Calibration, blinding and follow-up examination
tightness, tooth
PCT
Before the study commencement, two outcome assessors (WM, AH) were trained and calibrated on the PCT measurement to ensure measurement reliability. Intra and inter examiner agreement was assessed using Intra Class Correlation Coefficient (ICC) that indicated a good agreement and it was ranged from 0.76 to 0.83. The two outcome assessors (WM, AH) were blinded concerning the previously performed interventions and the clinician (KA) only guided them to the treated tooth. PCT was measured between natural premolar teeth in the same quadrant and utilized as a control to capture changes in contact tightness. Differences in PCT were examined before (T0) and immediately after treatment (T1). All patients returned to the clinic and PCT was recorded at three-month (T2), six-month (T3), nine-month (T4), and one-year intervals after restorative treatment (T5).