scholarly journals Efficacy of Esthetic Retainers: Clinical Comparison between Multistranded Wires and Direct-Bond Glass Fiber-Reinforced Composite Splints

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Andrea Scribante ◽  
Maria Francesca Sfondrini ◽  
Simona Broggini ◽  
Marina D'Allocco ◽  
Paola Gandini
Keyword(s):  
Stainless Steel ◽  
Resin Composite ◽  
Steel Wire ◽  
Randomized Study ◽  
Rank Test ◽  
Glass Fiber Reinforced ◽  
Kaplan Meier ◽  
Level Of Satisfaction ◽  
Bond Glass ◽  
Orthodontic Retainers

The purpose of this longitudinal prospective randomized study was to evaluate the reliability of two different types of orthodontic retainers in clinical use: a multistrand stainless steel wire and a polyethylene ribbon-reinforced resin composite. Moreover the level of satisfaction of the patient about the esthetic result was also analyzed by means of a Visual Analogue Scale (VAS). 34 patients (9 boys and 25 girls, mean age 14.3), in the finishing phase of orthodontic treatment, were selected for the study. Since splints were applied the number, cause, and date of splint failures were recorded for each single tooth over 12 months. Statistical analysis was performed using a paired -test, Kaplan Meier survival estimates, and the log-rank test. Kruskal Wallis test was performed to analyze VAS recordings. Differences between the bond failure rates were not statistically significant. Esthetic result of VAS was significantly higher for polyethylene ribbon-reinforced resin retainers than for stainless steel wires.

scholarly journals Survival Rates of Class II Restoration in Primary Molar with Flowable Resin Composite

2021 ◽  
Vol 48 (1) ◽  
pp. 12-20
Author(s):  
Hyejun Seo ◽  
Soyoung Park ◽  
Eungyung Lee ◽  
Taesung Jeong ◽  
Jonghyun Shin
Keyword(s):  
Stainless Steel ◽  
Survival Rate ◽  
Resin Composite ◽  
Survival Rates ◽  
Class Ii ◽  
Primary Molars ◽  
Primary Molar ◽  
Proximal Caries ◽  
Kaplan Meier ◽  
Significant Difference

The purpose of this retrospective study was to evaluate the survival rate by comparing Class II restoration using flowable resin composite with stainless steel crown in primary molars.Electronic medical records and radiographs of 1,504 primary molars with proximal caries of 590 patients from June 2015 to August 2019 were analyzed. With the collected data, survival analysis was performed using the Kaplan-Meier method.The 1-year survival rate of flowable resin composite in the primary molar was 98.5%, 3-year survival rate was 87.7%, and mean survival time was 39 months. There was no statistically significant difference between flowable resin composite and stainless steel crown (<i>p</i> = 0.896).Within the limits of this study, Class II restoration using flowable resin composite can be considered a promising option for the treatment of proximal caries in primary molars.

scholarly journals In vivo orthodontic retainer survival - a review

2015 ◽  
Vol 88 (3) ◽  
pp. 298-303 ◽  
Author(s):  
Anca Victoria Labunet ◽  
Mîndra Badea
Keyword(s):  
Stainless Steel ◽  
Survival Rate ◽  
Glass Fiber ◽  
Composite Resin ◽  
Steel Wire ◽  
In Vivo Studies ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced

AbstractBackground. Relapse following orthodontic treatment is a constant concern of orthodontists. Fixed retention is preferred especially for the lower arch by most orthodontists.Objectives:. This review focuses on in vivo studies. The main objective is to determine the survival rate of different types of retainer: glass-fiber reinforced composite resin, polyethylene or multistrand stainless steel wire bonded to each tooth from canine to canine in the mandibular arch. A second objective is to assess which of these types is less likely to cause additional problems and the third objective is to evaluate the factors that may influence retainer survival.Results and conclusions. There were 8 studies identified that matched the objectives stated. Curent in vivo studies on survival rate take little notice of the role of the material used for bonding of the fixed retainer. It is not possible to draw a conclusion on reliability of new types of retainers glass fiber reinforced composite resin or polyethylene compared to multistrand stainless steel wire. The multistrand wire remains the gold standard for fixed retention.Although it is a logical outcome that retainer survival is dependent on the application technique, there seems to be no research outcome proving that operator experience, moisture control are essential, nor does patient age or sex have statistically proven effects on survival rates.Adequate studies that involve such aspects should be performed.

A phase IIb study of ramucirumab in combination with TAS102 versus TAS102 monotherapy in metastatic, chemotherapy refractory colorectal cancer patients: The RAMTAS trial of the German AIO (KRK-0316).

