Really sorry you feel so stressed Mrs Morton another NHS dentist here all be it in Scotlan please feel free to pm
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For those questioning Mrs m she has just spent ageof her own time given really detailed answers to common dental problems it can be found in health section titled" dental chronicles" you will find from there she is caring, no one should get injured at work whether they are a dentist plumber nurse etc.
I have injured my shoulders at work treating patient with scoliosis it took about an hour obviously tjis patient could not lie back, but I was off three days afterwards resulting in about 60 other patients having their appointments rescheduled,
Ultimately me making sure I work in correct position ensures maximum number of patients get good treatment, however there is no excuse for rudeness of dentist to OP. When dentists worked sitting up molar root treatment was unheard of, supine dentistry has been the only way taught for more than 30 years, dentists taught sitting up will be in Their 60's now.
To do dentistry effectively you need to sit with feet on floor knees slightly lower than hips with patients mouth a sensible distance from eyes so with mirror you can see perfectly, modern precision dentistry requires good visual field just like people using PC all day the screen has to be correct distance right sort of mouse to avoid RSI.
I mostly work with patients head slightly higher than feet but I am only short 5'2 so if chair completely upright the mouth is too high for me to see back teeth properly, it would be physically impossible for me to root treat an upper molar with patient sitting up, if patient feels gagging I normally tilt head rest upwards slightly to help them. I generally want to accommodate patients feelings and wishes but am not going to hurt myself in the process.
I don't expect a patient to think about my back or shoulders but I do expect if I carefully explain that I do need to be able to see what I am doing and unfortunately sitting bolt upright will affect what treatment options are available,
Most of the complaints are due to tactlessness and insufficient explanation rather than bad dentistry.
Unfortunately some patients do not brush teeth, it is blatantly obvious they have not been cleaned for days if not weeks sometimes you need yo say it like it is.