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Medical Forum / General / Dentistry / April 2008drills-- air or electric micromotor?
I must confess; I'm actually using this for soft stone carving, for the finest details where a chisel would just be foolhardy. Hech, not all that different from bone really-- more brittle, and granular, but about the same hardness. So-- it strikes me that dental tools both must be held to higher standards, and are more ubiquitous, so I'm more likely to find a good deal on a used one besides. Do you prefer air or electric micromotor drills? I've got a shop-duty compressor w/ regulator, standard 1/4" fittings-- is this what a dental drill operates on, or at least, can it easily be made compatible? I don't care about dehydrated air of course, not going in cold-sensitive mouths, so long as the drill runs on a standard compressor for carving purposes? Intrigued by the fiber optics that seem to be in some air drills, might help lighting in the tight undercuts too; not sure what that would cost. I ask mostly because I've seen two holes on some of the drills; is one for intake and the other just left open for the air going out-- nothing requiring an exotic specialized compressor? Now on the subject of micromotors. I can pay $375 or maybe a bit less for a woodcarving setup by RAM, or I can spend $1000 on a new dental drill, or perhaps $250 for a new chinese ebay dental micromotor. I'd like your opinion on any of these options, but most important really-- is the micromotor better than the air drill? More torque, smoother, quieter, bearing quality (I'll be putting a fair bit of side load on the burrs) questions like that. thanks!! -Bernard Arnest Btw, I haven't seen the exact equivalent in dentistry (as compared to micromotors, where they can look *identical* between dental or woodworking brandings)-- but do you have any opinion on the turbocarver, foredom 350, powercarver, or powercrafter? They're all the same, I'm not asking for a brand comparison (just giving a list for the google search to find what I'm talking about). But how do you think a 350 or 400k rpm air tool compares to the 50k rpm dental air or electric tools? Have you used one? Higher rpms isn't necessarily good, risks of overheating and necessarily even smaller bits comes to mind; but I won't really know until I get my hands on one of each of the tools I'm comparing, and that won't happen unless I have the money to buy them all! OH-- one last option. Antique dental drills, not sure if they were even used beyond the '30s or '40s, with the three arms and the belt- driven handpiece. Thoughts? thanks! -Bernard The high speed handpieces (300+K) used in dentistry have very little torque, and would likely stall in your application. As Amatus pointed out, these need very clean, filtered, and dried air to operate without trashing the turbine in short order. A nice flex shaft Dremmel tool or equivalent would likely deliver all the torque that you need, and handle much like a dental low speed (20-50K). An electric 'laboratory' straight handpiece may be another alternative. Probably more expensive than the Dremmel. >Btw, I haven't seen the exact equivalent in dentistry (as compared to >micromotors, where they can look *identical* between dental or [quoted text clipped - 12 lines] >even used beyond the '30s or '40s, with the three arms and the belt- >driven handpiece. Thoughts? Often called a 'jack rabbit' or dental engine. If you overtorque one of these, the belt slips off of the pulleys and you have to re-string it. >thanks! >-Bernard On Mar 22, 1:31 am, New...@bix.nex wrote: > The high speed handpieces (300+K) used in dentistry have > very little torque, and would likely stall in your application. > As Amatus pointed out, these need very clean, filtered, > and dried air to operate without trashing the turbine in short order. I think he meant a pneumatic micromotor, not a high-speed airotor. But these would need clean air as well. Perhaps if he's lucky he can find a used dental compressor on ebay? Regards, George You get more torque with an electric motor, so I would probably go for an electric one. I never liked pneumatic micromotors. On the other hand, the electric will be much more expensive. Regards, George Air rotors need CLEAN filtered air. Much cleaner than your average shop A/C. > You get more torque with an electric motor, so I would probably go for > an electric one. I never liked pneumatic micromotors. On the other > hand, the electric will be much more expensive. > > Regards, > George An Air Conditioned shop ? What a concept ! Great idea ! >Air rotors need CLEAN filtered air. Much cleaner than your average shop >A/C. [quoted text clipped - 5 lines] >> Regards, >> George Intriguing questions, What type of stone are you carving ? Do you carve much bone ? Fiber optics are kewl and do add some cost. See my response to your other missive. >I must confess; I'm actually using this for soft stone carving, for >the finest details where a chisel would just be foolhardy. Hech, not [quoted text clipped - 16 lines] >for intake and the other just left open for the air going out-- >nothing requiring an exotic specialized compressor? There are 2, 3, 4 hole set ups, each requires the appropriate female connector. For fiber optics the set up is generally 5 or 7 and requires a specific coupler and a light/electrical source. The shop compressor is going to be problematic, and remember dental handpieces are run using a foot controller to control the air pressure.. You would likely need a mini-dental unit, but those are available. You can't just run these instruments 'wide open' all the time. >Now on the subject of micromotors. I can pay $375 or maybe a bit less >for a woodcarving setup by RAM, or I can spend $1000 on a new dental [quoted text clipped - 6 lines] >thanks!! >-Bernard Arnest the trick was the safe maschine was handy slow speed to avoid overheating. air was in the past wrong becouse some oil could get into water sytem to make contamination.. presently there are not oil compressors and safe water circulation inside dental chairs.. There is not big diffrenece between air and electric motors. Personnaly I think air motors are long working and there is less chance to failer .. Electronics is always risk :)) best regards kris-Polanowski DDS >I must confess; I'm actually using this for soft stone carving, for > the finest details where a chisel would just be foolhardy. Hech, not [quoted text clipped - 27 lines] > thanks!! > -Bernard Arnest |
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