scholarly journals The relationship between the storage methods and the formation of dentinal defects (cracks)

2019 ◽  
Vol 67 ◽  
Author(s):  
Fábio Nakao ARASHIRO ◽  
Michelle Tavares Galotto NANTES ◽  
Pedro Gregol da SILVA ◽  
Key Fabiano Souza PEREIRA ◽  
Muryllo Eduardo Sales dos SANTOS
Keyword(s):  
Storage Period ◽  
Root Apex ◽  
Surgical Instruments ◽  
Distilled Water ◽  
Chi Square ◽  
Significance Level ◽  
Significant Difference ◽  
And Storage ◽  
Group 1

ABSTRACT Objective: This research study aims at conducting an in vitro evaluation of crack formation in freshly extracted teeth after undergoing different storage and decontamination methods. Methods: 60 erupted upper third molars conventionally extracted using forceps # 210h (quinelato surgical instruments, rio claro - sp) and randomly distributed in three groups (n = 30): group 1 - storage in dry environment for 30 days, group 2 - sterilization in autoclave and storage for 30 days in distilled water, and group 3 - 10% formaldehyde decontamination for 14 days and storage in distilled water for additional 30 days. after the storage period, teeth had their roots transversely sectioned at 2, 4 and 6 mm below the root apex using a low rotation diamond disk under constant cooling. the evaluation of fragments was performed using a 30-time magnification microscope. Results: Cracks were seen only in group 1 and the chi-square statistical test with 5% significance level showed a statistically significant difference comparing the dry storage group to the others. Conclusion: The storage of extracted teeth in a dry environment influences the formation of dentinal defects.

scholarly journals In vitro evaluation of apical sealing in root apex treated with demineralization agents and retrofiled with mineral trioxide aggregate through marginal dye leakage

2005 ◽  
Vol 16 (3) ◽  
pp. 187-191 ◽  
Author(s):  
Claudio Hideki Kubo ◽  
Ana Paula Martins Gomes ◽  
Maria Nadir Gasparoto Mancini
Keyword(s):  
Mineral Trioxide Aggregate ◽  
Root Apex ◽  
Solution Ph ◽  
Significance Level ◽  
Group 4 ◽  
Group 3 ◽  
Group 2 ◽  
Agent Group ◽  
Group 1

The purpose of this study was to evaluate the apical seal in root apex treated with different demineralization agents and retrofilled with mineral trioxide aggregate (MTA) using marginal dye leakage. Fifty-six, human single-rooted teeth were instrumented, filled, resected and had retrofilling cavities prepared with ultrasonic tips. Demineralizing agents were applied before the apical cavities were retrofilled with Pro Root MTA. The specimens were assigned to 4 groups (n=14), as follows: group 1 (no demineralizing agent); group 2 (35% phosphoric acid, for 15 s); group 3 (17% EDTA solution, pH 7, for 3 min); and group 4 (24% EDTA gel, pH 7, for 4 min). The extension of dye (2% rhodamine B, at 37°C, for 24 h) penetration was measured in millimeters using a stereomicroscope. Results were statistically analyzed by ANOVA and Tukey's test at 5% significance level. Among the experimental groups, the least extension of dye penetration was observed in group 1 (1.89 mm), followed by groups 2 (2.18 mm), 4 (2.54 mm) and 3 (2.64 mm). No statistically significant differences (p<0.05) were found in marginal microleakage among groups 1, 2 and 4 and groups 2, 3 and 4. Based on the results obtained in this study, it may be concluded that the application of demineralizing agents cannot be recommended when MTA is used in periradicular surgeries.

scholarly journals Influence of different dentin drying methods on adhesive behavior of composite restorations

2017 ◽  
Vol 4 (3) ◽  
pp. 73
Author(s):  
Helena Reis De Souza ◽  
Stéfanie Thieme Perotto ◽  
Maria Carolina Guilherme Erhardt ◽  
Fabio Garcia Lima ◽  
Ana Maria Spohr ◽  
...  
Keyword(s):  
Bond Strength ◽  
Adhesive System ◽  
Drying Methods ◽  
Distilled Water ◽  
Chi Square ◽  
Air Drying ◽  
Bonding Agents ◽  
Significance Level ◽  
Composite Resin Restorations

