You are a blessing to every dental student out there. You explain concepts in a simplified manner. Thank you for taking the time to make these amazing videos.
Thank you so much for making this vedio. I'm in love with your voice and the way you explained. And the content you've used is very much helpful as you've told all about the important things in each part. By the way tomorrow is my viva of this section and after watching this i already feel like i know so much. I am so thankful.
Thank u so much for explaining everything in such a simplified way.i really like your each and every video & the way u explain the things is just WOW :-)
Thanks sir 🙏 🌹 please share mora about dental materials.... I favor your videos more than others because your videos are so awesome and you are the best teacher.. 🌺💐
Hi,Dr.Rayan!!!THANK YOU SO MUCH FOR YOUR VIDEOS! Very clear explanation!Could you please explain differences between this youtube videos and your membership?How big differences in ammount of videos or how does it works?
You're very welcome! I'm glad you are enjoying the videos. All of my videos are free to watch here on RU-vid! The Patreon membership provides bonuses like PDFs for all of the slides in my videos and extra practice questions to help study for the board exams.
Thank you Dr. Ryan for this beautiful video series:) Quick question: I read in Dental decks that of all the Elastomeric impression materials, Polyethers are the one with "No Byproducts instead of Addition silicones with an explanation that the later has release of free radicals while the former undergoes Cationic polymerization? Could please help understand which choice to opt for?
Hallo Ryan,thank you for your efforts I wanted to ask you,is it possible to do a video on Periodontal Indexes (especially Periodontal screening Index)?
You're welcome! Unfortunately I am not familiar with the PSI/PSR system so I cannot confidently speak on it, but the good news is it's not covered on the board exam to my knowledge. At a glance it does appear the PSI screening tool applies many of the concepts we talked about in the first video on Periodontics like BOP and PPD but using a different probe and different measuring system. Instead of writing down every finding from six sites of every tooth, you quickly measure bleeding, calculus, and probing depth but only record the worst reading in each sextant of the mouth. The idea is to save some time, but the drawback is you have limited information to refer to back in the future. Hope that helps!
Thank you for this valuable lesson. I would like to ask you : are polysufide impression material intolerant and very sensitive to fluids present in the oral cavity? ( in this video it's mentioned as moisture tolerant). Thanks
Thank you for asking this question! Sorry if that was confusing! A good way to think about how moisture impacts impression materials is looking at polysulfide and polyether as opposites. Polysulfide rubber was the first “rubber” impression material used in dentistry, and was also the first really accurate impression material. It has better dimensional stability and tear strength than its predecessors (agar and alginate), but it still has problems around water because it is hydrophobic. This means that the tooth preparation has to be very dry when the impression is taken or else you will get voids in the material. If stored in a dry room for too long it will experience syneresis and distort. In hindsight I shouldn’t have used the phrase “water tolerant,” because that can be confusing! Polysulfide also has a long setting time, is very flexible so it can be removed easily, and has a uniquely bad odor. Polyether on the other hand is hydrophilic. This means it can be used with some saliva on the tooth preparation without experiencing the same voids (theoretically). Additionally in dry air, the material is actually very stable! But the main problem is storage in high humidity which can cause distortion problems through absorption, known as imbibition. Polyether also has a short setting time, is very stiff so you can break teeth off the casts during separation, and can produce an allergic reaction for some patients.
I have a question Ryan. You said that addition silicone (PVS) don't have by products, but I have seen that it has H2 hydrogen as a byproduct. I just want to make sure. Thank you so much, your videos are amazing!!
Yes, that's a great question. For the purpose of studying for the board exam/dental school, I would remember that PVS does not produce a volatile byproduct because this is why there are very few dimensional changes that occur during setting. Now, PVS can produce hydrogen gas (which is why you should wait 30+ minutes to pour them) but many PVS materials contain catalysts that absorb this hydrogen.
Hi Ryan: Thank you so much for this video. But I have a question, why electrosurgery is contraindicated for patients with pacemakers? I learned that the magnetic effect of the electrosurgical handpiece is insignificant.
It was historically contraindicated for concerns about electrical interference with the pacemaker. You’re right that electrosurgical interference was primarily an issue with earlier pacemaker models. Improvements to the newer models make them very resistant to outside electrical influence.