2019 ◽  
Vol 37 (15_suppl) ◽  
pp. TPS3617-TPS3617 ◽  
Author(s):  
Stefan Kasper ◽  
Gerrit zur Hausen ◽  
Alexander Stein ◽  
Sebastian Stintzing ◽  
Andreas Berger ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Randomized Study ◽  
Progression Free Survival ◽  
Rank Test ◽  
Open Label ◽  
First Line Therapy ◽  
Kaplan Meier ◽  
Dismal Prognosis ◽  
Translational Research Program ◽  
Colorectal Cancer Patients

TPS3617 Background: Patients with metastatic colorectal cancer (mCRC) with progressive disease on/after or who are intolerant to fluoropyrimidines, oxaliplatin, irinotecan, anti-angiogenic and anti-EGFR therapies have limited therapeutic options and a dismal prognosis, with a median survival below 6 months. Recently, Trifluridin/Tipiracil (TAS102) significantly improved survival in patients with refractory mCRC and ramucirumab has been approved in combination with FOLFIRI for the treatment of patients with mCRC after prior FOLFOX/bevacizumab first line therapy. Previous studies on both components provide a strong rationale to conduct a randomized study evaluating the efficacy and safety of ramucirumab in combination with TAS102 in patients with refractory mCRC to improve efficacy and prevent resistance. Methods: This is an interventional, randomized, open label, multicenter, phase IIb study in patients with advanced mCRC. Eligible patients will be randomized 1:1 and receive either ramucirumab and TAS102 (ramucirumab 8 mg/kg on d1+15, q4w and TAS102 35 mg/m² on d1-5 and d8-12, q4w) or TAS102 alone. Primary endpoint is overall survival as assessed by the Kaplan-Meier method, assuming a 6 months survival probability of 70% with ramucirumab in combination with TAS102 and 58% with TAS102 alone. Treatment groups are compared using the log-rank test. A total of 144 patients will be enrolled at 30 sites (1-sided alpha 0.10, power 0.80). Main secondary endpoints are overall response rate, disease control rate, progression free survival and quality of life. In addition, a large comprehensive translational research program will be conducted to identify novel predictive and prognostic biomarkers. The study started in December 2018. By February 2019, a total of 3 patients have been enrolled. Clinical trial information: NCT03520946.

scholarly journals NEOADJUVANT CHEMORADIOTHERAPY AND SURGERY COMPARED WITH SURGERY ALONE IN SQUAMOUS CELL CARCINOMA OF THE ESOPHAGUS

2013 ◽  
Vol 50 (2) ◽  
pp. 101-106 ◽  
Author(s):  
Nelson Adami ANDREOLLO ◽  
Valdir TERCIOTI Jr. ◽  
Luiz Roberto LOPES ◽  
João de Souza COELHO-NETO
Keyword(s):  
Squamous Cell Carcinoma ◽  
Cell Carcinoma ◽  
Squamous Cell ◽  
Randomized Study ◽  
Neoadjuvant Chemoradiotherapy ◽  
Rank Test ◽  
Neoadjuvant Radiotherapy ◽  
Carcinoma Of The Esophagus ◽  
Significance Level ◽  
Kaplan Meier

Context Despite progress in recent years in methods of diagnosis and surgical treatment of esophageal cancer, there is still controversy about the benefits from neoadjuvant chemoradiotherapy. Objective To analise the survival of patients submitted to esophagectomy for squamous cell carcinoma of the esophagus with or without neoadjuvant chemoradiotherapy. Method A retrospective, non-randomized study conducted using the medical charts of patients operated for squamous cell carcinoma of the esophagus at the School of Medical Sciences, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil between 1979 and 2006. The Kaplan-Meier analysis was used to calculate survival curves and the log-rank test to compare data in each group. The significance level was settled as 5%. Results A total of 123 patients were evaluated in this study, divided into three groups: I - 26 (21.2%) patients submitted to esophagectomy alone; II - 81 (65.8%) patients submitted to neoadjuvant radiotherapy plus esophagectomy and III - 16 (13%) patients submitted to neoadjuvant chemoradiotherapy plus esophagectomy. A statistically significant survival was recorded between the groups (log rank = 6.007; P = 0.05), survival being greatest in the group submitted to neoadjuvant chemoradiotherapy, followed by the group submitted to neoadjuvant radiotherapy compared to the group submitted to esophagectomy alone as the initial treatment of choice. Conclusion Radiotherapy and chemotherapy neoadjuvants in patients with squamous cell carcinoma of the esophagus offers benefits and increases survival.

