Long-term stability of the heparin surface on PMMA-intraocular lenses - results of an in vitro study

1997 ◽  
Vol 94 (12) ◽  
pp. 920-924 ◽  
Author(s):  
Burkhard Dick ◽  
Kathrin Greiner ◽  
Gerd Magdowski ◽  
Norbert Pfeiffer
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Intraocular Lenses ◽  
Term Stability ◽  
Long Term Stability

Effect of undersizing on the long-term stability of the Exeter hip stem: A comparative in vitro study

2010 ◽  
Vol 25 (9) ◽  
pp. 899-908 ◽  
Author(s):  
Luca Cristofolini ◽  
Paolo Erani ◽  
Ewa Bialoblocka-Juszczyk ◽  
Hirotsugu Ohashi ◽  
Satoshi Iida ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Term Stability ◽  
Long Term Stability

In-Vitro Study of Bacterial Adherence to Different Types of Intraocular Lenses

2002 ◽  
Vol 28 (1) ◽  
pp. 95-99 ◽  
Author(s):  
Carole Burillon ◽  
Laurent Kodjikian ◽  
Gérard Pellon ◽  
Annie Martra ◽  
Jean Freney ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Bacterial Adherence ◽  
Vitro Study ◽  
Intraocular Lenses ◽  
Different Types

Effects of Cr(VI) long-term and low-dose action on mammalian antioxidant enzymes (an in vitro study)

2004 ◽  
Vol 98 (3) ◽  
pp. 490-496 ◽  
Author(s):  
Nino Asatiani ◽  
Nelly Sapojnikova ◽  
Marina Abuladze ◽  
Tamar Kartvelishvili ◽  
Nina Kulikova ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Low Dose ◽  
In Vitro Study ◽  
Vitro Study

Marginal, Internal Fit and Microleakage of Zirconia Infrastructures: An In-Vitro Study

2011 ◽  
Vol 36 (1) ◽  
pp. 72-79 ◽  
Author(s):  
L. Korkut ◽  
H. S. Cotert ◽  
H. Kurtulmus
Keyword(s):  
Clinical Relevance ◽  
In Vitro Study ◽  
Manufacturing Technology ◽  
Vitro Study ◽  
Internal Fit ◽  
Fitting Accuracy

Clinical Relevance Fitting accuracy and microleakage dominate prognostic covariates for the long-term durability of crown restorations. The fitting accuracy and microleakage potential of zirconia infrastructures might be influenced by manufacturing technology.

scholarly journals Long-term antibacterial properties of a nanostructured titanium alloy surface: An in vitro study

2022 ◽  
Vol 13 ◽  
pp. 100176
Author(s):  
Richard Bright ◽  
Daniel Fernandes ◽  
Jonathan Wood ◽  
Dennis Palms ◽  
Anouck Burzava ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Antibacterial Properties ◽  
In Vitro Study ◽  
Vitro Study ◽  
Alloy Surface ◽  
Nanostructured Titanium

scholarly journals Long-Term Stability of a RAFT-Modified Bulk-Fill Resin-Composite under Clinically Relevant versus ISO-Curing Conditions

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5350
Author(s):  
Niklas Graf ◽  
Nicoleta Ilie
Keyword(s):  
Fracture Mechanism ◽  
Resin Composite ◽  
Bending Test ◽  
Depth Sensing ◽  
Matrix Formulation ◽  
Curing Conditions ◽  
Term Stability ◽  
Long Term Stability

The addition of RAFT (reversible addition-fragmentation chain transfer) agents to the matrix formulation of a bulk-fill resin composite can significantly decrease the required curing time down to a minimum of 3 s. Evaluating the long term-stability of this resin composite in relation to varied curing conditions in an in-vitro environment was this study’s goal. Specimens were produced according to either an ISO or one of two clinical curing protocols and underwent a maximum of three successive aging procedures. After each one of the aging procedures, 30 specimens for each curing condition were extracted for a three-point bending test. Fragments were then stereo-microscopically characterized according to their fracture mechanism. Weibull analysis was used to quantify the reliability of each aging and curing combination. Selected fragments (n = 12) underwent further testing via depth-sensing indentation. Mechanical values for either standardized or clinical curing were mostly comparable. However, changes in fracture mechanism and Weibull modulus were observed after each aging procedure. The final procedure exposed significant differences in the mechanical values due to curing conditions. Curing conditions with increased radiant exposure seemingly result in a higher crosslink in the polymer-matrix, thus increasing resistance to aging. Yet, the clinical curing conditions still resulted in acceptable mechanical values, proving the effectiveness of RAFT-polymerization.

Long- and short-term in vitro D-dimer stability measured with INNOVANCE D-Dimer

2010 ◽  
Vol 103 (02) ◽  
pp. 461-465 ◽  
Author(s):  
Martina Böhm-Weigert ◽  
Thomas Wissel ◽  
Heidrun Muth ◽  
Bettina Kemkes-Matthes ◽  
Dirk Peetz
Keyword(s):  
Frozen Storage ◽  
Percentage Change ◽  
Short Term ◽  
Term Stability ◽  
Long Term Stability ◽  
Repeated Freezing ◽  
The Mean ◽  
D Dimer

Summary In vitro D-dimer stability in plasma is widely assumed, but has not yet been documented by systematic studies using samples covering a wide range of D-dimer. We investigated the short- and long-term stability of D-dimer in clinical citrated plasma samples with normal and pathological levels. The short-term stability was analysed by measuring D-dimer fresh, after storage of plasma for 4 hours at room temperature (RT) and after an additional 24 h storage at +2 to +8°C (n=40). Long-term stability samples (n=40) were measured fresh and after storage for 19, 25 and 36 months at ≤-60°C. The effect of repeated freezing was analysed by measuring samples (n=50) fresh and after four consecutive freeze-thaw cycles. D-dimer was measured on the BCS System using the INNOVANCE D-Dimer assay (Siemens Healthcare Diagnostics Products GmbH, Marburg, Germany). D-dimer values at baseline ranged from 0.23–22.2 mg/l FEU. The mean percentage change after storage for 4 hours at RT and additional 24 hours at +2 to +8°C was +3.8% and +2.7%, respectively. The mean percentage change after frozen storage for 19, 25 and 36 months at ≤-60°C was –11.7%, –4.8% and –9.3%, respectively. The small decrease of D-dimer values after frozen storage was not time-dependent. Repeated freezing did not significantly alter D-dimer values (mean change ≤5%). The data demonstrate stability of D-dimer in plasma prior to freezing for up to 4 hours at RT and for up to 24 hours at +2 to +8°C as well as in plasma stored for up to three years at ≤-60°C.

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