scholarly journals Impact of 35% Hydrogen Peroxide on Color and Translucency Changes in Enamel and Dentin

2018 ◽  
Vol 29 (1) ◽  
pp. 88-92 ◽  
Author(s):  
Rebeca Pereira de Menezes ◽  
Paula Damasceno Silva ◽  
Pollyana Caldeira Leal ◽  
André Luis Faria-e-Silva
Keyword(s):  
Hydrogen Peroxide ◽  
Tooth Bleaching ◽  
Repeated Measure ◽  
Color Parameter ◽  
Hard Tissue ◽  
High Concentration ◽  
Repeated Measure Anova ◽  
Diamond Bur ◽  
Measure Anova ◽  
Assessment Time

Abstract This study evaluated the effects of tooth bleaching with high-concentration of hydrogen peroxide on alterations of translucency parameter (TP) and color of dentin and enamel. The crown of five human molars was sectioned into four slices parallel to buccal surface. The dentin of external slices containing buccal/ lingual enamel was fully removed with diamond bur; while these slices were used to assess alterations on enamel. Alterations on dentin were assessed into the center of internal slices. The color of specimens was measured over white and black backgrounds using a spectrophotometer (CieL*a*b) at baseline, allowing to calculate the TP by difference between the color measured over each background. Specimens were submitted to three 15-min applications of 35% hydrogen peroxide followed by their storage in water for one-week. Afterwards, the color measurements were repeated at both backgrounds. Color (∆L, ∆a, ∆b and ∆E) and translucency (∆TP) changes were calculated and data individually analyzed by T-test (α = 0.05). Influence of hard tissue and assessment time on each color parameter was also analyzed by 2-way repeated measure ANOVA (α = 0.05). Tooth bleaching resulted in increased lightness for the enamel, whereas no alteration on this parameter occurred for dentin. No difference between the tooth hard tissues was observed regards the other color parameters and ∆E. A slightly reduction on TP was observed only for the enamel. In conclusion, 35% hydrogen peroxide caused similar color and translucency changes on dentin and enamel.

Comparative Analysis of Barefoot and Shod Running

2011 ◽  
Vol 20 (3-4) ◽  
pp. 113-130 ◽  
Author(s):  
Colin Utz-Meagher ◽  
John Nulty ◽  
Lisa Holt
Keyword(s):  
Comparative Analysis ◽  
Force Plate ◽  
Video Camera ◽  
Repeated Measure ◽  
Initial Contact ◽  
Baseline Trial ◽  
Repeated Measure Anova ◽  
Measure Anova ◽  
Before And After ◽  
Post Test

Comparative Analysis of Barefoot and Shod Running This study investigated the biomechanical difference between running barefoot and shod before and after a barefoot training program (BTP). Foot angles at contact (FA), contact time (CT), stride length (SL), initial contact force (ICF), and total peak force (TPF) in shod and unshod runners was analyzed. Fourteen collegiate runners attended 12 total sessions over a two week period. Subjects performed a baseline trial, running eight (10-20 meter) repetitions, four barefoot and four shod, at three different stations; running over a force plate, running in front of a SONY DCR-HC52 video camera (30fps) and running in front of a Casio Exilim Pro EX-F1 camera (300fps). A Post-Test (PT) was conducted at the end of the BTP. A repeated measure ANOVA showed significance (p<.05) in the Test factor, BTP; lowering participants FA mean from 18.8deg+/-.9deg to 5.6deg+/-15.1deg, CT mean from .221m+/-.02m to .2m+/-.03m, and TPF mean from 1427.4N+/-312.9N to 1348.2N+/-269.4N. A repeated measure ANOVA showed significance (p<.05) in the Condition factor (shod vs. unshod); lowering participants FA mean from 23.1deg+/-12.6deg to 1.3deg+/-14.4deg, SL mean from .9m+/-.1m to .8m+/-.1m, and ICF mean from 1465.3N+/- 369.6N to 1324.7N+/-379.4N. Running barefoot and following a BTP alters running biomechanics in ways that may decrease running related injuries.

scholarly journals The change of teeth color, whiteness variations and its psychosocial and self-perception effects when using low vs. high concentration bleaching gels: a one-year follow-up.