Glass Fiber Reinforced Composite Resin as an Intracanal Post –A Clinical Study

2008 ◽  
Vol 32 (3) ◽  
pp. 207-210 ◽  
Author(s):  
Priya Subramaniam ◽  
K. Girish Babu ◽  
Raju Sunny
Keyword(s):  
Stainless Steel ◽  
Glass Fiber ◽  
Composite Resin ◽  
Steel Wire ◽  
Stainless Steel Wire ◽  
Marginal Adaptation ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced

Restoration of primary incisors, which have been severely damaged by early childhood caries or trauma, is a difficult task for the pediatric dentist. With the introduction of new adhesive systems and restorative materials,alternative approaches for treating these teeth have been proposed. Materials: Ten healthy children aged between 3-4 years who had 28 grossly destructed primary maxillary incisors requiring intra canal retention were selected for the study. Following root canal treatment, either a Glass Fiber Reinforced Composite Resin (GFRCR everStick,, Finland) or an omega shaped stainless steel wire were placed as intracanal posts in these teeth. Flowable composite was used for cementation of posts and also to build up the coronal structure using celluloid strip crowns. Both types of intracanal posts were evaluated for retention and marginal adaptation at 1, 6 and 12 months. The data obtained was subjected to statistical analysis. Conclusion:GFRCR intracanal posts showed better retention and marginal adaptation than omega shaped stainless steel wire posts.

Preparation of Electron Transparent Metal-Matrix Composites

1968 ◽  
Vol 26 ◽  
pp. 334-335 ◽  
Author(s):  
M. R. Pinnel ◽  
A. Lawley
Keyword(s):  
Stainless Steel ◽  
Load Transfer ◽  
Volume Fraction ◽  
Steel Wire ◽  
Initial Step ◽  
Interfacial Region ◽  
Matrix Composites ◽  
Specific Test ◽  
The Matrix ◽  
The One

Numerous phenomenological descriptions of the mechanical behavior of composite materials have been developed. There is now an urgent need to study and interpret deformation behavior, load transfer, and strain distribution, in terms of micromechanisms at the atomic level. One approach is to characterize dislocation substructure resulting from specific test conditions by the various techniques of transmission electron microscopy. The present paper describes a technique for the preparation of electron transparent composites of aluminum-stainless steel, such that examination of the matrix-fiber (wire), or interfacial region is possible. Dislocation substructures are currently under examination following tensile, compressive, and creep loading. The technique complements and extends the one other study in this area by Hancock.The composite examined was hot-pressed (argon atmosphere) 99.99% aluminum reinforced with 15% volume fraction stainless steel wire (0.006″ dia.).Foils were prepared so that the stainless steel wires run longitudinally in the plane of the specimen i.e. the electron beam is perpendicular to the axes of the wires. The initial step involves cutting slices ∼0.040″ in thickness on a diamond slitting wheel.

Colorectal Liver Metastases - Does the Number of Lesions Determine the Sensibility of Resection?

Swiss Surgery ◽  
2000 ◽  
Vol 6 (1) ◽  
pp. 6-10
Author(s):  
Knoefel ◽  
Brunken ◽  
Neumann ◽  
Gundlach ◽  
Rogiers ◽  
...  
Keyword(s):  
Liver Metastases ◽  
Colorectal Liver Metastases ◽  
Rank Test ◽  
Log Rank Test ◽  
Kaplan Meier ◽  
Chirurgische Entfernung

Die komplette chirurgische Entfernung von Lebermetastasen bietet Patienten nach kolorektalem Karzinom die einzige kurative Chance. Es gibt jedoch eine, anscheinend unbegrenzte, Anzahl an Parametern, die die Prognose dieser Patienten bestimmen und damit den Sinn dieser Therapie vorhersagen können. Zu den am häufigsten diskutierten und am einfachsten zu bestimmenden Parametern gehört die Anzahl der Metastasen. Ziel dieser Studie war es daher die Wertigkeit dieses Parameters in der Literatur zu reflektieren und unsere eigenen Patientendaten zu evaluieren. Insgesamt konnte von 302 Patienten ein komplettes Follow-up erhoben werden. Die gebildeten Patientengruppen wurden mit Hilfe einer Kaplan Meier Analyse und konsekutivem log rank Test untersucht. Die Literatur wurde bis Dezember 1998 revidiert. Die Anzahl der Metastasen bestätigte sich als ein prognostisches Kriterium. Lagen drei oder mehr Metastasen vor, so war nicht nur die Wahrscheinlichkeit einer R0 Resektion deutlich geringer (17.8% versus 67.2%) sondern auch das Überleben der Patienten nach einer R0 Resektion tendenziell unwahrscheinlicher. Das 5-Jahres Überleben betrug bei > 2 Metastasen 9% bei > 2 Metastasen 36%. Das 10-Jahres Überleben beträgt bislang bei > 2 Metastasen 0% bei > 2 Metastasen 18% (p < 0.07). Die Anzahl der Metastasen spielt in der Prognose der Patienten mit kolorektalen Lebermetastasen eine Rolle. Selbst bei mehr als vier Metastasen ist jedoch gelegentlich eine R0 Resektion möglich. In diesen Fällen kann der Patient auch langfristig von einer Operation profitieren. Das wichtigere Kriterium einer onkologisch sinnvollen Resektabilität ist die Frage ob technisch und funktionell eine R0 Resektion durchführbar ist. Ist das der Fall, so sollte auch einem Patienten mit mehreren Metastasen die einzige kurative Chance einer Resektion nicht vorenthalten bleiben.

