Examinando por Materia "Ácido clorhídrico"

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    Change of dental coloration in pigmented bovine specimens using mechanical microabrasion with 18% hydrochloric acid and 37% phosphoric acid techniques: comparative in vitro study, Lima 2018
    (Universidad Privada Norbert Wiener, 2018-12-06) Herrera Pastor, Carla Vanesa; Reynafarje Reyna, Julio César
    Enamel microabrasion is an effective and conservative treatment for the removal of stains or atypical pigments from the enamel surface. After a thorough review, it is known that there are two acids, one more commonly used than the other. But how effective are they when compared? Objective: To determine which technique produces a greater change in dental coloration in pigmented bovine teeth, using mechanical microabrasion with hydrochloric acid at 18% (HCL18%) and phosphoric acid at 37% (H3PO4 37%). Materials and Methods: Experimental, in vitro study. A total of 74 bovine permanent teeth were used, followed by pigmentation with ground and instant coffee for a period of 48 hours. The samples were randomly divided into two groups (n=34), based on the acid used: Group 1: HCL18% + pumice stone, applied with a prophylactic brush; Group 2: H3PO4 37% + pumice stone, using a rubber cup for prophylaxis. All samples received 5 applications of 10 seconds each, followed by 10 seconds of rinsing. The color change was measured using a visual color guide, VITA Toothguide 3D-MASTER, before the treatment, after the 1st, 3rd, and 5th applications. Results: Statistically, mechanical microabrasion with HCL18% generated a greater change in color in pigmented bovine teeth compared to H3PO4 37%, with p = 0.01 < 0.05. There was also a color change in the teeth treated with H3PO4 37% after the 1st, 3rd, and 5th applications (p = 0.000). Conclusion: Both techniques showed effectiveness in terms of dental color change.