scholarly journals Area and Volume of Remaining Cement and Enamel after Removal and Polishing of Buccal or Lingual Multibracket Appliances

2021 ◽  
Vol 11 (4) ◽  
pp. 1719
Author(s):  
Alba Belanche Monterde ◽  
Alberto Albaladejo Martínez ◽  
Adrián Curto ◽  
Jorge Alonso Pérez-Barquero ◽  
Clara Guinot-Barona ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Statistical Analysis ◽  
Epoxy Resin ◽  
Measurement Technique ◽  
Dental Arch ◽  
Digital Measurement ◽  
Student’S T ◽  
Multibracket Appliance ◽  
Student’S T Test ◽  
Area And Volume

The aim of the present study was to compare the area and volume of remaining cement after lingual and buccal multibracket appliance debonding. Further, the area and volume of cement remaining and the area and volume of enamel were also analyzed using a morphometric digital measurement technique. Ten buccal and 10 lingual multibracket appliances were cemented in 20 extracted teeth embedded into an epoxy resin model simulating a dental arch. The models were scanned before bonding the lingual and buccal multibracket appliances, after debonding the lingual and buccal multibracket appliances, and after polishing the remaining cement. Afterwards, the standard tessellation language (STL) digital files were aligned, segmented, and realigned by using engineer morphometry software. A comparative analysis was performed using Student’s t test statistical analysis. Lingual appliances showed statistically significantly (p < 0.001) less area (7.07 ± 4.85 mm2) and volume (0.87 ± 1.34 mm3) of remaining cement than the area (21.99 ± 4.18 mm2) and volume (p = 0.002) (3.48 ± 0.96 mm3) of buccal appliances. Moreover, lingual appliances showed statistically significantly (p = 0.001) less area (4.48 ± 3.08 mm2) and volume (0.13 ± 0.15 mm3) of remaining cement after polishing than the area (12.22 ± 5.98 mm2) and volume (p = 0.004) (0.70 ± 0.56 mm3) of buccal appliances. Lingual multibracket appliance therapy leads to less area and volume of cement remaining after multibracket appliance debonding and less area and volume of cement remaining after cement polishing than buccal multibracket appliance therapy; however, the area and volume of enamel removed after cement polishing were similar between both lingual and buccal multibracket appliance therapies.

scholarly journals A Repeatable and Reproducible Digital Method to Quantify the Cement Excess and Enamel Loss after Debonding Lingual Multibracket Appliance Therapy

2021 ◽  
Vol 11 (3) ◽  
pp. 1295
Author(s):  
Alba Belanche Monterde ◽  
Alberto Albaladejo Martínez ◽  
Alfonso Alvarado Lorenzo ◽  
Adrián Curto ◽  
Jorge Alonso Pérez-Barquero ◽  
...  
Keyword(s):  
Measurement Technique ◽  
Measurement Method ◽  
Dental Arch ◽  
Micro Computed Tomography ◽  
Morphometric Measurement ◽  
Before And After ◽  
Repeatability And Reproducibility ◽  
Lingual Brackets ◽  
Multibracket Appliance ◽  
Area And Volume

The aim of the present study is to present a repeatable, reproductible, and accurate morphometric measurement method for measuring and quantifying the area and volume of cement that remains after fixed lingual multibracket appliance debonding, enamel loss after fixed lingual multibracket appliance debonding, and the volume of cement used to adhere fixed lingual multibracket appliances. Ten conventional lingual brackets were cemented in 10 extracted teeth embedded into an epoxy resin model simulating a dental arch. This model was scanned before and after bonding the lingual brackets, after debonding, and after polishing the surfaces. We also performed a Micro-Computed Tomography scan of the lingual brackets used. Afterward, the standard tessellation language (STL) digital file was aligned, each tooth was segmented individually, and the file was re-aligned using engineer morphometry software. Inter-operator and intra-operator comparative analyses were performed using the ANOVA test, and the repeatability and reproducibility of the morphometric measurement technique were analyzed using Gage R&R statistical analysis. Repeatability showed 0.07% and 0.16% variability associated with the area and volume measures, respectively, while reproducibility showed 0.00% variability associated with the area and volume measures, respectively. In conclusion, the morphometric measurement technique is a repeatable, reproductible, and accurate morphometric measurement method for quantifying the area and volume of cement that remains after fixed lingual multibracket appliance debonding, enamel loss after fixed lingual multibracket appliance debonding, and the volume of cement used to adhere fixed lingual multibracket appliances.

scholarly journals Hardiness of Young People and Pre-Retirement Age People Living in the Republic of Tuva