Aim: The aim of this study was to evaluate, in vitro, the influence of four different dentin drying methods (air drying for 10s, absorbent paper, endodontic suction cannula and air drying for 10s with subsequent re-wetting with distilled water), after etching with phosphoric acid gel 37%, on bond strength and microleakage of composite restorations.Material and Methods: Twenty sound bovine incisors were selected and sectioned transversely. The buccal surfaces were frayed until exposure of dentin, etched and washed with distilled water. Each specimen was subjected to one of the four different drying methods. A 3-step total-etch adhesive system (Adper Scotchbond™ Multi-Purpose) was used on 10 teeth and on the other 10, a 2-step total-etch adhesive system (Adper Single BondT™ 2) was used. Composite resin restorations in cylindrical shapes were made and, after thermocycling, the teeth were subjected to the microshear bond strength test. Cervical areas of the teeth were prepared and restored with the same techniques describe above. Cervical restorations were cut and subjected to microleakage analysis in the cervical margin. Data obtained were tabulated and statistically analyzed, using ANOVA, Chi-square and Kruskal-Wallis tests, and the significance level was set at 5%.Results: The results showed no statistically significant differences among the groups tested.Conclusions: It was concluded that all drying methods tested represent feasible alternatives to clinical application for total etch dentin-bonding agents.

scholarly journals Effect of Polymerization Time on Residual Monomer Release in Dental Composite: In Vitro Study

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Ezgi Sonkaya ◽  
Zeliha Gonca Bek Kürklü ◽  
Şeyhmus Bakır
Keyword(s):  
High Performance ◽  
Storage Period ◽  
In Vitro Study ◽  
Composite Resins ◽  
Dental Composite ◽  
Polymerization Time ◽  
Residual Monomer ◽  
Significant Difference ◽  
And Storage

Light activated resin-based composites are the most accepted and used materials among clinicians. The aim of this study is to determine the amount of residual monomer released from nanofiller composite resins for different polymerization times and storage periods in vitro. To this purpose, Tetric Ceram (Ivoclar, Liechtenstein), Clearfil Majesty Posterior (Kuraray, Japan), Grandio (VOCO, Germany), and Filtek Ultimate Universal (3M, USA) were used as nanofiller resin composites samples. Four groups ( n = 40 , diameter: 5 mm, thickness: 2 mm) of each material were fabricated, and each group was exposed to three different polymerization time (10, 20 and 40 sec). High-performance liquid chromatography (HPLC) was used to measure the amount of monomers released over 1, 15, and 30 days. The highest amount of monomer release was seen in Tetric EvoCream composite, while the least monomer release was seen in Clearfil Majesty composite. Regardless of the polymerization time, material, or storage period, the highest amount of eluted monomer was Bis-GMA. It is observed that there is no statistically significant difference between various polymerization times. Monomer release reached its highest level on the 15th day and decreased on the 30th day for all composites. Polymerization time did not affect the monomer release from the composites, but the type of the monomers and concentration of the filler used in the composites affected the amount of released monomers. The use of TEGDMA (co)monomer reduced the monomer release.

Influence of Location of the Gingival Margin on the Microleakage and Internal Voids of Nanocomposites

