Celluloid conventional matrix (Comparator group)
All procedural steps were performed by the primary investigator with the benefit of magnification (univet prismatic loupes 6.0 × 400 with AIRX with/red MKU60 with LED EOS 2.0 s). A standard shade guide (VOCO Grandio SO, Germany) was utilized to pick the appropriate shade of restorative material, and a blue 6*6 heavy rubber dam (Sanctuary Powder Free Latex Dental Dam, Malaysia) with universal canine & premolar clamp No.1 stainless steel (DENTECH KSK, Japan) was employed for isolation because adequate isolation is necessary for biofilm staining with the revealing agent and subsequent mechanical removal with an aluminum oxide spray.