Effect of combined application of high- and low-intensity lasers on dentin hypersensitivity: A randomized clinical trial

Abstract

Background. Diode lasers (DLs) have demonstrated equal or better desensitizing effects than fluoride varnish, 10% potas-sium nitrate (NK) gel and Gluma. The current study evaluated the desensitizing effect of combined application of DLs with two different output powers and compared it with single DL therapy. Methods. Sixty-two hypersensitive teeth were allocated randomly into two groups: the single group was treated with 3-W DL beam once and in the combined group, the teeth were irradiated three times (the first time with 0.2-W and then with 3-W and the second and third times, 48 and 96 hours after the baseline visit, with 0.2-W DL beams). The amount of dentin hyper-sensitivity (DH) was evaluated, immediately before and after each visit, and 1 week and 1 and 3 months after the first visit. Data analysis was performed using chi-squared test, repeated measurement of ANOVA and Mann-Whitney U test. P<0.05 was considered statistically significant. Results. Statistically significant changes were observed in the means of VAS indices between all the measurement intervals and pretreatment measures, in both experimental groups (P<0.001). The difference in VAS reduction among the groups was not significant when the hypersensitive teeth were stimulated by a periodontal probe and a jet of air (P=0.63 and P=0.12). Conclusion. The results of the present study showed that using both high-intensity and combined DL beams gives rise to significant reductions in DH. There was no significant difference between combined and single laser therapies in the treatment of tooth hypersensitivity.

Treatment of dentin hypersensitivity with laser: systematic review

“…Laser irradiation before tooth restoration may further improve the DH symptom of non-carious cervical lesions that do not respond to desensitizing agents. Tabibzadeh et al 25 To evaluate the desensitizing effect of the combined application of diode lasers with two different output powers and compare it with single session diode laser therapy.…”

“…Several studies have also employed HPL for the treatment of DH, either singly 11,[17][18][19]21,24,27 or combined with a chemical agent 12,18 or with LPL 12,15 . The beneficial effect of HPL is due to the photothermal mechanism that melts and fuses the hard tissue in its surface layer, obstructing the dentinal tubules and consequently preventing the movement of fluids within these tubules 25 . As mentioned for the LPL, the isolated application of HPL also showed similar results to some chemical desensitizers, such as those based on glutaraldehyde 12 or a prophylaxis paste containing 15% sodium calcium phosphosilicate (SCP) (Nova-Min ® ) or a new varnish (MI Varnish ® ) containing the addition of casein phosphopeptides and amorphous calcium phosphate 19 .…”

Evaluation of the Effects of 660-nm and 810-nm Low-Level Diode Lasers on the Treatment of Dentin Hypersensitivity

“…The VAS is a continuous scale consisting of a horizontal line, generally 10 centimeters in length, anchored by 2 verbal descriptors: "no pain" (score of 0) and "pain as bad as it could be" or "worst possible pain" (score of 10 ). 12 The patients were asked to mark the VAS line at the point that showed their pain intensity.…”

Uso e eficácia clínica do laser no tratamento da hipersensibilidade dentinária: uma revisão de literatura

“…Sabendo que os mecanismos de ação dos lasers de alta e baixa intensidade na redução da hipersensibilidade dentinária são diferentes, Tabibzadeh et al 12 realizaram um estudo que verificou o efeito dessensibilizante da aplicação combinada de lasers com duas saídas diferentes de potências (alta e baixa intensidade) e comparou-a com a terapia única do laser de alta intensidade. Os resultados mostraram que não houve diferença estatisticamente significante entre as duas formas de tratamento utilizadas.…”