An In vitro Study on Post Bleaching Pigmentation Susceptibility of Teeth and Scanning Electron Microscopy Analysis.
BACKGROUND
To determine the susceptibility of teeth for repigmentation after bleaching.


METHODS
Forty premolars were assigned to three groups (n = 12). Group 1 was bleached using 30% w/v hydrogen peroxide 15 min 3 times a day every other day for 4 days. In Group 2 was bleached using 16% carbamide peroxide (Polanight), 90 min a day for 15 days. 2 days later, the shades of the bleached teeth were recorded. Remaining 4 teeth were bleached according to Group 1 and 2 and were subjected to atomic force microscopy, scanning electron microscopy analysis.


RESULTS
Specimens of athome bleaching were lighter than the specimens of inoffice bleaching.


CONCLUSIONS
The susceptibility of enamel to pigmentation can be increased after bleaching, and pigmentation is greater if bleaching is performed with H2O2. The percentage change (lighter) was more for athome bleaching specimens as compared to inoffice bleaching specimens.
Senior Lecturer, Department of Conservative Endodontics, The Oxford Dental College & Hospital, Bengaluru, Karnataka, India.
S Pushpa
SP
Latha
Professor and Head, Department of Conservative Dentistry & Endodontics, AME's Dental College and Hospital, Raichur, Karnataka, India.
Vani
V
Hegde
Lecturer, Department of Oral Medicine, Al-Farabi College of Dentistry and Nursing, Riyadh, Saudi Arabia.
Syed Ahmed
SA
Raheel
Professor, Department of Oral & Maxillofacial Sciences, Al-Farabi College of Dentistry and Nursing, Riyadh, Saudi Arabia.
Bassel
B
Tarakji
Assistant Professor, Department of Oral Surgery, Al-Farabi College of Dentistry and Nursing Riyadh, Saudi Arabia.
Saleh Nasser
SN
Azzeghaiby
Associate Professor, Department of Restorative Dentistry, Al-Farabi College of Dentistry and Nursing, Riyadh, Saudi Arabia.
Mohammad Zakaria
MZ
Nassani
Atomic force microscopy; at home bleaching; in office bleaching; repigmentation