The effect of 5 minute whitening system (hydrogen peroxide based)‎ on human dental pulp : histologigal and ultrastructural in vivo study

الملخص EN

Aim: This study was designed to evaluate the histological and the ultrastructural changes in human dental pulp after in vivo bleaching with hydrogen peroxide (5 minutes speed whitening gel ).

Design:Twelve patients between 18 and 24 years of age with caries-free upper and lower first premolars scheduled for orthodontic extraction were selected.

First premolars of one side of all patients were whitened for two weeks using (5 minutes speed whitening gel ,plus white Products).

The first premolars of the other side were left without whitening and served as control.

After treatmant, Patients were divided into two groups 6 patients each.

Group (1): The whitened First premolars of this group were extracted by the end of the second week of treatment.

Group (2) The whitened first premolars were left for another two weeks without treatmant then they were extracted.

Immediately after extraction, 1/3 of the apical portion of each root was sectioned off.

Then the extracted teeth were prepared for histological and ultrastructural evaluation .

Results : Slight pulpal changes were histologically detected in group(I) which was confirmed by the ultrastrucural level.The affected cells were the odontoblasts and the fibroblasts which appeared quiscent with regression of their cytoplasmic organells .The blood vesels were dilated with engorged RBCes, denoting mild reversable pulpitis.

Pulp of the second group appeared histologically and ultrastructurally close to that of the control group.

Conclusion:The findings from this study demonstrated that at home bleaching procedures using 10% hydrogen peroxide might cause initial mild, localized pulp reactions.

However, the changes observed did not affect the overall health of the pulp tissue and were reversible within two weeks posttreatment.

Therefore, two weeks of treatment with 10% hydrogen peroxide used for at home bleaching could be considered safe for dental pulp.