2008 ◽  
Vol 9 (7) ◽  
pp. 65-72 ◽  
Author(s):  
Emre Ozel ◽  
Yonca Korkmaz ◽  
Nuray Attar
Keyword(s):  
Bonferroni Correction ◽  
Chi Square ◽  
Gingival Margin ◽  
Group 4 ◽  
Significant Difference ◽  
Chi Square Test ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Abstract Aim The aim of this in vitro study was to investigate the cervical microleakage and internal voids of nanocomposites comparing them with a hybrid composite in Class II restorations with the margins located coronal and apical to the cementoenamel junction (CEJ). Methods and Materials Standardized MOD cavities (one cervical margin located in dentin, one in enamel) were prepared in 40 extracted human molars and divided into four groups according to the composite used to restore them (n=10/group). Group 1: Adper Single Bond2/Filtek Supreme XT; Group 2: Excite/Tetric EvoCeram; Group 3: Prime & BondNT/Ceram X; and Group 4 (control) Adper Single Bond2/Filtek Z250. Groups were further divided into subgroups A and B. The “A” subgroups represent the level of the location of the cervial margin at 1 mm coronal to the CEJ, and the “B” subgroups represent the level of the cervical margin located 1 mm apical to the CEJ. After restoration of the cavities with nanocomposites, thermocycling, and immersion in 0.5% basic fuchsin, the dye penetration and internal voids were evaluated under a stereomicroscope. Data were analyzed with the Mann-Whitney U and Kruskal-Wallis tests with the Bonferroni correction for microleakage and with the Chi-square test for internal voids (p<0.05). Results The microleakage in the A subgroups was statistically significantly lower then B subgroups (p<0.05). No statistically significant difference was observed in terms of interface, cervical, and occlusal voids for all groups (p>0.05). No significant difference was observed between each group for three voids in all groups (p>0.05). Conclusion The location of the gingival margin affects the microleakage of nanocomposites but has no significant affect on the internal voids. Clinical Significance Gingival margin located 1 mm coronal to the CEJ provided a reduction in cervical microleakage in nanocomposite restorations. Citation Ozel E, Korkmaz Y, Attar N. Influence of Location of the Gingival Margin on the Microleakage and Internal Voids of Nanocomposites. J Contemp Dent Pract 2008 November; (9)7:065-072.

scholarly journals A Flexible Multidose GnRH Antagonist versus a Microdose Flare-Up GnRH Agonist Combined with a Flexible Multidose GnRH Antagonist Protocol in Poor Responders to IVF

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Gayem İnayet Turgay Çelik ◽  
Havva Kömür Sütçü ◽  
Yaşam Kemal Akpak ◽  
Münire Erman Akar
Keyword(s):  
Gnrh Agonist ◽  
Gnrh Antagonist ◽  
Poor Responders ◽  
Vitro Fertilization ◽  
Significant Difference ◽  
Gnrh Antagonist Protocol ◽  
Group 2 ◽  
Antagonist Protocol ◽  
Group 1

Objective. To compare the effectiveness of a flexible multidose gonadotropin-releasing hormone (GnRH) antagonist against the effectiveness of a microdose flare-up GnRH agonist combined with a flexible multidose GnRH antagonist protocol in poor responders to in vitro fertilization (IVF).Study Design. A retrospective study in Akdeniz University, Faculty of Medicine, Department of Obstetrics and Gynecology, IVF Center, for 131 poor responders in the intracytoplasmic sperm injection-embryo transfer (ICSI-ET) program between January 2006 and November 2012. The groups were compared to the patients’ characteristics, controlled ovarian stimulation (COH) results, and laboratory results.Results. Combination protocol was applied to 46 patients (group 1), and a single protocol was applied to 85 patients (group 2). In group 1, the duration of the treatment was longer and the dose of FSH was higher. The cycle cancellation rate was significantly higher in group 2 (26.1% versus 38.8%). A significant difference was not observed with respect to the number and quality of oocytes and embryos or to the number of embryos transferred. There were no statistically significant differences in the hCG positivity (9.5% versus 9.4%) or the clinical pregnancy rates (7.1% versus 10.6%).Conclusion. The combination protocol does not provide additional efficacy.

Effects of Relationship Enrichment Training on Improving Marital Satisfaction of Infertile Couples: A Randomized Control Trial

2021 ◽  
Vol 17 ◽  
Author(s):  
Seyedeh Zahra Masoumi ◽  
Khodayar Oshvandi ◽  
Masoumeh Rostami-Moez ◽  
Arezoo Shayan ◽  
Farideh Kazemi
Keyword(s):  
Marital Satisfaction ◽  
Intervention Group ◽  
Analysis Of Covariance ◽  
Control Group ◽  
Chi Square ◽  
Significance Level ◽  
Significant Difference ◽  
The Mean ◽  
Infertile Couples ◽  
Relationship Enrichment

