TRV requirements are the same for all, I believe you being a dentist and coming over a test sounds pretty straight forward. However, if they find out that the wife is pregnant, it might lead them to believe that you are doing this so the child could become a citizen. It's all subjective
Please read this to be cautious
http://www.visabureau.com/canada/news/27-02-2012/canadian-immigration-authorities-crackdown-on-pregnancy-scam.aspx