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  • Re replacing an amalgam mod...
    Is it better to drill the restoration into sections and then push it out with a condenser etc..
    or to drill it all away like a normal cavity preparation..

    I would probably go with the first option , just wanted to see what others would do in this situation?




  • EoghanIRL wrote: »
    Re replacing an amalgam mod...
    Is it better to drill the restoration into sections and then push it out with a condenser etc..
    or to drill it all away like a normal cavity preparation..

    I would probably go with the first option , just wanted to see what others would do in this situation?

    Best advice I could give for this one is to wear your glasses!




  • When removing amalgam, it is best to reduce aerosol by touching the amalgam the minimum amount with the bur.  The shortest cut that will eliminate retention is what should be done.  I'm not aware of any studies that show whether cutting around the circumference of the restoration or sectioning it are the most effective.  I was taught in dental school to go around the outside and then pop the filling out.  This does not always work and sometimes section is required.




  • I found that a mixture of sectioning it and drilling along the amalgam tooth structure interface was required to remove it in the end.
    Sectioning it by cutting a cross shape in the restoration wasn't enough to pop it out , but popped out almost immediately once cutting around circumference.




  • Drill around the margins to release the undercuts, usually the box and bulk fly out. Carbides are usually more efficient than diamonds because the dont "clog up". The question is....is there a problem with the aerosol?


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  • The list of drugs which cause xerostomia is vast to say the least... Obviously some drugs are classically associated with xerostomia but with some drugs it would make you think what the actual incidence of occurrence is..
    For instance some diuretics give xerostomia as a side effect but then after getting a lecture from a physician who prescribes diuretics they said they have never come across this side effect...

    Do you see drug induced xerostomia often in practice and is it usually confined to a small number of typical drugs?




  • In the US polypharmacy is a much bigger problem than in Ireland. A recent pharmacology lecturer revealed that of the top 200 prescribed drugs in the US, 2/3rds can cause or contribute to xerostomia. I am quite regularly seeing patients with signs and symptoms of dry mouth and often the only possibility is pharmacologically induced xerostomia. Once you know what to look out for, you'll start seeing them more often. Doctors might not see it because they won't be watching for it and it also depends on wheter the pt is subjectively or objectively dry.




  • I see a good bit of dry mouth. Usually poly-pharmacy induced. Often psychiatric meds. Next most common cause is age related. There is also the fact that the quality of the saliva can be effected with an abundance of serious and a lack of mucous saliva. The patients mouth is subjectively not dry but all the good protective stuff is not there....frothy saliva syndrome.




  • If a patient asks you not to include something they told you in their medical history , does this mean that you have to not make note of it even if it was an infectious disease?




  • If a patient asks you not to include something they told you in their medical history , does this mean that you have to not make note of it even if it was an infectious disease?
    I've had the same scenario arise & asked my indemnity organisation what their view was. Couldn't get a concrete response.
    Theoretically, you're meant to treat *every* patient as though they have an infectious disease, so someone disclosing their diagnosis shouldn't make a difference in terms of cross infection control. However, it can impact on their treatment in other ways (meds, xerostomia, mood/behaviour, attendance, drug interactions, dietary habits, ect).
    I would say to respect their wishes& not document it, as requested. But to get consent to reference something very very vague like "discussed with patient& requested no written record" on the chart (this could cover anything from adoption to depression to cancer, so wouldn't be betraying the pts confidence to anyone reading the notes but would still be a reminder to you the practitioner)
    Also to reassure the patient that their medical history is completely confidential & won't be disclosed to any 3rd parties.
    Tbh, particularly in the case of HIV, I'd be far more worried about the **undiagnosed** patients walking around, clueless as to their condition,& without treatment- highly infectious.


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  • Hi dianthus, thanks for replying.

    In the dental council code of practice it refers to in extreme circumstances protecting the public interest.

    However with standard precautions and needle stick injury protocol it's hard to tell how much of a risk it poses.
    Definitely contentious that's for sure!

    What if you were working in a practice with multiple dentists across different specialities. Would it be appropriate to warn your colleagues of the infectious status of the patient if they were to treat them.

    I think that the infectious status of the patient doesn't meet the criteria for protecting public interest. I feel protecting the public interest refers to something more serious in nature such as a child being kidnapped on your premise or child abuse etc
    So I am leaning towards respecting the patients wishes and not breaching confidentiality.

    Is this a grey area or is it black and white and I'm not seeing the answer?




  • Knowing the patients status should not make any difference to the public interest.
    We are trained to treat every single patient as though they carry an infectious disease.
    Equally, we are not allowed refuse to treat a patient because they have an infectious disease- it's considered discrimination.
    Needlestick injuries have a standard set procedure & any reasonable& decent patient would disclose their status if asked after such an incident.




  • Preventive resin restorations or just placing a fissure sealant over a composite after placing, yes or no?

    Some supervisors push yes some no...Have heard divided opinions on this

    I dont really see the point in placing a fissure sealant over a composite if you have got a good hermetic seal anyway?

