Evaluation of Microleakage of Dental Composites Using Bonding Agents with Different Placement Techniques: An Invitro Study.
BACKGROUND
The rapid progress of adhesive dentistry over the past decade has been attributed to the significant advances in dentin bonding technology. Requirements of an ideal bonding agent are quite similar to those indicated by Buonocore despite of many improvements. As we enter the new millennium, it is important for us to examine the past.


OBJECTIVE
To evaluate the microleakage of three bonding agents namely Single Bond, Prime & Bond NT and Excite using different composite materials namely Z100, Spectrum TPH, Tetric with three different placement techniques.


METHODS
Fifty four extracted human premolars were taken & divided into 9 groups depending upon application of bonding agents followed by composite restorations. Specimens were subjected to thermal cycling at 6(0)C, 37(0)C, 54(0)C and again at 37(0)C & then placed in 10 ml each of freshly prepared 50% silver nitrate solution for 2 hour in darkness, washed & placed under sun light for 24 hours. The sectioned specimens were then observed under stereomicroscope to detect microleakage.


RESULTS
On comparing the mean microleakage scores among the three groups, maximum microleakage scores have been obtained when no bonding agent was used, while least microleakage scores were obtained with double coat of bonding agent.


CONCLUSIONS
The present study suggests that the placement of bonding agent technique before composite restoration can be effective to limit the microleakage at the tooth restoration interface.
Senior Lecturer, Department of Pedodontics, Bjs Dental College , Ludhiana, India .
Jasvir
J
Kaur
Lecturer, Department of Pedodontics, College of Medical Sciences , Bharatpur, Nepal .
Deepika
D
Kapoor
Lecturer, Department of Oral Medicine and Radiology, College of Medical Sciences , Bharatpur, Nepal .
Deepanshu
D
Garg
Professor and Hod, Department of Oral Medicine and Radiology, Gnddc , Sunam .
M K
MK
Sunil
Assistant Professor, Department of Periodontics, Ucms , Bhairahawa Nepal .
Anshul
A
Sawhney
Assistant Professor, Department of Prosthodontics, Ucms , Bhairahawa, Nepal .
Neha
N
Malaviya
Assistant Professor, Department of Oral Surgery, Ucms , Bhairahawa Nepal .
Shashank
S
Tripathi
PG Student, Department of Oral Medicine and Radiology, Gnddc , Sunam, India .
Saloni
S
Arora
Adhesion; Adhesive dental agents; Pediatric dentistry; Resin restoratives