Dental materials FOCUS

yeah hi Venus and now I'm here to explain you very important things related to the dental materials such it so we'll be dealing some tables which are very very important in examination point of view as this video will be there until you give the exam on our website so no need to write notes but people who are very interested to write their own note says can proceed okay the first and foremost thing is about the composition and the individual ingredient function of agar and Antonette okay so if you go very deep into this the main component that is present in the agar is water okay water occupies the major percent is and it is also called as a reaction medium okay and it is a balanced one okay the main component the major component is water if water is not there in the options the next major component is again so agar stands second in the composition of other that is 13 to 17 percentage and the most commonly asked question what is the function it acts as brush shape structure in Agra okay the next goes is the strength for agar you know the dagger is the more flexible the strength of other is basically due to borate and it is its person to the 0.2 to 0.5% s and the gypsum hardener that is added to the agar is the sulfate its percent is this 1 to 2 and the Fiddler's are the maxis that is 0.5 to 1 percent s and the last one is the gel that is added which is 0.3 to 0.5 percentage okay so all these numbers are very important the values are important and the functions are important okay so if they're asking a question on the composition the area will be from this so next course is the composition of alginate so the major composure percentage will be occupied or the ingredient is nigh domitius earth that is 60% s and the next ask question is they can ask you like the major component is fillers how much how much person days is fulness that is 60 plus four sixty four okay both this gene set as well as this diatomaceous earth both acts as a filler so topped by 64% this regular last question is the major component in the composition of agar are the major component in the composition of alginate is the most commonly asked question okay so next question what I have regularly seen that is 2019 and 18 need question that is the reactor the reactor in our Jeanette is calcium sulfate that of the best 16% is and the gypsum hardener hi can you get they have we have a different gypsum hartnett we have a different gypsum hardener in the agar and we have a different gypsum hardener in the case of alginate so don't get confused and this is the most common area where they allow to ask because we regularly get confused in this er that is potassium titanium fluoride is again a most commonly asked question ok so again this is an important area of neat and Ames okay the retarder in the case of alginate is sodium phosphate okay so please do learn this rate this practices and it's an important area of the function the major component is the first most commonly asked question and the second most commonly asked question is a function of individual component and the third most commonly asked question is the composition person dis hope you're clear and we are going to the next level okay so this table in elastomeric impression material sis is something like a godfather okay it's the most important thing and the paper sector cannot leave this and go to the next level okay so if if there is a question of course there will be a question from elastomeric impression materials in any sort of exam whether it is going to be a pga or ames or neat or chip mer you will have a question and the first choice to pick a question is from this area okay so before going into this okay make sure that the composition of all these four okay the four are important the composition similar to the agar alginate composition you have to learn about the composition the components that are present in this the activators that represent in this and everything that is required in the composition because we have seen multiple questions on this area of course we are going to discuss that part on the group but make sure that this classification and this compositions are very very important okay so the next one is before going deep into this table because you need to play with this table from all the directions okay the first thing that you have to make a note is about the sequence the sequence okay sequence based questions are nowadays common in the aims there will be at least two sequence based question in 200 of 200 marks of aims so this is an area where they can pick sequence based question of course if you open your basic mcq books and solve impression materials you will find many questions on the strength properties working times and XYZ related to this table okay the first thing that you have to make a note is about the sequence that is the first one is in the table is sulfate that is poly sulphide the second one is condensation silicon the third one is addition silicon and the fourth one is the poly ether okay so you need to make a note about the sequence and then you need to work on this okay the first one that we are going to deal is the Working Time okay so working time they have given question the working time of poly sulphide is the question that is most commonly repeated that is four to seven minutes and rest all are on a range that is 2 to 4 this is 4 to 7 highest and rest all are in a range of 2 to 4 you can see okay so they can ask you which other falling has highest working time the answer is poly sulphide the next goes to the second parameter that is setting time the setting time also almost the poly sulphide stands first with 7 to 10 minutes and this is a question that is already given in the examination and the rest all they have arranged they say they are have a range that range is somewhere around 4 to 8 okay no need to remember all those values but make a note like this is compared to this this compared to this is a question that they can logically ask you so high for working time inserting time the poly sulphide which stands first the next one is tear strength the date strength is highest again for the poly sulphide okay and the percentage contraction at 24 hours again polysulfides stands first okay so these are important where polysulfides stands first and the comparison and the order are important I'm focusing more on the questions which are already asked are questions which can be given okay so you try to cover everything but make sure you don't miss what I am stressing wrong next one I hope you know the contact angle okay the concept of contact angle to the wettability so the contact angle as the contact angle increases the wettability decreases as the variability decreases the contact angle increases so so bad so impression material having low contact angle are water-loving impression materials having high contact angle or water phobic hydrophobic hydrophilic is a regularly asked question it is just based upon the values