Inclusion Criteria:  - Patients with a minimum of one proximal carious lesion in a maxillary or mandibular posterior tooth  Selected teeth should have not more than one proximal carious lesion Caries should be extending not more than the outer third of dentin in pre-operative radiograph Presence of antagonist and adjacent teeth for selected molars Vital teeth with no signs or symptoms of pulpitis Anticipated cavity external walls should be in enamel Normal periodontal status and good oral hygiene Mobility grade ≤ 1 Good general health  Exclusion Criteria:  Patients with occlusal, buccal or lingual caries lesions in selected teeth  Two proximal cavities in selected teeth Extensive carious lesions; shallow enamel lesions or old restorations Absence of antagonist or adjacent teeth Non-vital, hyperemic or endo-treated teeth Cavities requiring gingival margin relocation or pulp capping (direct or indirect) Chronic or acute periodontitis Mobility grade 2 or 3 >50 and <18 Years old Systemic conditions, allergy to restorative materials and hospitalized patients Evidence of bruxism and temporomandibular joint disorders Patients with low compliance potential