2020 ◽  
Author(s):  
Juan Estay ◽  
Pablo Angel ◽  
Cristian Bersezio ◽  
Mateus Tonetto R ◽  
Gilbert Jorquera ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Health Impact ◽  
Psychosocial Impact ◽  
Tooth Bleaching ◽  
Self Perception ◽  
High Concentration ◽  
Low Concentration ◽  
Positive Effects ◽  
One Year

Abstract Background: Dental bleaching in traditional concentrations generates greater sensitivity. In this respect, new systems of lower concentration of hydrogen peroxide for tooth bleaching appeared, with color stability unknown over time. The aim of this study was to compare the change and stability of color with low-concentration (6%) hydrogen peroxide gel in an in-office bleaching setting relative to conventional 37.5% gel, including their effects on psychosocial and esthetic self-perception, after one year.Methods: Patients (n=25) were assessed at 12 months post bleaching treatment (whitening with 6% chemo-activated alkaline formula gel versus 37.5% traditional concentration gel). Color changes were measured objectively using total variation in color (ΔE), and subjectively using Vita Classical and Vita Bleached scale (ΔSGU) by calibrated evaluators (Kappa=0.85). The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and Oral Health Impact Profile (OHIP-14) aesthetic questionnaires were used to measure the self-perception and the psychosocial impact of the bleaching protocols.Results: The effect (ΔE) of 37.5% HP (8.37 ± 2.73) was significantly better than that of 6% HP (5.27 ± 2.53) in terms of color rebound after one year of follow-up. There were significant differences in psychosocial impact and esthetic self-perception measurements prior to bleaching versus one-year post-whitening time points; positive effects were maintained.Conclusions: Low concentration (6%) achieved effective bleaching with good stability after one year, accompanied by a positive psychosocial impact and enhanced self-perception at follow-up.Trial registration: NCT03217994 (before enrollment of the first participant). Data register: July 14, 2017

scholarly journals The change of color by whiteness indexes and its psychosocial and self-perception effects when using low vs. high concentration whitening gels: a one-year follow-up.

2020 ◽  
Author(s):  
Juan Estay ◽  
Pablo Angel ◽  
Cristian Bersezio ◽  
Manuel Peña ◽  
Eduardo Fernandéz
Keyword(s):  
Hydrogen Peroxide ◽  
Health Impact ◽  
Psychosocial Impact ◽  
Tooth Bleaching ◽  
Self Perception ◽  
High Concentration ◽  
Low Concentration ◽  
Positive Effects ◽  
One Year

Abstract Background: Dental bleaching in traditional concentrations generates greater sensitivity. In this respect, new systems of lower concentration of hydrogen peroxide for tooth bleaching appeared, with color stability unknown over time. The aim of this study was to compare the change and stability of color with low-concentration (6%) hydrogen peroxide gel in an in-office bleaching setting relative to conventional 37.5% gel, including their effects on psychosocial and esthetic self-perception, after one year. Methods: Patients (n=25) were assessed at 12 months post bleaching treatment (whitening with 6% chemo-activated alkaline formula gel versus 37.5% traditional concentration gel). Color changes were measured objectively using total variation in color (ΔE), and subjectively using Vita Classical and Vita Bleached scale (ΔSGU) by calibrated evaluators (Kappa=0.85). The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and Oral Health Impact Profile (OHIP-14) aesthetic questionnaires were used to measure the self-perception and the psychosocial impact of the bleaching protocols. Results: The effect (ΔE) of 37.5% HP (8.37 ± 2.73) was significantly better than that of 6% HP (5.27 ± 2.53) in terms of color rebound after one year of follow-up. There were significant differences in psychosocial impact and esthetic self-perception measurements prior to bleaching versus one-year post-whitening time points; positive effects were maintained. Conclusions: Low concentration (6%) achieved effective bleaching with good stability after one year, accompanied by a positive psychosocial impact and enhanced self-perception at follow-up. Trial registration: NCT03217994 Keywords: Bleaching, Randomized clinical trial, Low concentration, OHIP-14 , PIDAQ

scholarly journals Can ozone or violet light improve the color change or physicochemical properties of hydrogen peroxide-bleached tooth?