of contact angle so if you go deep into this okay the least contact angle is for the poly ether means it is more water-loving which are the following is hydrophilic or which of the following is comparatively a water-loving material then you can go for poly ether as an answer and if you see the valley's that is eighty to ninety eight degrees and you have to Alice for addition silicon that is ninety eight and 53 okay hope you are clear with this so we go into the next level that is hydrogen gas release okay hydrogen gas released yes it is s for addition silicon where it is no the hydrogen gas is released by the addition silicon very good next one next course is otto mixing automatic mixing systems are available for the last two that is addition silicon and poly ether custom tray can be used for poly sulfide but not for the rest next one unpleasant order is again present in the poly sulfide multiple casts with a single impression can be done with addition silicon and can be done with the poly ether stiffness okay okay the value one stands the topper okay so the topper of the batch is the poly ether which it stands first okay the next goes they share this values okay the last one is this okay I hope you're very clear with this and next course is the destruction on removal value one indicates the greatest and value 4 indicates the least so value one is this two three and four these are the most commonly asked sequence based questions okay so make a note so please do learn everything whatever that is required from this table and just try to practice this once or twice whenever you have time so that's going to increase your capability to go with the right answer so next one is the guidelines or the disinfection protocols for the impression materials okay so if you go very deep into this there are a few questions which are asked from this area but make make a note okay so the first one is how do you handle this alternate okay so alginate uses only disinfectant for a shorter duration of time that is less than 10 minutes and the disinfectants that are required for this are chlorine fluoride or chlorine components and I dispose and the comments that are added here are the short-term rotor 'old head has been shown to be acceptable but the time is inadequate for its disinfection means glutaraldehyde has to be used for a longer duration of time for its effect to be the at the best okay but here in this condition you are not exposing for more than 10 minutes but even if you are if you are doing this minutes for clitoral hide that disinfection levels will be very very nice okay the next course the next important area is poly ether okay and even in the poly ethyl so the situation is for a short duration of exposure and the material that is used is almost the same and when you go with jet boy in pression paste either you have to do and I mean the preferred technique they can ask that preferred technique is immersion or you can spray you can spray the disinfectant solution on the bite registration and the material that is used is glutaraldehyde and ida force okay so please do add and note about this table this is not that important but it looks they can it look it looks like they can pick some questions and they can trap you okay so this is again an important area not a number based area but it's very important so the next course is the properties okay the properties of the gypsum products basically the types and their names are very very important I hope you are very good at this so I will be focusing more on the numbers that are regularly asked in this area first of all is water powder ratio so as you move from type 1 to type 5 the water power by powder ratio it decreases okay they can ask you individual values also that is already they have given a question on this that is 0.5 to 0.75 is a water by powder ratio for impression for impression plaster and 0.18 to 0.2 to is in a water by powder ratio for the dental stone which is high strength and high expansion and the next one is setting time the setting time is least for the type 1 and it is the same for almost all that is from type 2 to type 5 it is same that is 12 plus or minus 4 minutes whereas for the type 1 it is 4 plus or minus 1 minute okay the next course is the expansion the setting expansion they talk both about the minimum function the maximum expansion that is to hover expansion and specifically you need to focus on this area in the minimum expansion because the minimum expansion is 0 here 0 here 0 here 0 here so the only material which has a minimum expansion in the setting expansion values is the type for dental stone high strength and high expansion which has a minimum okay because it the word already says it is highly expansion so the minimum expansion is only for the high expansion dental stone that is 0.10 and of course you need to focus on these valleys the maximum expansion is 0.15 for type 10.30 for type 2 0 point 2 0 for type 3 0.10 for type 4 and 0.30 for type 5 okay so they can ask you which are the following setting expansion will be a maximum value or the minimum value so basing upon that you need to pick the option and last but not the least is the compressive strength okay the values it increases from type 1 to type file so they can ask the values and they can ask you to arrange them in the sequence so make a note numbers are very very important in general materials but you need to remember numbers the revision is important for to do a proper revision time management is very very important for an intern or even if it is very repeated okay so finally I want to conclude I'm very we are very happy the team of MDS concur is very happy that we made our student has made all India 4th rank in the recent aims result and we are very happy to share this so the suggestion from my said is to make such great things ok for for a great things to happen with us or in our life we need consistency ok we need a hard work oriented a little bit smartness is added we need such preparations but what what I regularly see in the most of online students is online students will not be monitored by the mentor even if you go in a wrong direction the mentor will not know that you are going in a wrong direction okay so you need to come out and talk with the mentor that sir I feel like I'm my preparation is not up to the mark in the last two or three days my preparation is deviated from the original path in the last one week or the last one month then the mentor can help you out so dedication is very very important and the consistency is utmost important to be successful in life not only in an entrance but in any part of your life both the dedication as well as the consistency within a time are very very important factors to be successful so please take such people these people into consideration or an inspiration and start working towards your goals okay thank you I'll stay positive this is dr. streak on from team MDS conquer okay now learning with MDS conquer signing off