Tech Corner
|
Shear bond strength of one-step self-etch adhesives to enamel: effect of acid pretreatment |
|
|
|
Poggio, C., Scribante, A., Della Zoppa, F., Colombo, M., Beltrami, R. and Chiesa, M. (2013), Shear bond strength of one-step self-etch adhesives to enamel: effect of acid pretreatment. Dental Traumatology. doi: 10.1111/edt.12027 AbstractAimThe purposes of this study were to evaluate the effect of surface pretreatment with phosphoric acid on the enamel bond strength of four-one-step self-etch adhesives with different pH values. Material and methodsOne hundred bovine permanent mandibular incisors were used. The materials used in this study included four-one-step self-etch adhesives with different pH values: Adper™ Easy Bond Self-Etch Adhesive (ph = 0,8-1), Futurabond NR (ph = 1,4), G-aenial Bond (ph = 1,5), Clearfil3S Bond (ph = 2,7). One two-step self-etch adhesive (Clearfil SE Bond/ph = 0,8-1) was used as control. The teeth were assigned into two subgroups according to bonding procedure. In the first subgroup (n = 50), no pretreatment agent was applied. In the second subgroup (n = 50), etching was performed using 37% phosphoric acid for 30 s. After adhesive systems application, a nanohybrid composite resin was inserted into the enamel surface. The specimens were placed in a universal testing machine (Model 3343, Instron Corp., Canton, Mass., USA). After the testing procedure, the fractured surfaces were examined with an optical microscope at a magnification of 10× to determine failure modes. The adhesive remnant index (ARI) was used to assess the amount of adhesive left on the enamel surface. ResultsDescriptive statistics of the shear bond strength and frequency distribution of ARI scores were calculated. ConclusionsEnamel pretreatment with phosphoric acid significantly increased bond strength values of all the adhesives tested. No significant differences in bond strength were detected among the four different one-step self-etch adhesives with different pH. Two-step self-etch adhesive showed the highest bond strength.
|
|
|
CAO Gadgets Help You Track Your Stuff |
|
|
|
|
We all have limitations with our memories. It seems that the faster our lives move, that the more information we are forced to process, that the more help we need remembering things. It's a simple matter of storage. The mind is like a bucket and the bucket has a limited capacity. If you begin to fill it with water, at some point in becomes full and as you add more water the excess begins to spill over the sides and is lost. It's pretty much the same with our brains & information. The more you try and squeeze into it, the more is squeezed out & lost. Because of that, many people are looking for car keys, phones, gadgets, pets, you name it. To help with all the clutter of info in our lives, the CAO group is creating wireless sensor tags that can monitor lots of different things in your life within lots of different parameters. These sensors can be attached to lots of different items and measure things like movement, temp, and angulation. When these parameters change, to settings that you indicate, the devices contact you via your Android device or iOS device. The parameters can be completely set by the user. The little devices are only $15 each so cost isn't really an issue, which is always nice. I could see these becoming fairly commonplace and handy. 
|
|
The most special thing about Windows 8 Start Screen is that you can pin almost anything, from files and folders to applications and websites on it. Windows 7 is not bad either – you can easily pin apps, folders, websites and other items to the taskbar. Similarly, you can hang any file, folder or executable on the Start Menu.
Today we will see a unique trick. We will talk about pinning items to the explorer window, especially the Computer screen which generally holds only the drive icons as shown in the image below. The advantage here is that a lot of users tend to navigate to this screen when they need to access frequently used folders. They like to start from the C: drive and over a period of time it becomes a habit that cannot be changed easily. So why not pin the most used folders right there to make things easier.
