scholarly journals Analysis of the Pulp Chamber Temperature of Teeth Submitted to Light Activation with and without Bleaching Gel

2011 ◽  
Vol 2 (1) ◽  
pp. 23-27 ◽  
Author(s):  
Daphne Câmara Barcellos ◽  
Alessandra Buhler Borges ◽  
Carlos Rocha Gomes Torres ◽  
Graziela Ribeiro Batista
Keyword(s):  
Irradiation Time ◽  
Light Sources ◽  
Halogen Lamp ◽  
Light Activation ◽  
Pulp Chamber ◽  
Mean Values ◽  
Halogen Light ◽  
Different Types ◽  
Chamber Temperature ◽  
The Mean

ABSTRACT Purpose This study evaluated the temperature of the pulpal chamber (PC) of teeth submitted to the light activation with and without bleaching gel, using different types of light sources. Materials and methods A digital thermometer, thermocouple K type, was located in the PC of human upper central incisors and the specimens received light activation from the following sources: G1—Laser, G2—Halogen light, G3—progressive intensity halogen lamp, G4—LED/Laser. The light was applied for 3 minutes, with and without the use of bleaching gel. The data were collected after every 30 seconds and analyzed by three-way ANOVA and Tukey's test. Results The mean values were: Use of the gel—with gel: 3.09a, without gel: 2.79b; Type of light source—G1: 0.60a, G2: 2.38b, G3: 4.16c, G4: 4.63d; Time of activation 30 seconds: 1.15a, 1 minutes: 2.20b, 1 minutes 30 seconds: 2.97c, 2 minutes: 3.44d, 2 minutes 30 seconds: 3.81e, 3 minutes: 4.09e. Conclusions The use of bleaching gel associated with light activation resulted in higher heating of the PC. LED/LASER light and progressive intensity halogen lamp showed highest levels of heating. The increase of irradiation time significantly increased the temperature.

scholarly journals Pulp Chamber Heating: An In Vitro Study Evaluating Different Light Sources and Resin Composite Layers

2016 ◽  
Vol 27 (6) ◽  
pp. 675-680 ◽  
Author(s):  
Lígia Maria Lima Andreatta ◽  
Adilson Yoshio Furuse ◽  
Anuradha Prakki ◽  
Juliana Fraga Soares Bombonatti ◽  
Rafael Francisco Lia Mondelli
Keyword(s):  
Light Source ◽  
Irradiation Time ◽  
Resin Composite ◽  
In Vitro Study ◽  
High Irradiance ◽  
Light Sources ◽  
Light Activation ◽  
Pulp Chamber ◽  
Composite Layers

Abstract The aim of the present in vitro study was to evaluate the temperature variation inside the pulp chamber during light-activation of the adhesive and resin composite layers with different light sources. Cavities measuring 8x10 mm were prepared on the buccal surface of bovine incisors, leaving a remaining dentin thickness of 1 mm. Specimens were placed in a 37±1 °C water bath to standardize the temperature. The temperature in the pulp chamber was measured every 10 s during 40 s of light activation of the adhesive system (SBMP-3M/ESPE) and in the three consecutive 1-mm-thick layers of resin composite (Z250-3M/ESPE). Three light source devices were evaluated: Elipar 2500 (QTH), LD Max (LED low irradiance) and VALO (LED high irradiance). The results were submitted to one-way ANOVA with repeated measures and Tukey's test, both with p<0.001. The exothermic reaction warming was observed in the Z250 increments, but not in the SBMP. The high irradiance LED showed a higher temperature average (42.7±1.56 °C), followed by the quartz-tungsten-halogen light (40.6±0.67 °C) and the lower irradiance LED (37.8±0.12 °C). Higher temperature increases were observed with the adhesive and the first resin composite increment light-activation, regardless of the employed light source. From the second increment of Z250, the restorative material acted as a dispersive structure of heat, reducing temperature increases. Regardless the light source and restorative step, the temperature increased with the irradiation time. It may be concluded that the light source, irradiation time and resin composite thickness interfered in the temperature variation inside the pulp chamber.

scholarly journals Impact of systemic cryotherapy on the rheological properties of the blood in women with rheumatoid arthritis

2017 ◽  
Vol 21 (2) ◽  
pp. 4-9
Author(s):  
Bartłomiej Ptaszek ◽  
Aneta Teległów ◽  
Jakub Marchewka
Keyword(s):  
Rheumatoid Arthritis ◽  
Rheological Properties ◽  
Treatment Time ◽  
Venous Blood ◽  
Body Height ◽  
Rheological Parameters ◽  
Study Group ◽  
Mean Values ◽  
Chamber Temperature ◽  
The Mean

