The development of dental caries is multi-factorial mainly due to the presence of 4 elements which are: dental biofilm, fermentable carbohydrates , dental hard tissue and time. Other additional social and environmental factors can have a substantial impact on the onset and course of the disease. Dietary habits, oral hygiene, salivary flow and fluoride exposure are key factors that influence the susceptibility to dental caries. If dental caries is properly managed, it is a preventable and reversible disease. The proximal teeth surfaces are the most susceptible sites for demineralization from the acidic byproducts. In modern restorative dentistry, clinicians always seek solutions that streamline procedures, improve outcomes and reduce chair time for patients. Traditional light-cured composite systems often involve a complex seven step process which includes etching, priming, bonding and curing which consumes from 90 to 120 seconds to be completed. With each additional step, the risk of technique errors increases, potentially compromising the longevity of the restoration. Self-cure composites, with their simplified application process, are emerging as a preferred choice over the traditional seven-step composite materials. Recently, a novel self-cured high-performance bulk-fill restorative material has been introduced into the market (Stela, SDI, Victoria, Australia). It's particularly known for its "unlimited" depth of cure and self-adhesive properties.

Inclusion Criteria:

1. Subjects between the ages of 18-47 years old
2. Primary caries removal
3. Good or moderate oral hygiene
4. Free of periodontal diseases (probing depth and attachment levels within normal limits/ no furcation involvement/ no mobility)
5. Cooperative patients who agree to keep the scheduled recall appointments for data collection and maintenance

Exclusion Criteria:

1. Composite or amalgam removal
2. Caries extended to the cemento-enamel junction in Class II caries
3. Grade II or III mobility
4. Considerable periodontal disease without treatment
5. Endodontically treated teeth with extensive loss of tooth tissues
6. Severe wear facets and/or parafunctional activities as clenching or nocturnal bruxism.
7. Subjects who are pregnant during the duration of the study
8. Subjects with high caries activity