    Maybe if patient had a filling and a deep fissure as well but I don't really see the point otherwise.




  • Preventive resin restorations or just placing a fissure sealant over a composite after placing, yes or no?

    Some supervisors push yes some no...Have heard divided opinions on this

    I dont really see the point in placing a fissure sealant over a composite if you have got a good hermetic seal anyway?

    Maybe if patient had a filling and a deep fissure as well but I don't really see the point otherwise.

    If a supervisor is teaching students to place a fs over a composite they should be students themselves. I'm shocked.




  • I don't understand the reasoning behind it myself if I'm being honest.




  • The thinking is that the cavity is so small there is no ability to control the C factor shrinkage, the layer of sealant (unfilled/lightly filled resin basically) flows into the shrinkage gaps at the margins and gives a better seal in a smaller bulk. As there was no extension for prevention either the sealant fills the adjacent fissures.

    I do it to big composites when I dont obliterate the fissure, you can use a bit of bond to do it also these days with all the single bottle stuff. Its the same idea as using flowable in the box area.




  • When you are working unassisted and have a mirror in one hand and a handpiece in other how do you stop the patient from drowning with the water spray? Saliva ejector very limited water control I find.




  • Ditch the mirror and use the high volume for retraction, move the patients head so you have direct vision. There is a real knack to doing it, but I find it sometimes easier on the left to hold the suction yourself (right handed operator). Patient positioning in the chair and getting them to tilt and move their heads is essential.

    Saliva ejectors are of no use.




  • Removing a cusp during a filling.

    When is it definitely the right decision?

    I had a restoration where I followed ADJ laterally until I met enamel and then followed it downwards a bit. The cusp was quite undermined yet I still left it which got me thinking how would I have known to remove it completely...




  • You won't know for certain, you just have to make a call on it based on knowledge and intuition. There are so many variables such as strength of dentine/enamel, occlusion, diet etc. If you think it is going to break easily, either remove it or warn the patient. I'm more likely to retain thin cusps with composite fillings than I am with amalgam due to the bond, but every dentist will tell you even strong cusps break occasionally, and weak ones can be there for 20+ years.


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  • I always give the weak portion a good solid few taps with the flat end of a mirror along its weak axis, if its really weak it will break right off (warn patient your going to do this to avoid the "you broke my tooth" conversation.). If it survives the test then fill around it. As Davo said apart from that.




  • Use articulating paper to check the occlusion pre-op, not just post-op.
    Also, sometimes you can do an "overlay" type restoration, versus removing the entire wall.




  • Was taking to someone who was working with a dentist and they told me that for fillings they would clear ADJ , leave base , place dycal and then use RMGIC as definite restoration.

    Is this common?
    Any RMGICs I placed I was always made restore them with composite before tx plan complete. I know RMGIC doesn't have as good long term performance...




  • RMGIC tend to wear quite a lot on occlusal surfaces and they are a tad soluble. I wouldn't consider them definitive restorations on occlusal surfaces, Its a fine material for sandwich technique, Class 5 restorations etc.....having said that I have worked with a dentist who did this and said she would just cover it with composite later if it wore out. They all looked like a bag of crap to me but she swore by it. I always think the easy option is rarely the best.




  • If you were in practice and had a patient who needed supra gingival scale but was sensitive +++ would you give LA to all quadrants in one visit? Some patients experience a lot of sensitivity with the ultra sonic but at the same time it probably isn't a nice experience to have 4 quadrants numbed either.
    Two visits needed?




  • It really depends on the extent of cleaning required and the patient. Usually the most sensitive areas are the lower anteriors and upper premolars/6's. Three cartridges will usually do the trick, use articaine so that a small amount will numb sufficiently for cleaning. You will often find that the time taken to numb the patient is offset by the shorter time taken to scale teeth in comfort. Also, we charge a higher fee for cleaning with LA.




  • Removed a composite filling and found a pulp exposure(small,no bleeding). This was before I removed any caries, just restoration removal.
    Checked radiograph and filling didn't seem close to pulp. I know secondary caries and pulp is underestimated on radiograph but is this unusual?

    Edit: there was a really bad smell coming from the composite when I removed it but not sure is this normal with certain brands?




  • Small previous exposure probably killed the pulp and the smell is necrosis leaching into the restoration, hence no bleeding. You can hit a pulp horn without an extensive restoration. Yeah its very common. Goes to show, if you expose recommend endo. Exposure is a fact of the job, its nothing to feel bad about, unless your being careless.




  • A lot of people are mentioning pinhole surgery for recession defects. When I researched a Dr.Chao keeps coming up,seems a bit odd.
    Does anyone know is this a legitimate procedure??


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  • A lot of people are mentioning pinhole surgery for recession defects. When I researched a Dr.Chao keeps coming up,seems a bit odd.
    Does anyone know is this a legitimate procedure??

    No I looked into it and it seems legit. Its just a tunneling technique that he has developed special protocol and instruments for. Like all recession coverage it really depends on the defect, his own research shows about a 50% success rate.


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