Background: Infertility can cause low marital satisfaction. Marital satisfaction has an important effect on infertile couples’ health. Objective: This study aimed to assess the effect of relationship enrichment training on improving the marital satisfaction of infertile couples. Methods: This randomized clinical trial was conducted on 50 infertile couples in the infertility center of Fatemieh Hospital in Hamadan, Iran in 2018. Participants were matched for demographic characteristics and randomly assigned to intervention and control groups (each group had 25 couples). Informed consent was obtained from all participants. The Enrich Marital Satisfaction questionnaire and demographic information were used to collect data before the study and two months after the intervention. Two trained midwifery students taught only the intervention group the relationship enrichment topics in seven sessions (each session = 90 minutes). The data were analyzed by SPSS Statistics version 21 using analysis of covariance, independent t-test, chi-square, and Mann–Whitney. The significance level was set at p ≤ 0.05. Results: There was no significant difference in demographic and obstetric information between the two groups (p >0.05). The mean of marital satisfaction in the intervention group significantly increased among women and men from 151.00 ±28.61 to 154.88 ±22.62 and from 152.56 ±27.33 to 159.24 ±22.14, respectively, (p <0.001). Conversely, the mean of marital satisfaction decreased among women and men from 158.13 ±13.86 to 146.25 ±19.53 and from 164.25 ±17.00 to 153.17 ±27.50 in the control group (p=0.02). Conclusion: Relationship enrichment training can be effective in promoting the marital satisfaction of infertile couples. Registration number: The National Center for Strategic Research in medical education, No. 960185.

Resorbable Collagen Barrier Impeding the Extrusion of Obturating Material in Primary Molars Undergoing Resorption – A Randomized Clinical Trial

2021 ◽  
Vol 45 (5) ◽  
pp. 312-316
Author(s):  
Mishra Neha Sanjeev ◽  
Harsimran Kaur ◽  
Sandeep Singh Mayall ◽  
Rishika ◽  
Ramakrishna Yeluri
Keyword(s):  
Test Group ◽  
Primary Molars ◽  
Control Group ◽  
Chi Square ◽  
Significance Level ◽  
Significant Difference ◽  
Chi Square Test ◽  
Group A ◽  
Group B ◽  
And Control

Objective: To evaluate the effectiveness of placing a resorbable collagen barrier in impeding the extrusion of obturation material in primary molars undergoing resorption. Study design: All the 94 canals in 47 mandibular molars were allocated to 2 groups- Group ‘A’- 47 canals with collagen barrier (Test group) and Group ‘B’- 47 canals without collagen barrier (Control group) based on randomization protocol. Pulpectomy was performed and obturation of both test and control canals were radiographically assessed. Pearson’s chi – square test was applied to analyze the results. The significance level was predetermined at p &lt; 0.05. Results: Among the test group, 93.6% of the canals showed no extrusion while, 6.4% showed visible extrusion of the material outside the apex. In the control group, 83% showed no extrusion whereas 17% of the canals showed visible extrusion outside the apex. But no significant difference was noted (p&gt;0.05). Conclusion: The placement of resorbable collagen barrier in the apical third of the canal prevented the extrusion of obturating material beyond the apex in resorbing primary molars.

scholarly journals Is there an association between skeletal asymmetry and tooth absence?

2016 ◽  
Vol 21 (4) ◽  
pp. 73-79 ◽  
Author(s):  
Guilherme Thiesen ◽  
Bruno Frazão Gribel ◽  
Keila Cristina Rausch Pereira ◽  
Maria Perpetua Mota Freitas
Keyword(s):  
Cross Sectional Study ◽  
Midsagittal Plane ◽  
Chi Square ◽  
Cross Sectional ◽  
Posterior Teeth ◽  
Significance Level ◽  
Posterior Tooth ◽  
Mandibular Asymmetry ◽  
Significant Difference ◽  
Skeletal Asymmetry

ABSTRACT Introduction: Facial skeletal asymmetry is commonly found in humans and its main characteristic is menton deviation. The literature suggests that occlusal and masticatory problems arising from tooth absence could be related to the development of such asymmetries. Objective: The aim of this cross-sectional study was to estimate the prevalence of mandibular skeletal asymmetries and to investigate its association with posterior tooth absences. Methods: Tomographic images of 952 individuals aged from 18 to 75 years old were used. Asymmetry was the analyzed outcome, and it was categorized into three groups according to gnathion displacement in relation to the midsagittal plane (relative symmetry, moderate asymmetry, and severe asymmetry). Patients were sorted by the presence of all posterior teeth, unilateral posterior tooth absence, or bilateral posterior tooth absence. Chi-square test with a significance level of 5% was used to verify the association between posterior tooth absence and asymmetry. Results: Results show relative symmetry present in 55.3% of the sample, as well as the prevalence of 27.3% for moderate mandibular asymmetry and 17.4% for severe asymmetry. Moderate and severe mandibular asymmetries occurred in a higher proportion in patients with unilateral posterior tooth absence. However, there was no statistically significant difference between the analyzed groups (p = 0.691). Conclusions: In this study, mandibular asymmetries did not present any association with the absence of teeth on the posterior area of the arch.

