John Raymond Kinloch, 43, was convicted last month on 33 of 36 counts, including child molestation and possession of child pornography. He was acquitted of molesting a fifth boy.
Kinloch, then a teacher at Wolf Canyon Elementary, was arrested in November 2012 after agents from the San Diego Internet Crimes Against Children Task Force searched his home in San Ysidro.
He was released on bail but re-arrested a week later after an investigation showed that the educator, while posing as a girl on a website called "MeetMe,'' persuaded boys to disrobe during live one-on-one webcam interactions.
Kinloch originally was charged only with molesting the former student, but that number eventually grew to five boys.
"When my son first told me about what happened to him, all I could do was cry and hold him," said the unidentified mother of one of the victims.
"I trusted him with my son, he became part of my family... the way that I see it is that a devil was allowed in a candy store."
Deputy District Attorney Harrison Kennedy said the molestations took place over a 14-year period, from 1996 to 2012.
Defense attorney Kerry Armstrong questioned if it was appropriate to prosecute Kinloch for child molestation when some of the lewd conduct occurred over the Internet.