2021 ◽  
Vol 32 (4) ◽  
pp. 19-30
Author(s):  
Nayara Rodrigues Nascimento Oliveira Tavares ◽  
Alexia da Mata Galvão ◽  
Lia Dietrich ◽  
Roberta Furtado Carvalho ◽  
Robinson Sabino Silva ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Roughness ◽  
Color Change ◽  
Repeated Measure ◽  
Color Changes ◽  
Violet Light ◽  
Atomic Force ◽  
Measure Anova ◽  
Before And After ◽  
To Receive

Abstract: This study investigated the bleaching effectiveness and the physicochemical effects on enamel of violet light and ozone, associate or not to hydrogen peroxide, compared to 35%-hydrogen peroxide. Enamel-dentin blocks from human molars were randomly allocated to receive one of the following bleaching protocols (n=15): (HP) 35%-hydrogen peroxide, (VL) violet light, (OZ) ozone, the association between hydrogen peroxide with ozone (OZ+HP) or violet light (VL+HP). All protocols were performed in two sessions with a 48h interval. Color (spectrophotometer) and mineral composition (Raman spectroscopy) were measured before and after the bleaching. Color changes were calculated by ΔEab, ΔE00, and whitening index (WI). The surface roughness was measured with an atomic force microscope. Data were analyzed by One-way or Two-way repeated measure ANOVA followed by the Tukey’s test (α = 0.05). The lowest color change values (either measured by WI, ΔEab, or ΔE00) were observed for VL and OZ used with no HP. Violet light associate with HP was unable to improve the color changes observed for the peroxide alone, in combination with OZ and HP, the highest color changes were verified. Regardless of bleaching protocol, the bleached enamel presented higher contents of PO4 and CO3 -2 than those observed at baseline. All bleaching protocols resulted in similar enamel surface roughness. Both the VL and the OZ caused reduced effects on the enamel color change when used alone. The ozone therapy improved the bleaching effect in the group that received the association of HP.

scholarly journals The change of teeth color, whiteness variations and its psychosocial and self-perception effects when using low vs. high concentration bleaching gels: a one-year follow-up

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
J. Estay ◽  
P. Angel ◽  
C. Bersezio ◽  
M. Tonetto ◽  
G. Jorquera ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Health Impact ◽  
Psychosocial Impact ◽  
Tooth Bleaching ◽  
Self Perception ◽  
High Concentration ◽  
Low Concentration ◽  
Positive Effects ◽  
One Year

Abstract Background Dental bleaching in traditional concentrations generates greater sensitivity. In this respect, new systems of lower concentration of hydrogen peroxide for tooth bleaching appeared, with color stability unknown over time. The aim of this study was to compare the change and stability of color with low-concentration (6%) hydrogen peroxide gel in an in-office bleaching setting relative to conventional 37.5% gel, including their effects on psychosocial and esthetic self-perception, after 1 year. Methods Patients (n = 25) were assessed at 12 months post bleaching treatment (whitening with 6% chemo-activated alkaline formula gel versus 37.5% traditional concentration gel). Color changes were measured objectively using total variation in color (ΔE), and subjectively using Vita Classical and Vita Bleached scale (ΔSGU) by calibrated evaluators (Kappa = 0.85). The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and Oral Health Impact Profile (OHIP-14) aesthetic questionnaires were used to measure the self-perception and the psychosocial impact of the bleaching protocols. Results The effect (ΔE) of 37.5% HP (8.37 ± 2.73) was significantly better than that of 6% HP (5.27 ± 2.53) in terms of color rebound after 1 year of follow-up. There were significant differences in psychosocial impact and esthetic self-perception measurements prior to bleaching versus one-year post-whitening time points; positive effects were maintained. Conclusions Low concentration (6%) achieved effective bleaching with good stability after 1 year, accompanied by a positive psychosocial impact and enhanced self-perception at follow-up. Trial registration NCT03217994 (before enrollment of the first participant). Data register: July 14, 2017.

scholarly journals The change of teeth color, whiteness variations and its psychosocial and self-perception effects when using low vs. high concentration bleaching gels: a one-year follow-up.

