i know personally about 15 expats living in bangkok samui and chiang mai. ive asked the same question, the answer was they get it done there. my cousin had a bad accident and had his collar bone/shoulder repaired there too. there are definitely western style dentists and medical facilities that cater to rich thais and the massive expat community. not sure about prices, my last trip there seemed pricey.... id go to the bar and make friends with sone local expats and ask them. they can telll you first hand whhere to go. good luck.
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In a time of universal deceit - telling the truth is a revolutionary act. - Orwell