Examinando por Autor "Reynafarje Reyna, Julio César"

Mostrando 1 - 3 de 3

Acceso abierto
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.
Acceso abierto
Colour stability in composite resin and giomer subjected to pigmented beverages: comparative in vitro study, Lima 2018
(Universidad Privada Norbert Wiener, 2019-01-23) Velasco Delgado, Anghely; Reynafarje Reyna, Julio César
The purpose of this research was to determine the color stability in a composite resin and a giomer, both subjected to three pigmented beverages: coffee, wine, and purple corn for 24 hours. The study was experimental, involving a sample of 30 specimens of composite resin and giomer, divided into 6 groups with 5 specimens per pigmented beverage. Each specimen had a diameter of 10mm and a height of 2mm. The specimens were submerged in 3 pigmented beverages: coffee, wine, and purple corn for a period of 24 hours. The instrument used was the Chromascop colorimeter, as it is the most widely used in daily professional practice. The database was entered into an Excel 2016 spreadsheet and later processed in the SPSS 25 statistical program. A 5% confidence level and a 95% confidence interval were applied. The results showed that in both the composite resin and giomer groups, color stability was higher with coffee and purple corn, both showing a 33.3% stability rate. An association between color stability and the pigmented beverages was observed in each group. The study concluded that there were no differences in color stability between composite resin and giomer when subjected to the three pigmented beverages.
Acceso abierto
Relationship between the facial pattern and the type of teeth according to morphopsychology, in patients attended in the Dentistry Clinic of the Private University Norbert Wiener, Lima, 2018
(Universidad Privada Norbert Wiener, 2019-07-24) Porras Huanca, Fabiola Vanessa; Reynafarje Reyna, Julio César
This study was conducted with the aim of determining the relationship between facial pattern and tooth type according to morphopsychology in patients treated at the Private University Norbert Wiener Dental Clinic, Lima, 2018. The population consisted of 600 patients over 18 years of age who were treated at the Private University Norbert Wiener Dental Clinic during the 2018-1 academic period. Clinical measurements of facial height and width were taken using a digital Vernier caliper, and intraoral photographs were captured and later evaluated. The research was observational, prospective, cross-sectional, and descriptive. The Murray and Larry formula was used to calculate the representative sample, which consisted of 113 patients who met specific inclusion criteria. The following variables were collected: sex, facial pattern, morphopsychology of tooth type, and age. Data entry and statistical analysis were performed using the IBM SPSS 25.0® statistical program for Windows 10. The results showed that there was no statistically significant difference between the facial pattern and the tooth type according to morphopsychology. The most prevalent pattern was dolichofacial at 23.9%, corresponding to the oval tooth type, followed by triangular, rectangular, and square types at 14.2%, 2.7%, and 5.3%, respectively. In conclusion, the results indicated that tooth type according to morphopsychology should not be related to facial pattern, as no statistically significant association was found.