Dina & Michael Lohan’s Truce Is OVER — Explosive Fight in L.A.

Exclusive 0530-michael-lohan-dina-tmz
So much for new beginnings … Dina and Michael Lohan“s temporary ceasefire came to an explosive end today in L.A. … after the two went nuclear on each other on the set of a talk show.

Sources tell our sources, Dina and Michael were taping a segment for “The Test” — a conflict-resolution talk show launching this fall that uses lie detectors and DNA tests to settle disputes — when things went South.

We”re told things started out great — but soon the finger pointing began … and when the topic of infidelity came up, the gloves flew off.

According to sources, both Michael and Dina accused each other of lying about their past  … as well as who”s really responsible for Lindsay”s downward spiral … and the whole thing ended in a firestorm. We”re told Michael took two lie detector tests, but Dina refused to take any.

Now Dina and Michael — who seemed to bury the hatchet during a burger date on Wednesday — are back on terrible terms.

As we reported, Lindsay”s treatment at Betty Ford involves family counseling — and while both parents said they wanted to cooperate … it looks like it”s not gonna happen.

Saturday kicks off family therapy weekend at Betty Ford — we”re told Dina will be there and Michael wants to participate but fears Dina will now block him.