Home Forums Posts BC Liner, Conclusions and Clinical Tips (Part 8 of 8)

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    • #4168
      Allen Ali Nasseh
      Keymaster

      In this final segment, Dr. Nasseh shares some thoughts and ideas for best use of BC Liner.
      [See the full post at: BC Liner, Conclusions and Clinical Tips (Part 8 of 8)]

    • #4364
      faymansouri
      Participant

      I was wondering you never mentioned anything about the usage of primer while you using etch and bonding. Does that mean it can go into dentinal tubes due to yo fluidity? Please clarify.

    • #4370
      Allen Ali Nasseh
      Keymaster

      @Feymansouri: You’re right. I wasn’t clear about that. In general, Etch/Prime/Bond with the Liner is one step. It’s included in the material. However, like all self etching materials, this combination is an average of the ideal properties of each of those steps. Therefore, while it does provide some etching and bonding on its own, in situations where enamel etching or bond strength is paramount (longer term applications) the use of conventional etching and bonding prior to placement is recommended for the highest material to dentin-enamel bond. Hope his clarifies. 🙂

    • #6540
      Jason Wu
      Participant

      Hi Dr. Nasseh,
      I’m assuming BC Liner is a sort of RMGI type of material. Do you treat it more like a resin material and only rely on the glass ionomer self setting portion for reduced shrinkage? I ask because if you place bonding prior to using a glass ionomer like material, then you don’t get the glass ionomer chemical bond to dentin properties as you’ve placed bond over the dentin already. If isolation is not a problem, would you prefer using normal composite for transcrestal defects like from external resorptive lesions? And if the lesion is deep enough to stay sub sulcular, would you prefer to use BC putty to repair the lesion instead of using BC liner?

    • #6541
      Allen Ali Nasseh
      Keymaster

      @Jason Wu: Yes, it’s basically a RMGI. And yes, if you want GIC bonding then no bonding agent is needed. It also self etching and self bonding. So you do get some resin bonding too. However, it’s not strong. So the application matters. If you want a very solid bond for most tensile strength then etch/bond as it will give you the maximum bond with bulk flow. But for most access fill applications it’s not needed; however you have to judge the quality of the dentin and it’s sometimes better to fresh up the surface with a bur after endo to avoid NaClO action on dentin throughout the procedure. Also, you have to place and make sure you wait at least 30 seconds before you attempt to light cure. Otherwise, premature light curing causes shrinkage! (so be careful with operatory and/or microscope light. Cheers!

    • #7242
      Jason Wu
      Participant

      Does it have more glass ionomer or more resin? I tried using it, but it doesn’t self set. I left it out for an hour and it still didn’t set so I’m assuming it’s more like a resin than a glass ionomer. Is that true or did I get a defective set? Thank you

      • #7243
        Allen Ali Nasseh
        Keymaster

        @Jason Wu: Like all dual cure resin ionomer cements expressed through a dual barrel syringe you have to make sure you bleed the syringe before you place the mixing tip on and then you have to express out the first drop of mixed material before you get to the proper mix. I’m sure you know what bleeding the syringe is but for anyone who doesn’t know it’s equal to expressing out a pea-size portion from both barrel to make sure you have material coming to the tip of the barrel and will get equal mix before securing the mixing tip in place. So, you have to express out and discard before you put the mixing tip and after you mix out of the mixing tip. BTW, this is not unique to this material but the proper protocol for all dual barrel syringe mixing tip initiated techniques since if you don’t do this you may get a lot of base to catalyst ratio and you won’t get a set.
        The full setting time of the material would be around 4 minutes at body temperature. I use BC liner every day on almost 100% of cases to replace the idea of using Cavit. I just fill the whole chamber with the blue BC Liner after every root canal and ask the restorative dentist to remove 2-3mm from the surface of the Blue liner and use the rest as base to bond their core prior to a crown. So, after the root canal, I fill the chamber to the cavosurface with the liner and wait 40 seconds for it to do its self etching and self bonding routine before zapping the surface with 3 seconds of curing light so the surface which will be in contact with saliva when I remove the rubber dam would set but the rest below would self set and therefore have less polymerization shrinkage (less with self cure than with light). Anyway. In a couple thousand cases I’ve done this way I am yet to hear back from a referring dentist that the material was not set. If I use it as a provisional between visits or when patients come back for recall before getting the tooth restored I always find it fully set too. So, my assumption is that you either didn’t get a thorough mix (unequal mix of base-catalyst) or you had a bad batch somehow. Talk to your rep and give him/her your syringe so they can find out if the problem was the syringe or just the mixing. Cheers! 🙂

      • #7246
        Jason Wu
        Participant

        Yeah I made sure to bleed the material and tried checking it twice with the syringe tip and once self mixing it. I’m going to assume I got a defective set then since it isn’t expired and doesn’t self set. I’ll try contacting Brasseler if I can get a replacement. Thank you!

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