This study is designed to compare major failure rate between ART ( excavation of caries with hand instruments and placing glass ionomer restoration without the use of rotary instruments) versus hall technique ( placing a stainless steel crown on the decayed primary molar without prepartion or caries removal)

Inclusion Criteria

• Age: From 4 to 6 years.
• Cooperative children
• Children with no systemic disease, occlusal problems or bad habits.
• Primary molars with vital pulp.
• Class II Caries in primary molars within enamel/dentin.
• Molars in occlusion with the antagonist tooth/teeth.
• Teeth with no developmental anomalies.
• Absence of spontaneous pain and tenderness to percussion.
• Absence of any radiolucency in furcation and/or periradicular regions.
• No pathological and internal/external resorption.

Exclusion criteria:

• Presence of signs and symptoms of necrosis (Fistula, abscess, mobility or furcation involvement).
• Root caries.
• History of Spontaneous pain.