Study aim: The aim of this study was to assess the effects of systemic cryotherapy on the rheological properties of the blood in women with rheumatoid arthritis. Study group: The study group consisted of 10 women with rheumatoid arthritis, aged 57.2 ± 9.4, who underwent systemic cryotherapy treatments (3 min treatment time, -120 °C chamber temperature, 10 treatment sessions - 5 times a week). Their average body height was 165.5 ± 4.6 cm, weight 68.5 ± 4.9 kg and BMI 24.8 ± 2.2 kg/m2. In order to analyze morphological and rheological parameters of the blood, venous blood samples were drawn from the participants of the study twice. The first study was held on the day of beginning treatments and the second test was conducted after a series of 10 treatments. Methodology: The morphological blood test - measurements were taken using the ABX MICROS 60 (USA) hematology analyser. Erythrocyte deformability and aggregation were tested using the LORCA analyser (Laser-assisted Optical Rotational Cell Analyser RR Mechatronics, The Netherlands). The results were obtained as the index of elongation and aggregation according to the Hardeman method (2001). Results: Analysing the average values of morphological and rheological parameters of the blood in women with rheumatoid arthritis in the study group, the mean values of RBC, Hct and AI following the series of 10 treatments were significantly higher after cryotherapy in comparison to the measurements taken before treatments. Analysing the mean concentrations of T½, there was statistically significant reduction after the series of 10 treatments. Conclusions: Regular usage of cryotherapy treatments may affect the levels of morphological and rheological parameters of the blood in women with rheumatoid arthritis - RBC, Hct and AI (increase) and T½ (reduction) in the blood. null

A Comparison of Fluorescent and Nonfluorescent Light Sources for Phototherapy

PEDIATRICS ◽  
1980 ◽  
Vol 65 (4) ◽  
pp. 795-798 ◽  
Author(s):  
Joseph B. Warshaw ◽  
Jeryl Gagliardi ◽  
Anil Patel
Keyword(s):  
Serum Bilirubin ◽  
Newborn Infants ◽  
Radiant Flux ◽  
Light Sources ◽  
Halogen Lamp ◽  
The Mean ◽  
Additional Support ◽  
The Relationship ◽  
Tungsten Halogen Lamp ◽  
Practical Measure

We have compared fluorescent and nonfluorescent light sources for phototherapy for newborn infants with hyperbilirubinemia. Phototherapy was provided by a tungsten halogen lamp and conventional fluorescent lights with identical radiant flux of 6 µW/sq cm. For 22 infants treated with the nonfluorescent lamp the mean duration of phototherapy was 33.77 hours and the mean reduction of bilirubin was 3.84 mg/100 ml/day. This did not differ significantly from infants treated with conventional fluorescent lights. The nonfluorescent light can be utilized for infants in incubators or on radiant warmers. These results provide additional support for the relationship between radiant flux as a practical measure of phototherapy dose and the clinical response of a reduction in serum bilirubin.

scholarly journals Which Plosive Consonant Is More Useful for the Aerodynamic Analysis of Pathologic Voice?

2020 ◽  
Vol 13 (2) ◽  
pp. 179-185
Author(s):  
Yong Tae Hong ◽  
Phan Huu Ngoc Minh ◽  
Ki Hwan Hong
Keyword(s):  
Vocal Fold ◽  
Correlation Coefficients ◽  
Vocal Fold Paralysis ◽  
Unilateral Vocal Fold Paralysis ◽  
Acoustic Parameters ◽  
Mean Values ◽  
Aerodynamic Analysis ◽  
Different Types ◽  
Aerodynamic Parameters ◽  
The Mean

Objectives. Both acoustic and aerodynamic analyses are essential to evaluate the phonetic characteristics of voice pathology. The purpose of the study is to determine the magnitude of their correlation with the different types of bilabial plosive consonants.Methods. A controlled prospective study of 35 patients diagnosed with unilateral vocal fold paralysis was performed. The sustained vowel /a/ and bilabial voiceless consonants were used. Three common acoustic parameters were measured from a sustained vowel /a/ and aerodynamic parameters from a set of syllables /pi/, /p<sup>h</sup>i/, and /p’i/. We determined the correlation coefficients between acoustic and aerodynamic measurements for the bilabial plosive consonants /pi/, /p<sup>h</sup>i/, and /p’i/.Results. The mean values of acoustic parameters were higher than the thresholds of pathology. The mean values of aerodynamic parameters varied according to the types of consonants. The correlation between acoustic and aerodynamic parameters was significantly larger with the consonant /p<sup>h</sup>i/ compared with the consonants /p’/ and /p/. The magnitudes of correlation were higher with the consonant /p<sup>h</sup>i/ compared with the consonants /p’/ and /p/.Conclusion. The plosive consonant /p<sup>h</sup>i/ may represent a more valuable investigative consonant than the consonants /p/ or /p’/ for aerodynamic analysis of voice pathology, especially in patients with unilateral vocal fold paralysis.

