Neurosensory analysis of tooth sensitivity during at-home dental bleaching: a randomized clinical trial

Abstract

ObjectiveThe objective of this study was to evaluate dental sensitivity using visual analogue scale, a Computerized Visual Analogue Scale (CoVAS) and a neurosensory analyzer (TSA II) during at-home bleaching with 10% carbamide peroxide, with and without potassium oxalate.Materials and MethodsPower Bleaching 10% containing potassium oxalate was used on one maxillary hemi-arch of the 25 volunteers, and Opalescence 10% was used on the opposite hemi-arch. Bleaching agents were used daily for 3 weeks. Analysis was performed before treatment, 24 hours later, 7, 14, and 21 days after the start of the treatment, and 7 days after its conclusion. The spontaneous tooth sensitivity was evaluated using the visual analogue scale and the sensitivity caused by a continuous 0°C stimulus was analyzed using CoVAS. The cold sensation threshold was also analyzed using the TSA II. The temperatures obtained were statistically analyzed using ANOVA and Tukey's test (α=5%).ResultsThe data obtained with the other methods were also analyzed. 24 hours, 7 and 14 days before the beginning of the treatment, over 20% of the teeth presented spontaneous sensitivity, the normal condition was restored after the end of the treatment. Regarding the cold sensation temperatures, both products sensitized the teeth (p<0.05) and no differences were detected between the products in each period (p>0.05). In addition, when they were compared using CoVAS, Power Bleaching caused the highest levels of sensitivity in all study periods, with the exception of the 14th day of treatment.ConclusionWe concluded that the bleaching treatment sensitized the teeth and the product with potassium oxalate was not able to modulate tooth sensitivity.

Effect of dental bleaching on the microhardness and surface roughness of sealed composite resins

“…The process of dental bleaching has been a subject of discussion in dentistry because it is a conservative technique that is effective for whitening natural teeth [1][2][3], but conflicting results have been documented regarding its effects on restorative materials [4]. The bleaching agents in current use are peroxides in gel form, with concentrations ranging from 4% to 22% and from 25% to 40% for at-home and in-office bleaching techniques, respectively [5,6].…”

Unique Case Reports of Tooth Sensitivity After Consuming Tetrabenazine

“…Broadly acknowledged pathomechanism of TS is Brannstrom and Astrom’s ‘hydrodynamic theory’ where external stimulus causes rapid fluid movements in dentinal tubules activating sensory nerves in inner dentin and pulp releasing inflammatory mediators that can depolarize the chemosensitive ion channels TRPA1 causing discomfort, pain, and TS [ 1 , 7 , 8 ]. The other mechanisms are the direct innervation theory and the odontoblast receptor theory, which are less recognized because of the lack of evidence to support them [ 9 ].…”

Dental Whitening Gels: Strengths and Weaknesses of an Increasingly Used Method

“…The teeth became more sensitive to cold, increasing sensitivity and skin cold sensation according to Rahal et al [13]. Briso et al [14] tried to evaluate this side effect through a scale (VAS [9]) and a computerized visual analogue scale (CoVAS), in addition to a neurosensory analyzer (TSA II), in home bleaching. In this case, the results obtained said that over 20% of the teeth presented sensitivity during treatment; the bleaching sensitized the teeth.…”