2021 ◽  
Vol 35 ◽  
pp. 67-83
Author(s):  
S. M. Mombey-ool ◽  
◽  
C. N. Mongush ◽  
V. L. Sitnikov ◽  
S. I. Kedich ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Statistical Analysis ◽  
Young People ◽  
Risk Taking ◽  
T Test ◽  
Retirement Age ◽  
Sense Of Control ◽  
The Republic ◽  
Student’S T ◽  
Student’S T Test

The article presents the results of the comparative analysis of hardiness of young people between the ages of 18 and 35, and pre-retirement people with the help of Maddi’s Hardiness Test modified by D. Leontyev. Student’s t-test has been used to verify credibility of differences between two independent samplings. Mathematical and statistical analysis used to compare the results of young and pre-retirement age people’s survey has shown that people approaching retirement age are more resilient then young people and people before the age of 35. Young people have proved to show risk-taking behavior more, while persons nearing retirement age are more involved into and have a sense of control of their own life as opposed to young people. According to all the parameters studied these two groups showed significant differences.

scholarly journals Effect of the ketoprofen on the preemptive analgesia in female cats undergoing to ovariohysterectomy

Revista CERES ◽  
2017 ◽  
Vol 64 (1) ◽  
pp. 18-24
Author(s):  
Dayvid Vianêis Farias de Lucena ◽  
Fernanda Vieira Henrique ◽  
Amara Gyane Alves de Lima ◽  
Almir Pereira de Souza ◽  
Pedro Isidro da Nóbrega Neto
Keyword(s):  
Statistical Analysis ◽  
Preemptive Analgesia ◽  
Pain Scores ◽  
Significant Difference ◽  
Reduction Of Pain ◽  
Baseline Values ◽  
Student’S T ◽  
Level Of Significance ◽  
Postoperative Administration ◽  
Student’S T Test

ABSTRACT The objective of this study was to investigate the effect of the ketoprofen on the preemptive analgesia in female cats submitted to ovariohysterectomy. Sixteen healthy cats were distributed into two groups, with eight animals each, by means of a draw, in a preemptive group (PREG), in which the animal received ketoprofen (1 mg/kg) subcutaneously two hours before the surgery; and postsurgery group (POSG), in which ketoprofen (1 mg/kg) was administered subcutaneously immediately after surgery. In both groups, ketoprofen was given 24, 48 and 72 hours after the first adminstration. Heart and respiratory frequencies and glycemia were measured in all animals during the days first ten postsurgery. Analgesia was measured by assigning scores at zero, two, four, six, 12, 24, 48, 72, 96, 120, 144, 168, 192, 216 and 240 hours after the surgical procedure. Statistical analysis was performed using two-way analysis of variance followed by Tukey's test to compare the moments and Student's t-test for comparison between groups. Pain scores were evaluated using test of U-Mann-Withney or Kruskall-Wallis, all at the 5% level of significance. Pain scores were significantly lower in PREG in M0, M6, M72, M96 and M120. No significant difference was found in the levels of glycemia in comparison to baseline values. Ketoprofen promotes postsurgery analgesia in female cats submitted to ovariohysterectomy and preemptive and postsurgery administration provides an earlier reduction of pain scores when compared to postoperative administration, only.

scholarly journals Respiratory changes in Parkinson's disease may be unrelated to dopaminergic dysfunction

2012 ◽  
Vol 70 (11) ◽  
pp. 847-851 ◽  
Author(s):  
Luciana Ulhôa Guedes ◽  
Juliana Melo Rodrigues ◽  
Aline Andrioni Fernandes ◽  
Francisco E. Cardoso ◽  
Verônica Franco Parreira
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Statistical Analysis ◽  
Healthy Controls ◽  
Maximal Inspiratory Pressure ◽  
Age And Gender ◽  
Dopaminergic Dysfunction ◽  
And Gender ◽  
Student’S T ◽  
Student’S T Test

OBJECTIVE: To investigate the maximal inspiratory pressure (MIP) and maximal expiratory pressure (MEP) in patients with Parkinson's disease (PD) during the on and off periods of levodopa and to compare with healthy controls. METHODS: Twenty-six patients were analyzed with Hoehn and Yahr scores (2-3) and 26 age and gender matched-controls. Statistical analysis was performed with Student's t-test for paired and independent samples. RESULTS: MIP and MEP values in patients were significantly lower than the values obtained in controls both for off and on stages -excepted for MIP in women (p=0.28). For patients with PD, the studied parameters did not differ between stages on and off, with the exception of MEP in women (p=0.00). CONCLUSIONS: Patients with PD have respiratory pressure lower than controls, even in early stages of the disease, and dopamine replacement has little impact over these respiratory pressures. These findings suggest that respiratory changes in PD may be unrelated to dopaminergic dysfunction.

