Authorities say he called himself the "Amorous Stallion" online.
On March 24, police say Lackner arranged to meet who he thought was the teenage girl for sex.
Police say the meeting location was a Bensalem video rental store, for a date of dinner and sex. When Lackner arrived he was surrounded by police and arrested.
According to investigators, Lackner had a set of die-cast toy handcuffs in his car.
Police say Lackner confessed to wooing the girl online, even to sending a webcam video of himself performing a lewd act.
Authorities add, Lackner was even cautious enough to send money so the supposed girl could buy a throw-away cell phone to talk in person. Those conversations were recorded by police.
Lackner was arraigned and sent to Bucks County Prison on $1 million bail.
"He's going somewhere where novacaine is not going to take the pain away," said Fred Harran of the Bensalem Police.
Officers have seized computers from Lackner's home and office, to search for any more possible victims.
Lackner worked at Main Street Dental group at its Vineland, New Jersey location. The office was closed Wednesday.
He lives in a Cherry Hill apartment building with his wife and two young children.
The family apparently moved here from Israel about six months ago.
Lackner's brother posted bail for him Wednesday afternoon.
Bensalem police also announced the arrested of 24-year-old Arun Kurikote-Antony, a graduate student from Drexel University.
Police say Kurikote-Antony, an Indian national staying in the United States on a student visa, also chatted with an officer posing as a 14-year-old girl.
Investigators say, after online conversations that were sexual in nature, Kurikote-Antony arranged to meet the girl on February 16, 2009, while school was out for President's Day.
Police say Kurikote-Antony took a cab from his University City apartment to Bensalem with the intention of meeting the girl for sex.
When he arrived at the meeting place, police arrested him. Officers say he had condoms on his person when he was arrested.
Kurikote-Antony has been released after posting 10% of $200,000 bail, on the condition he must surrender his passport upon being released.
He faces a prelminary hearing next Monday.