scholarly journals Ex-vivo evaluation of the intrapulpal temperature variation and fracture strength in teeth subjected to different external bleaching protocols

2011 ◽  
Vol 22 (1) ◽  
pp. 32-36 ◽  
Author(s):  
Renata Araújo Coelho ◽  
Alcides Gomes Oliveira ◽  
Aline Evangelista Souza-Gabriel ◽  
Silvio Rocha C. Silva ◽  
Yara T. Correa Silva-Sousa ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Fracture Strength ◽  
Ex Vivo ◽  
Critical Value ◽  
The Other ◽  
Light Sources ◽  
Pulp Chamber ◽  
Carbamide Peroxide ◽  
Treatment Control ◽  
Halogen Light

This study evaluated the influence of bleaching protocols on intrapulpal temperature and fracture strength of the bleached teeth. Ninety maxillary incisors were assigned to 9 groups (n=10): G1: 35% carbamide peroxide (35% CP), G2: 38% hydrogen peroxide (38% HP), G3: halogen light, G4: LED-laser, G5: 35% CP + halogen light, G6: 38% HP + halogen light, G7: 35% CP + LED-laser, G8: 38% HP + LED-laser, and G9: no treatment (control). Pulp space was widened, a thermocouple was introduced through the apex up to the pulp chamber and the temperature was recorded (°C). The fracture strength (kN) was determined using an Instron machine. Data were analyzed by ANOVA and Tukey's test (p<0.05). The halogen light alone (1.10 ± 0.24) (G3) and associated with 38% HP (1.15 ± 0.30) (G6) produced the highest temperature increase, statistically different (p<0.05) from the other groups. G1 (0.15 ± 0.06) and G6 (0.19 ± 0.07) produced the lowest values, statistically different (p<0.05) from G5 (0.65 ± 0.49). The bleaching protocols increased the temperature, but no increment exceeded the critical value of 5.6°C. Neither 35% CP nor 38% HP or the light sources alone altered the fracture strength of the teeth.

scholarly journals Effect of etching time and light source on the bond strength of metallic brackets to ceramic

2011 ◽  
Vol 22 (3) ◽  
pp. 245-248 ◽  
Author(s):  
Paulo Roberto Amaral Gonçalves ◽  
Rafael Ratto de Moraes ◽  
Ana Rosa Costa ◽  
Américo Bortolazzo Correr ◽  
Paulo Roberto Aranha Nouer ◽  
...  
Keyword(s):  
Bond Strength ◽  
Light Source ◽  
Argon Laser ◽  
Etching Time ◽  
Strength Testing ◽  
Light Sources ◽  
Ceramic Surface ◽  
Light Activation ◽  
Adhesive Remnant Index ◽  
Halogen Light

This study evaluated the bond strength of brackets to ceramic testing different etching times and light sources for photo-activation of the bonding agent. Cylinders of feldspathic ceramic were etched with 10% hydrofluoric acid for 20 or 60 s. After application of silane on the ceramic surface, metallic brackets were bonded to the cylinders using Transbond XT (3M Unitek). The specimens for each etching time were assigned to 4 groups (n=15), according to the light source: XL2500 halogen light, UltraLume 5 LED, AccuCure 3000 argon laser, and Apollo 95E plasma arc. Light-activation was carried out with total exposure times of 40, 40, 20 and 12 s, respectively. Shear strength testing was carried out after 24 h. The adhesive remnant index (ARI) was evaluated under magnification. Data were subjected to two-way ANOVA and Tukey's test (α=0.05). Specimens etched for 20 s presented significantly lower bond strength (p<0.05) compared with those etched for 60 s. No significant differences (p>0.05) were detected among the light sources. The ARI showed a predominance of scores 0 in all groups, with an increase in scores 1, 2 and 3 for the 60 s time. In conclusion, only the etching time had significant influence on the bond strength of brackets to ceramic.

scholarly journals The Impact Of Lexical Stress Type and Position of a Vowel Within a Phrase on Vowel Formant Bandwidths

2020 ◽  
pp. 5-15
Author(s):  
Sergey Batalin
Keyword(s):  
Target Word ◽  
Lexical Stress ◽  
Mean Values ◽  
Acoustic Correlates ◽  
Word Position ◽  
Vowel Formant ◽  
Different Types ◽  
The Mean ◽  
The Impact