2020 ◽  
Author(s):  
Juan Estay ◽  
Pablo Angel ◽  
Cristian Bersezio ◽  
Mateus Tonetto R ◽  
Gilbert Jorquera ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Health Impact ◽  
Psychosocial Impact ◽  
Tooth Bleaching ◽  
Self Perception ◽  
High Concentration ◽  
Low Concentration ◽  
Positive Effects ◽  
One Year

Abstract Background: Dental bleaching in traditional concentrations generates greater sensitivity. In this respect, new systems of lower concentration of hydrogen peroxide for tooth bleaching appeared, with color stability unknown over time. The aim of this study was to compare the change and stability of color with low-concentration (6%) hydrogen peroxide gel in an in-office bleaching setting relative to conventional 37.5% gel, including their effects on psychosocial and esthetic self-perception, after one year. Methods: Patients (n=25) were assessed at 12 months post bleaching treatment (whitening with 6% chemo-activated alkaline formula gel versus 37.5% traditional concentration gel). Color changes were measured objectively using total variation in color (ΔE), and subjectively using Vita Classical and Vita Bleached scale (ΔSGU) by calibrated evaluators (Kappa=0.85). The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and Oral Health Impact Profile (OHIP-14) aesthetic questionnaires were used to measure the self-perception and the psychosocial impact of the bleaching protocols. Results: The effect (ΔE) of 37.5% HP (8.37 ± 2.73) was significantly better than that of 6% HP (5.27 ± 2.53) in terms of color rebound after one year of follow-up. There were significant differences in psychosocial impact and esthetic self-perception measurements prior to bleaching versus one-year post-whitening time points; positive effects were maintained. Conclusions: Low concentration (6%) achieved effective bleaching with good stability after one year, accompanied by a positive psychosocial impact and enhanced self-perception at follow-up. Trial registration: NCT03217994 (before enrollment of the first participant). Data register: July 14, 2017

scholarly journals Comparison of the effectiveness of Aloe Vera gel with 2% Nitrofurazone ointment on the healing of superficial partial-thickness burns: A randomized clinical trial study

2021 ◽  
Author(s):  
Parichehr Sabaghzadeh Irani ◽  
Hadi Ranjbar ◽  
Shokoh Varaei ◽  
Sanaz Bostani ◽  
Omalbanin Akbari ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Aloe Vera ◽  
The Body ◽  
Repeated Measure ◽  
Intervention Period ◽  
Repeated Measure Anova ◽  
Measure Anova ◽  
Partial Thickness ◽  
Aloe Vera Gel ◽  
Partial Thickness Burns

Background & Aim: Routine treatment of burn injuries is dressing with Nitrofurazone ointment. It has several complications, including sensitivity. Aloe Vera is a traditional treatment for wound healing.  This study aimed to compare the effectiveness of Aloe Vera gel with Nitrofurazone ointment in the healing of superficial partial-thickness burns. Methods & Materials: The present study was a split body controlled clinical trial which was carried out on 30 patients with superficial partial-thickness burns. The study was conducted in the Shafa Hospital in Kerman, Iran, in 2016. The sample was recruited from patients who had at least two burns, each burn on an alternate side of the body. On their burns, samples were allocated to two groups that received Aloe Vera gel or 2% Nitrofurazone ointment. Bates-Jensen Wound assessment tool was used to evaluate the healing of burns. Statistical analysis was conducted by SPSS-16 and using the repeated measure ANOVA. Results: The repeated measure ANOVA showed that there was a significant change in the score of BWAT in all areas during the intervention period (p=0.001), but the trend of healing in the two groups during the intervention period was not significantly different (p=0.098). Conclusion: Based on this study, it looks like Aloe vera gel is as effective as 2% Nitrofurazone ointment in healing wounds.