|
|
|
Comparison of caries detection methods using varying numbers of intra-oral digital photographs... |
|
|
|
I use photography as part of every new patient exam and believe it is an excellent method for detecting caries. MJ
BMC Oral Health 2013, 13:6 doi:10.1186/1472-6831-13-
BackgroundThis was a method comparison study. The aim of study was to compare caries information obtained from a full mouth visual examination using the method developed by the British Association for the Study of Community Dentistry (BASCD) for epidemiological surveys with caries data obtained from eight, six and four intra-oral digital photographs of index teeth in two groups of children aged 5 years and 10/11 years. MethodsFive trained and calibrated examiners visually examined the whole mouth of 240 5-year-olds and 250 10-/11-year-olds using the BASCD method. The children also had intra-oral digital photographs taken of index teeth. The same 5 examiners assessed the intra-oral digital photographs (in groups of 8, 6 and 4 intra-oral photographs) for caries using the BASCD criteria; dmft/DMFT were used to compute Weighted Kappa Statistic as a measure of intra-examiner reliability and intra-class correlation coefficients as a measure of inter-examiner reliability for each method. A method comparison analysis was performed to determine the 95% limits of agreement for all five examiners, comparing the visual examination method with the photographic assessment method using 8, 6 and 4 intra-oral photographs. ResultsThe intra-rater reliability for the visual examinations ranged from 0.81 to 0.94 in the 5-year-olds and 0.90 to 0.97 in the 10-/11-year-olds. Those for the photographic assessments in the 5-year-olds were for 8 intra-oral photographs, 0.86 to 0.94, for 6 intra-oral photographs, 0.85 to 0.98 and for 4 intra-oral photographs, 0.80 to 0.96; for the 10-/11-year-olds were for 8 intra-oral photographs 0.84 to 1.00, for 6 intra-oral photographs 0.82 to 1.00 and for 4 intra-oral photographs 0.72 to 0.98. The 95% limits of agreement were -1.997 to 1.967, -2.375 to 2.735 and -2.250 to 2.921 respectively for the 5-year-olds and -2.614 to 2.027, -2.179 to 3.887 and -2.594 to 2.163 respectively for the 10-/11-year-olds. ConclusionsThe photographic assessment method, particularly assessment of 8 intra-oral digital photographs is comparable to the visual examination method in the primary dentition. With the additional benefits of archiving, remote scoring, allowing multiple scorers to score images and enabling longitudinal analysis, the photographic assessment method may be used as an alternative caries detection method in the primary dentition in situations where the visual examination method may not be applicable such as when examiner blinding is required and in practice based randomised controlled trials (RCTs). 
|
|
|
Comparison of caries detection methods using varying numbers of intra-oral digital photographs... |
|
|
|
I use photography as part of every new patient exam and believe it is an excellent method for detecting caries. MJ
BMC Oral Health 2013, 13:6 doi:10.1186/1472-6831-13-
BackgroundThis was a method comparison study. The aim of study was to compare caries information obtained from a full mouth visual examination using the method developed by the British Association for the Study of Community Dentistry (BASCD) for epidemiological surveys with caries data obtained from eight, six and four intra-oral digital photographs of index teeth in two groups of children aged 5 years and 10/11 years. MethodsFive trained and calibrated examiners visually examined the whole mouth of 240 5-year-olds and 250 10-/11-year-olds using the BASCD method. The children also had intra-oral digital photographs taken of index teeth. The same 5 examiners assessed the intra-oral digital photographs (in groups of 8, 6 and 4 intra-oral photographs) for caries using the BASCD criteria; dmft/DMFT were used to compute Weighted Kappa Statistic as a measure of intra-examiner reliability and intra-class correlation coefficients as a measure of inter-examiner reliability for each method. A method comparison analysis was performed to determine the 95% limits of agreement for all five examiners, comparing the visual examination method with the photographic assessment method using 8, 6 and 4 intra-oral photographs. ResultsThe intra-rater reliability for the visual examinations ranged from 0.81 to 0.94 in the 5-year-olds and 0.90 to 0.97 in the 10-/11-year-olds. Those for the photographic assessments in the 5-year-olds were for 8 intra-oral photographs, 0.86 to 0.94, for 6 intra-oral photographs, 0.85 to 0.98 and for 4 intra-oral photographs, 0.80 to 0.96; for the 10-/11-year-olds were for 8 intra-oral photographs 0.84 to 1.00, for 6 intra-oral photographs 0.82 to 1.00 and for 4 intra-oral photographs 0.72 to 0.98. The 95% limits of agreement were -1.997 to 1.967, -2.375 to 2.735 and -2.250 to 2.921 respectively for the 5-year-olds and -2.614 to 2.027, -2.179 to 3.887 and -2.594 to 2.163 respectively for the 10-/11-year-olds. ConclusionsThe photographic assessment method, particularly assessment of 8 intra-oral digital photographs is comparable to the visual examination method in the primary dentition. With the additional benefits of archiving, remote scoring, allowing multiple scorers to score images and enabling longitudinal analysis, the photographic assessment method may be used as an alternative caries detection method in the primary dentition in situations where the visual examination method may not be applicable such as when examiner blinding is required and in practice based randomised controlled trials (RCTs).
|
|
| | << Start < Prev 1 2 3 4 5 6 7 8 9 10 Next > End >>
| | Results 19 - 27 of 1338 |
|
