Both groups had average relapses of 0.95 mm in the premolar intercervical distances , of 0.88 mm in the premolar inter-WALA ridge distances , of 1.04 mm in the molar intercusp distances , of 0.74 mm in the molar intercervical distances , and of 0.84 mm in the molar inter-WALA ridge distances ( P < 0.05 ) at checkpoint 3 .