Examinando por Materia "Impresiones dentales"

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Acceso abierto
Comparison of dimensional changes of two hydrocolloids irreversible agents commonly used in dental practice according to time elapsed after printing. In vitro study. Lima Peru 2022
(Universidad Privada Norbert Wiener, 2023-06-28) Jiménez Cervantes, Marita; Llerena Meza De Pastor, Verónica
The objective was to compare the dimensional changes of two irreversible hydrocolloids commonly used in dental practice, according to the time elapsed after the impression. Methodology: Two irreversible hydrocolloids, Alginelle and Hygedent, were used to take 27 impressions on an acrylic master model. A reference point was chosen, measuring the transverse distance (intermolar distance), which was also measured in the dental impressions at different time intervals: immediately after the impression, and at 60 and 120 minutes. All data were recorded in the data collection form. Results: The dimensional change of the Alginelle hydrocolloid was 0.35 mm immediately after the impression, 0.42 mm at 60 minutes, and 0.47 mm at 120 minutes. The dimensional change of the Hygedent hydrocolloid was 0.48 mm immediately after the impression, 0.66 mm at 60 minutes, and 0.67 mm at 120 minutes. Conclusion: No discrepancies were found in the dimensional changes of the two commonly used irreversible hydrocolloids in dental practice according to the time elapsed after the impression.
Acceso abierto
Comparison of the efficacy of four disinfection techniques, in dental impressions with condensation silicone 2023
(Universidad Privada Norbert Wiener, 2023-12-01) Velazco Malpartida, Faride Melissa; Rojas Ortega, Raúl Antonio
The objective of this study was to compare the effectiveness of four disinfection techniques in dental impressions with condensation silicone in 2023. Materials and Methods: A total of 50 dental impressions obtained from patients were divided into 5 groups for treatment. Control group: ten impressions using condensation silicone, without disinfection, only immersed in distilled water for 10 minutes. Group 1: ten individual impressions passed through distilled water, then swabbed and immersed in 2% glutaraldehyde for 10 minutes, followed by swabbing and inoculating on agar-agar. Group 2: ten dental impressions passed through distilled water, then immersed in 0.5% sodium hypochlorite, followed by swabbing and inoculating on agar-agar. Group 3: ten dental impressions passed through distilled water, then immersed in 2% chlorhexidine, followed by swabbing and inoculating on agar-agar. Group 4: ten dental impressions passed through distilled water, then exposed to ultraviolet light for 10 minutes, followed by swabbing and inoculating on agar-agar. Results: It was observed that distilled water does not completely eliminate microorganisms, only reducing them, and no significant difference was found (p>0.05). Glutaraldehyde 2% had a p-value = 0.004, showing a significant difference (p<0.05) compared to the control group. Chlorhexidine 2% had a p-value = 0.002, showing a significant difference (p<0.05) compared to the control group. Sodium hypochlorite 0.5% had a p-value = 0.004, showing a significant difference (p<0.05) compared to the control group, while ultraviolet light had a p-value = 0.114, showing no significant difference (p>0.05) compared to the control group. Conclusion: It was concluded that the most effective agent for disinfection of dental impressions with condensation silicone is 2% chlorhexidine immersed for 10 minutes.
Acceso abierto
Relationship of workload and self-perception of oral health in nursing graduates on the front line of Covid-19 care in Metropolitan Lima, 2021
(Universidad Privada Norbert Wiener, 2022-11-15) Palomino Requena, Roberto Ruben; Vásquez Rodrigo, Hernán
The objective of this research is to compare in vitro the dimensional stability of impressions made with condensation silicone on plaster models using three spaced pouring times, based on a master model made of stainless steel. This is an experimental study, where 30 impressions were made on a stainless steel master model using Speedex Putty condensation silicone, divided into 3 groups according to pouring times: 10 impressions at 30 minutes, 10 impressions at 60 minutes, and 10 impressions at 24 hours. To establish dimensional stability, a Duramax 5/5/5 coordinate machine with ZEISS (Germany) contact scanning technology was used, where six locations (A, B, C, D, E, and Angle measurement) were measured. Statistical analysis using ANOVA showed significant differences between the pouring times of 30 minutes and 24 hours in measurements A, B, and the Angle measurement. In conclusion, it was demonstrated that there is less dimensional alteration in definitive models poured in plaster at 30 minutes, as evidenced by Measurements C, D, E, and the Angle measurement. In relation to the pouring time of 60 minutes, greater dimensional stability was only found in Measurements A and B. On the other hand, the 24-hour pouring time showed the greatest dimensional variation compared to the 30 and 60-minute pouring times.