Abstract 142: Evaluation of Clinical Efficacy and Safety of a Newly Developed Automated Cardiopulmonary Resuscitation Device; A Porcine Cardiac Arrest Model

Circulation ◽  
2018 ◽  
Vol 138 (Suppl_2) ◽  
Author(s):  
Ki Hong Kim ◽  
Sang Do Shin ◽  
Tae Han Kim ◽  
Ki Jeong Hong ◽  
Seong Wook Choi ◽  
...  
Keyword(s):  
Life Support ◽  
Repeated Measure ◽  
P Value ◽  
Hemodynamic Parameters ◽  
Open Thoracotomy ◽  
Repeated Measure Anova ◽  
Measure Anova ◽  
Significant Difference ◽  
Pathologic Findings ◽  
Cpr Quality

Background: Various automated compression device (ACD) have been adopted by emergency medical services (EMS) worldwide to ensure cardiopulmonary resuscitation (CPR) quality. We developed a new ACD with a manual adjustment function according to compression depth and rate. This study aimed to compare the CPR quality and chest injury caused between the new ACD and a conventional device (LUCAS, Physio-Control, Sweden). Methods: A randomized experimental trial using each eight pigs for ACD and Lucas group were performed to compare the CPR quality, outcomes, and safety. After 1-minute of untreated electrical-induced ventricular fibrillation, followed by 8-minutes of basic life support, and 20-minutes of advanced cardiac life support including epinephrine infusion were provided under mechanical ventilation. Hemodynamic parameters were obtained and observed end-tidal CO2 (ETCO2) were continuously measured from endotracheal tube as study outcome. Mixed model analysis and repeated measure ANOVA were used to compare the difference of hemodynamic parameters and observed ETCO2. We examined the all pigs for gross pathologic findings (number of lung contusion, laceration, bone fracture, and hematoma in the thoracic cavity) after CPR procedures through open thoracotomy. Results: There was no significant difference for hemodynamic parameters such as mean arterial pressure, 29.4 mmHg in ACD group versus 35.3 mmHg in Lucas group (p-value= 0.39). Observed ETCO2 between ACD and Lucas group were 18.0 and 26.8 mmHg (p-value=0.24). Repeated measure ANOVA for observed ETCO2 did not show significant difference (17.6 versus 26.0, p-value= 0.29). The gross pathologic findings through open thoracotomy examination after CPR showed insignificant difference of injury number in chest cavity and wall (7.63 versus 9.38, p-value= 0.49). Conclusions: Hemodynamic parameters and observed ETCO2 were slightly better in Lucas group than new ACD group. However, the statistical significances were not found in the porcine experimental mechanical models.

scholarly journals Effect of Crossfit Training on Jump and Strength

2018 ◽  
Vol 7 (1) ◽  
pp. 121 ◽  
Author(s):  
Oğuzhan Yüksel ◽  
Bolat Gündüz ◽  
Mert Kayhan
Keyword(s):  
Repeated Measure ◽  
Control Group ◽  
Control Groups ◽  
Squat Jump ◽  
Repeated Measure Anova ◽  
Measure Anova ◽  
Wilks Lambda ◽  
The Mean ◽  
Crossfit Training ◽  
Experimental Group

The purpose of this study is to investigate the effect of regular CrossFit training on some force and jump parameters. 32 healthy wrestling men participated in the study, 16 experimental and 16 control groups. For the experimental group, CrossFit training, known as Cindy, was practiced three times a week for 8 weeks. The training consisted of 5 bars, 10 push-ups and 15 squats for 20 minutes. The control group continued the classical wrestling practice. Myotest accelerometric system was used for measurements of participants’ values. For the analysis of the data, repeated measure ANOVA was used. According to the results, as a result of CrossFit training, athletes' squat jump heights increased (Wilks' Lambda = .541, F (1,30) = 25, p = .00). The mean post-training leap values (33.778 ± 5.48) were higher than the pre-training leap values (32.169 ± 4.95) (p <0.05). It can be concluded that Cindy CrossFit studies improve jumping and strength ability.

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