Evaluation of Mandibular Arch Width Changes following Fixed Retention in Post Orthodontic Patients - a Randomized Clinical Trial

2020 ◽  
Author(s):  
Nasreen Iqbal Nagani
Keyword(s):  
Stainless Steel ◽  
Steel Wire ◽  
P Value ◽  
Chi Square ◽  
Mandibular Arch ◽  
Arch Width ◽  
Orthodontic Patients ◽  
Mean Differences ◽  
One Year ◽  
The Stability

Background: Retention is an integral phase in which teeth are maintained in their newly adapted position for which retainers are inserted. Retainers are generally of two types: removable and fixed. Fixed retainers are indicated in the mandibular arch for an indefinite period specifically in the non-extraction cases. Changes in intercanine and intermolar widths are valuable parameters to evaluate the stability. The objectives of this study were to assess and compare the mandibular intercanine and intermolar width changes following orthodontic treatment after insertion of two types of fixed lingual retainers for one year. Methods: Total 54 subjects were recruited in which two types of fixed lingual retainers were inserted in the mandibular arch randomly. Intercanine and intermolar arch widths were measured by digital caliper of 0.01 mm accuracy. Data was analyzed by using Statistical Package of Social Sciences (SPSS V-21). Chi-square and independent t tests were used to compare baseline characteristics. Intercanine and intermolar widths were assessed and compared using independent t test, p-value ≤ 0.05 is considered as statistically significant. Results: Intercanine width increased from baseline to T4 in both retainers. When mean differences of intercanine width were compared between two retainers significant differences were observed at T1, T2, T3 and T4 with significant p-values (< 0.05) and increased intercanine width with multistranded stainless steel wire (MSW) retainers. Conclusion: Mandibular intercanine width increases significantly in post retention phase with multistranded stainless steel retainers. Thus, fiber reinforced composite retainers are more effective in preserving the arch width changes.

scholarly journals Cohort study of the overall survival of patients with pancreatic cancer in a hospital of specialties of Quito-Ecuador in the period 2007–2017

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Andrés Moreno Roca ◽  
Luciana Armijos Acurio ◽  
Ruth Jimbo Sotomayor ◽  
Carlos Céspedes Rivadeneira ◽  
Carlos Rosero Reyes ◽  
...  
Keyword(s):  
Pancreatic Cancer ◽  
Cohort Study ◽  
Survival Time ◽  
Univariate Analysis ◽  
Rank Test ◽  
Kaplan Meier ◽  
Significant Difference ◽  
Icd 10 ◽  
The Difference ◽  
Clinical Records

Abstract Objectives Pancreatic cancers in most patients in Ecuador are diagnosed at an advanced stage of the disease, which is associated with lower survival. To determine the characteristics and global survival of pancreatic cancer patients in a social security hospital in Ecuador between 2007 and 2017. Methods A retrospective cohort study and a survival analysis were performed using all the available data in the electronic clinical records of patients with a diagnosis of pancreatic cancer in a Hospital of Specialties of Quito-Ecuador between 2007 and 2017. The included patients were those coded according to the ICD 10 between C25.0 and C25.9. Our univariate analysis calculated frequencies, measures of central tendency and dispersion. Through the Kaplan-Meier method we estimated the median time of survival and analyzed the difference in survival time among the different categories of our included variables. These differences were shown through the log rank test. Results A total of 357 patients diagnosed with pancreatic cancer between 2007 and 2017 were included in the study. More than two-thirds (69.9%) of the patients were diagnosed in late stages of the disease. The median survival time for all patients was of 4 months (P25: 2, P75: 8). Conclusions The statistically significant difference of survival time between types of treatment is the most relevant finding in this study, when comparing to all other types of treatments.

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