scholarly journals The influence of proteinuria on tubular transport of Na+, K+, CL

2002 ◽  
Vol 130 (3-4) ◽  
pp. 64-67
Author(s):  
Dejan Petrovic ◽  
Radmila Obrenovic ◽  
Mileta Poskurica ◽  
Biljana Stojimirovic
Keyword(s):  
Statistical Analysis ◽  
Creatinine Clearance ◽  
Significant Influence ◽  
Fractional Excretion ◽  
T Test ◽  
The Third ◽  
Tubular Transport ◽  
Student’S T ◽  
Student’S T Test

Functional and structural damages of tubulointerstitium are caused by proteinuria. The aim of this study was to assess the influence of different proteinuria levels on Na+, K+, Cl tubular transport. We examined 50 patients (24 males, 26 females), mean age 46.50 ? 13.08 years, with mean creati-nine clearence of 87.29 ? 31.17 mL/min. They were separated in three groups depending on proteinuria value. The first group with proteinuria less than 0.3 g/24h included 19 persons (7 males, 12 females), mean age 45.12 ? 13.28 years, with mean creatinine clearance of 94.27 ? 34.70 mL/min. The second group of 18 patients (8 males, 10 females), mean age 45.39 ? 12.64 years had proteinuria of 0.3-3,0 g/24h and mean creatinine clearance of 90.07 ? 31.89 mL/min. The third group had proteinuria level higher than 3.0g/24h and mean creatinine clearance of 73.25 ? 20.44 mL/min. It included 13 patients (9 males, 4 females), mean age 50.08 ? 13.73 years. As a parameter of proteinuria influence on tubular transport of Na+, K+ and Cl-, fractional excretion of these electrolytes, was studied. Student's T test, Mann Whitney U test and c2 test were used for statistical analysis. No statistically significant influence of proteinuria was found on Na+, K+ and Cl tubular transport.

Dr. Arnaud Replies

PEDIATRICS ◽  
1977 ◽  
Vol 60 (5) ◽  
pp. 761-761
Author(s):  
Sara B. Arnaud
Keyword(s):  
Vitamin D ◽  
Statistical Analysis ◽  
Vitamin D Deficiency ◽  
Statistical Comparison ◽  
Hydroxyvitamin D ◽  
Number Of Patients ◽  
25 Hydroxyvitamin D ◽  
Deficiency Rickets ◽  
Student’S T ◽  
Student’S T Test

Drs. Giangiacomo and Gleason are quite correct in their criticism that the number of patients with vitamin D deficiency rickets is too small for statistical comparison of the concentration of serum 25-hydroxyvitamin D (25-OH-D) in mild, moderate, and severe rickets. For this reason, we did not attempt this type of statistical comparison (Student's t test). The statistical analysis which supports our conclusion is the calculation of the regression between senim 25-OH-D, ng/ml and the stage of the disease, designated by arbitrary numbers 1, 2, and 3 for mild, moderate, and severe.

scholarly journals A Study to Relate Sagittal Condylar Path and Horizontal Incisal Path with Bilateral Balanced Occlusion in Edentulous Subjects

2020 ◽  
Vol 10 (01) ◽  
pp. 31-41
Author(s):  
Krishna Prasad D. ◽  
B. Rajendra Prasad ◽  
Anupama Prasad D.
Keyword(s):  
Statistical Analysis ◽  
T Test ◽  
Blue Color ◽  
Age Group ◽  
Centric Relation ◽  
Pearson Coefficient ◽  
Coefficient Corrélation ◽  
Student’S T ◽  
Artificial Teeth ◽  
Student’S T Test

Abstract Introduction Bilateral balanced occlusion is achieved when there is equilibrium on both sides of the prosthesis, due to the simultaneous contact of the artificial teeth in centric and eccentric occlusion. One of the areas in which research is lacking is the relation between sagittal condylar path (CP) and horizontal incisal path (IP) with optimal balanced occlusion. Materials and Methods Semiadjustable Articulator Artex Arcon AP with Rotofix facebow, 40 µ Bosch articulating paper of red and blue color, protractor, centric and protrusive interocclusal plaster records were used for the study on 50 completely edentulous subjects. Teeth arrangement was done with optimal balanced occlusion, and the numbers of contacts were recorded in centric relation and eccentric positions. Statistical analysis was done by using student’s t test and Karl Pearson coefficient correlation. Results The average sagittal CP was 30.38° in the age group of 40 to 55 years and 32.58° in the age group of 56 to 70 years, and the average horizontal IP was 15.79° in the age group of 40 to 55 years and 16.04° in the age group of 56 to 70 years.Statistically significant results were found between sagittal CP, horizontal IP with bilateral balanced occlusion in the age group of 40–55 years. Conclusion Statistically significant relations were found in balanced occlusion between waxed up denture on articulator, processed denture on articulator and processed denture on articulator after selective grinding. Balanced occlusion is more predictable in a younger group of individuals.

