PICOTS:

P: High Caries Risk Patients with bilateral class I cavities. I: Glass Ionomer with Glass Hybrid Technology. C: Conventional High Viscosity Glass Ionomer. O: Clinical performance (Functional properties Biological properties) using (World Dental Federation) Fédération dentaire internationale (FDI) criteria for dental restorations.

T: 1 year. S: Randomized controlled Trial (split mouth design). Research question:In high caries risk patients with class I cavities will glass ionomer with glass hybrid technology has similar clinical performance as conventional high viscosity glass ionomer

Inclusion Criteria:

• Bilateral class I carious lesions in their occlusal pits and fissures.
• High caries risk patients who has 1 or more cavitated lesion with risk factor declared by Caries Management By Risk Assessment (CAMBRA)
• Co-operative patients approving to participate in the trial.

Exclusion Criteria:

• Disabilities.
• Systemic diseases or severe medically compromised.
• Lack of compliance.
• Evidence of severe bruxism, clenching or temporomandibular joint disorders