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Oral Health and Preventive Dentistry
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Oral Health Prev Dent 18 (2020), No. 3     8. June 2020
Oral Health Prev Dent 18 (2020), No. 3  (08.06.2020)

Open Access ORAL MEDICINE, Online Article, Page 543-548, doi:10.3290/j.ohpd.a44690, PubMed:32515426


Online Article: The Effect of CO2 Laser Irradiation Combined with TiF4 and NaF Varnishes on Enamel Hardness: An In Vitro Study
Dehghan, Hajar / Mojarad, Farzad / Serajzadeh, Maryam / Fekrazad, Reza
Purpose: To assess the effects of experimental titanium tetrafluoride (TiF4) varnish and commercial sodium fluoride (NaF) varnish with CO2 laser on enamel hardness.
Materials and Methods: Ninety human enamel samples were randomly assigned to one of the following groups: 1. control (no treatment) (CO); 2. NaF varnish (2.26%) (NF); 3. TiF4 varnish (2.45%) (TF); 4. CO2 laser (La); 5. NaF varnish (2.26%) with CO2 laser (NFL); 6. TiF4 varnish (2.45%) with CO2 laser (TFL). Enamel surface changes were determined by Vickers microhardness (VH) test with a load of 1000 g and a dwell time of 12 s. Each sample was indented three times. Data were analysed using one-way ANOVA and Tukey's test.
Results: The mean surface microhardness was 245.5 VH in the CO group, 280.3 VH in group NF, 338.7 VH group TF, 277.0 VH in group La, 345.3 VH in group NFL, and 368.0 VH in group TFL. Statistical analysis showed that groups TF, NFL, and TFL had statistically significantly higher surface hardness than the control group (p < 0.05).
Conclusion: The microhardness of enamel treated with TiF4 varnish with or without laser irradiation was statistically significantly greater than that of the control group. Thus, using TiF4 to increase enamel surface microhardness can be recommended.

Keywords: CO2 laser, enamel hardness, TiF4 varnish