treatments and bonding protocols.


Materials and Methods: A total of 45 discs (n=45) were fabricated of Nanohybrid composite measuring about 2.5 mm in height and 3.5 mm in diameter and were mounted in acrylic resin and subjected to 10,000 thermal cycles between 5-55 ? C with 30 seconds of dwell time in a thermocycler in order to simulate artificial ageing. All these samples were assigned into three groups (n=15) based on the surface treatment protocol. According to the bonding protocol, the samples in each group are further divided into three subgroups (n=5). After surface treatments of the aged composites, the application of bonding agent followed by new composite material was performed. All the samples were stored in distilled water at 37 ? C for 24 hours. The shear bond strength of the samples was measured using a universal testing machine at a crosshead speed of 1mm/min.


Results: Among the groups, the mean bond strength in medium grain diamond bur and 37% phosphoric acid etchant with the universal bonding agent subgroup was higher 852.56±27.71 than the remaining groups. The lowest mean bond strength of 200.9±10.62 was observed in 37% Etchant with direct composite subgroup.


Conclusion: Different combinations of surface treatments and bonding protocols affect shear bond strength differently. The highest shear bond strength values were achieved for the group where surface treatment was done with the combination of blue diamond bur and 37% phosphoric acid along with a universal bonding agent.

Article Details


How to Cite
Bandaru, P., Bolla, N. ., Garlapati, R., Vemuri, S. ., & Bandaru, Y. . (2021). Repair bond strength of aged resin composite using different surface treatments and bonding protocols. International Journal of Dental Materials, 3(2), 51–57. https://doi.org/10.37983/IJDM.2021.3203
Author Biographies

Pydiahnaidu Bandaru, Sibar Institute of Dental Sciences

Senior Lecturer, Department of Conservative and Endodontics, Sibar Institute of Dental Sciences.

Nagesh Bolla, Sibar Institute of Dental Sciences

Professor and HOD, Department of Conservative Dentistry and Endodontics.

Rupadevi Garlapati, Sibar Institute of Dental Sciences

Reader, Department of Conservative Dentistry and Endodontics, Sibar Institute of Dental Sciences. 

Sayesh Vemuri, Sibar Institute of Dental Sciences

Professor, Department of Conservative Dentistry and Endodontics, Sibar Institute of Dental Sciences.

Yamini Bandaru, Sibar Institute of Dental Sciences

Senior Lecturer, Department of Conservative and Endodontics, Sibar Institute of Dental Sciences.

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