An Aphid Sex Attractant

1970 ◽  
Vol 1 (1) ◽  
pp. 63-73 ◽  
Author(s):  
Jan Pettersson
Keyword(s):  
Statistical Analysis ◽  
Sex Attractant ◽  
T Test ◽  
Chemical Signal ◽  
Larval Instars ◽  
Student’S T ◽  
Student’S T Test

AbstractThe experiments described have given the following conclusions: (I) A chemical signal (pheromone) emitted by the oviparous female has an attractive effect upon the males. This signal is not emitted by the virginogeniae. (2) The signal is emitted by organs situated on the hind tibiae of the oviparous female and perceived by organs on the male antennae. (3) The substance is only emitted by the females during a certain period in their lifetime. Apparently, this is principally the condition which has been called active copulatory period (ACP). No emittance was found neither during the passive precopulatory period (PPP) nor during the passive postcopulatory period (PCP). (4) Males are capable of detecting and reacting to the signal already in the last two larval instars. (5) The males do not emit any substance affecting other males. Statistical analysis (Student's t-test) of the material has been excluded as it gave significance only in experiments where differences between the stimuli are apparent.

scholarly journals Assessment protocols for forward masking in Frequency-Following Response

Revista CEFAC ◽  
2020 ◽  
Vol 22 (6) ◽  
Author(s):  
Denise Costa Menezes ◽  
Silvana Maria Sobral Griz ◽  
Anne Karoline Lima de Araújo ◽  
Leonardo Gleygson Angelo Venâncio ◽  
Karina Paes Advincula ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Forward Masking ◽  
Wilcoxon Test ◽  
Significance Level ◽  
Frequency Following Response ◽  
Normality Test ◽  
Significant Difference ◽  
Absolute Latency ◽  
Student’S T ◽  
Student’S T Test

ABSTRACT Purpose: to investigate forward masking by comparing latencies values of positive and negative peaks in frequency-following responses (FFR) recordings, in normally hearing young adults. Methods: from a database, 20 FFR recordings were selected, 10 being from men, and 10 from women, aged 18 to 25 years, with normal hearing. They were qualitatively analyzed by two experienced researchers and also analyzed, according to two different protocols of recording identification: (i) predominance of positive peaks - PV, A, PW, PX, PY, PZ, and O waves; and (ii) predominance of negative peaks - V, A, C, D, E, F, and O waves. The Shapiro-Wilk normality test, the Wilcoxon test, and the Student’s t-test were conducted, by adopting the significance level of p<0.05. Results: the comparative analysis of latency peak values did not reveal any significant difference between the studied protocols. However, the standard deviation was higher for absolute latency values as compared to negative peaks, suggesting an inverted pattern of what was expected. Conclusion: forward masking was identified in both proposals and the protocol of predominant positive peaks was less variable.

Analysis of Sulfites in Shrimp Using Rapid Distillation Followed by Redox Titration1

1988 ◽  
Vol 51 (2) ◽  
pp. 137-138 ◽  
Author(s):  
MARIAN V. SIMPSON ◽  
W. STEVEN OTWELL ◽  
MAURICE R. MARSHALL ◽  
JOHN A. CORNELL
Keyword(s):  
Statistical Analysis ◽  
Steam Distillation ◽  
Accurate Determination ◽  
T Test ◽  
Distillation Method ◽  
Student’S T ◽  
Student’S T Test

The use of rapid steam distillation followed by redox iodine titration provides a rapid and accurate determination of total sufite residual in shrimp. Values obtained for sulfite-treated shrimp using the rapid distillation method gave comparable results to those of the officially recognized Monier-Williams method. Values for the rapid distillation method ranged from 6 to 212 ppm while those of the Monier-Williams procedure ranged from 6 to 241 ppm for untreated and treated shrimps, respectively. Statistical analysis using two-sample Student's t-test indicated that there were no significant differences (p&gt;0.05) for residual levels below 100 ppm but the values obtained by the rapid distillation method and the Monier-Williams procedure were significantly different (p&lt;0.05) at concentrations near and above 100 ppm.

Sign in / Sign up

Export Citation Format

Share Document