scholarly journals Self-etching primer: the effect of contamination with a mixture of saliva and blood on bonding metallic brackets

2013 ◽  
Vol 1 (2) ◽  
pp. 175
Author(s):  
Bernardo Urbanetto Peres ◽  
Felipe Weidenbach Degrazzia ◽  
Renésio Armindo Ghers ◽  
Fabíola Rossato Arrais ◽  
Vilmar Antonio Ferrazzo
Keyword(s):  
Standard Deviation ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Color Change ◽  
Homogeneous Distribution ◽  
Distilled Water ◽  
Significant Difference ◽  
Student Test ◽  
Group 2 ◽  
Group 1

PURPOSE: To evaluate the shear bond strength (SBS) of metallic brackets bonded with Transbond Plus Self-Etching Primer (TPSEP) and Transbond Plus Color Change (TPCC) under contamination with a mixture of saliva and blood. MATERIALS AND METHODS: 42 human premolars were randomly divided into 2 groups (n=21). Group 1 (G1) were bonded under no contamination, and Group 2 (G2) was contaminated with saliva/blood before bonding. Both groups were bonded according to the manufacturer’s instructions and were cleaned with pumice before bonding. The shear bond strength (SBS) tests were performed after 24 hours in distilled water at 37°C and after thermocycling. RESULTS: Both groups showed a homogeneous distribution in the Levene’s test (p>0.05). The main shear bond strength value of G1 was 8.89 MPa with a standard deviation of 2.27; the value for G2 was 6.00 MPa with a standard deviation of 2.62 MPa. There was a significant difference between G1 and G2 (t-student test p<0.05). IRA scores indicated that the main value was IRA 0, and no significant difference (α=0.05) was found between the groups. CONCLUSION: Contamination of blood mixed with saliva significantly decreases the shear bond strength, but even so, the performance is clinically acceptable.

scholarly journals Position of lips and tongue in rest in newborns with and without ankyloglossia

CoDAS ◽  
2021 ◽  
Vol 33 (6) ◽  
Author(s):  
Silvia Márcia Andrade Campanha ◽  
Roberta Lopes de Castro Martinelli ◽  
Durval Batista Palhares
Keyword(s):  
Visual Inspection ◽  
Cross Sectional Study ◽  
University Hospital ◽  
Sectional Study ◽  
Hospital Data ◽  
Chi Square ◽  
Cross Sectional ◽  
Significance Level ◽  
Significant Difference ◽  
Chi Square Test

ABSTRACT Purpose Verify the position of lips and tongue at rest in newborns with and without ankyloglossia. Methods Cross-sectional study, carried out with 130 newborns in University Hospital. Data collection was performed by the researcher and speech-language pathologists from the Hospital. Information on gestational age, sex, weight, height and days of life was collected. The position of the lips and tongue at rest was evaluated through visual inspection with the newborns asleep. After the newborns were awakened, Neonatal Screening of the validated Protocol for the evaluation of the lingual frenulum for infants was performed to detect the alteration of the lingual frenulum. The data obtained were described and submitted to statistical analysis using the Chi-Square test to verify the association between the position of the lips with the tongue and to compare the position of the lips and tongue with and without ankyloglossia. The Mann-Whitney test was used to verify the behavior of the variables the differed between newborns with and without ankyloglossia. The significance level of 5% was adopted. Results When comparing the data, a significant difference was found between: weight and height with and without ankyloglossia; position of lips and tongue. An association between the position of the tongue and lips with and without ankyloglossia was also found. Conclusion Newborns without alteration of the lingual frenulum have a tendency to remain with their lips closed and their tongue elevated during rest and newborns with ankyloglossia have a tendency to keep their lips parted and their tongue low during rest.

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