The article sets out to explore the impact of different types of lexical stress and word position within a phrase as well as the interaction of these factors on formant bandwidths. The findings contribute to establishing the role of these formant features as acoustic correlates of the Russian lexical stress. The experimental material for analysis is presented by the Russian sound [a] embedded in a word in a natural language carrier phrase. The word position is changed from phrase initial to the phrase final one and in each position the target word is uttered with a neutral and an emphatic stress by four speakers. The Praat software is used to extract the mean values of the first four formant bandwidths of the target vowel. Two-way ANOVA is carried out to establish the significance of difference between neutrally and emphatically stressed vowels in all the three phrasal positions. The impact of phrasal position and stress type is clearly pronounced and is valid for all the four speakers. Specific trends in bandwidth alterations are hard to identify in most cases because of inconsistent fluctuations of formant bandwidths and a heavy influence of the speakers' idiolects: formant bandwidths expand, contract or remain unchanged. An explanation of the results obtained is suggested.

Influence of the degree of dentine mineralization on pulp chamber temperature increase during resin-based composite (RBC) light-activation

2010 ◽  
Vol 38 (4) ◽  
pp. 336-342 ◽  
Author(s):  
Eduardo Moreira da Silva ◽  
Alice Gonçalves Penelas ◽  
Michele Silveira Simão ◽  
Jaime Dutra Noronha Filho ◽  
Laiza Tatiana Poskus ◽  
...  
Keyword(s):  
Temperature Increase ◽  
Light Activation ◽  
Pulp Chamber ◽  
Chamber Temperature

scholarly journals REVIEW: DISSOLVED ORGANIC CARBON CONTENT OF BIOCHAR VARYING WITH THE TYPE OF FEEDSTOCK AND THE PYROLYSIS TEMPERATURE

2017 ◽  
Author(s):  
Enrico MANCINELLI ◽  
Edita BALTRĖNAITĖ ◽  
Pranas BALTRĖNAS ◽  
Raimondas GRUBLIAUSKAS ◽  
Giorgio PASSERINI
Keyword(s):  
Linear Regression ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Pyrolysis Temperature ◽  
Organic Carbon Content ◽  
Mean Values ◽  
Slow Pyrolysis ◽  
Different Types ◽  
Production Temperature ◽  
The Mean

The present review aims at investigating the influence of the type of feedstock and the production temperature on the dissolved organic carbon (DOC) content of biochar (BC) from slow pyrolysis. To collect data from the literature, peer reviewed articles in English published in 2007–2016 were considered. The different types of BC were classified depending on the fractions of cellulose and lignin and the type of feedstock. A linear regression (R-squared = 0.5) of the mean values of DOC content (g/kg) of BC was calculated in the range of 350–800 °C with slope (–0.005) and intercept (4.1) significant at p &amp;lt;0.05. Irrespective of the type of feedstock, slow pyrolysis with temperatures above 500 °C would be a proper choice for limiting the mean DOC content of BC to values in the range of 0.28–1.01 g/kg.

scholarly journals Energy balance in the poultry-shed system and its influence on broiler performance

2015 ◽  
Vol 35 (4) ◽  
pp. 613-624 ◽  
Author(s):  
Tatiana P. N. da Silva ◽  
Héliton Pandorfi ◽  
Cristiane Guiselini
Keyword(s):  
Energy Balance ◽  
Feed Consumption ◽  
Production Cycle ◽  
Productive Performance ◽  
Feed Conversion ◽  
Broiler Performance ◽  
Mean Values ◽  
Significant Difference ◽  
Different Types ◽  
The Mean

ABSTRACT The objective of this study was to determine the energy balance of the poultry-shed system and its effect on broiler performance during the production cycle. The experimental design was completely random with sub-divided blocks. The blocks were composed of five different types of sheds and the sub-blocks of the evaluation times (00:00 h to 23:00 h), allowing an analysis of variance and a comparison between means with the Tukey test. There were no significant differences between the mean values of the exchanges of sensible, latent and total heat between the poultry sheds but the differences for the evaluation times were significant (P<0.05). There was no significant difference between sheds 1 and 4 for broiler productive performance regarding weight gain, feed consumption and feed conversion. Bird performance was significant (P<0.05) for the remaining poultry sheds. The productive indexes remained below the ranges considered ideal for broilers and values in the final weeks were characterized by the poor installation efficiency in controlling temperature variations and, consequently, the energy balance in the system, which adversely affected bird productive performance.

Sign in / Sign up

Export Citation Format

Share Document