Objective:
This study was carried out to examine the effect of two in-office bleaching systems by measuring the level of catalase enzyme (CAT) and nitric oxide (NO) in the gingival fluid (GCF) before and after bleaching. In addition, participants were asked to fill out an online survey to examine their satisfaction with the bleaching procedure.
Materials and Methods:
Thirty-six healthy young participants of 18- 25 years old were selected. They were divided into two groups according to the bleaching system used; Z1:Philips Zoom White of 25% H2O2 and Z2: Fläsh White Smile of 32% H2O2. Three sessions, 15 minutes each, were performed during the same visit for each participant. GCF samples were collected using a sterile periopaper before and after the bleaching session. A survey link was sent to all participants to examine their satisfaction.
Results:
There was a statistically significant increase in CAT and NO in the GCF of the Z2 when compared to the Z1. The bleaching survey revealed no statistically significant satisfactory experience 93.8% and 94.1% respectively regarding Z1 and Z2. There was no statistically significant difference between the Z2 and Z1 in all participants' answers except in the degree of gingival pain. The number of participants who reported no or mild pain in the Z2 was greater than those in the Zoom.
Conclusion:
The higher percentage of H2O2 in Z2 increased CAT and NO release in the GCF. Participants in both groups were equally satisfied. Dental materials risks must be evaluated to prevent endangering human health.