This study is aimed to evaluate the clinical performance of new One-shade universal composite resin as posterior restoration using US Public Health Service "USPSH" criteria for color match, marginal adaptation, surface texture, retention, recurrent caries and others after 1, 3, 6 and 9 months.

One operator will place all restorations under rubber-dam isolation. The patients will receive restorations with both materials, randomly after shade selection (The shade of single shade universal resin composite "Omnichroma" will be taken before and after placement into the cavity). During the referred period, only the two composites in study will be placed in posterior teeth in the dental office. The various materials' application procedure will be applied according to manufacturer's instructions.

Inclusion Criteria:

• • They should have an acceptable oral hygiene level.

  • Presence of at least two occlusal carious lesions to be restored with two different types of composite.
  • The two studied materials restorations should be used in approximately the same sized lesions or within the same extension.
  • Age range between 25 and 45years.

Exclusion Criteria:

• • Severe or active periodontal or carious disease and heavy bruxism or a traumatic occlusion

  • Patients with a compromised medical history, or had received therapeutic irradiation to the head and neck region.
  • Alcoholic and smoker patients.
  • Patients had participated in a clinical trial within 6 months before commencement of this trial.
  • Patients unable to return for recall appointment