This study is about the long-term survival success of different, externally prepared fillings (Indirect restoration, CAD-CAM blocks) used in teeth with reduced mineral structure, namely Molar Incisor Hypomineralization (MIH), which is called chalk teeth in children.

The aim of this study was to comparatively evaluate the long-term survival times and clinical success of nano-ceramic hybrid CAD-CAM blocks, Grandio Blocs (R) (VOCO), and glass-ceramic blocks, GC INITIAL LiSi (GC AMERICA INC. USA), according to USPHS criteria, after pulpal treatment in mandibular teeth with bilateral moderate molar incisor hypomineralization.

Inclusion Criteria:8-15 years old

• Systemically healthy
• Cooperative (Frankl 3-4)
• Diagnosed with MIH for at least one permanent tooth
• Symmetrical mandibular molars that fit the middle MIH classification (teeth with a tooth score of 7-9 in MIHSI)
• Teeth without indication for root canal treatment
• Teeth without percussion, abscess and fistula formation
• Without periapical lesions
• With post-eruption enamel fractures in the relevant teeth
• Without mobility and pathological gingival pockets
• Patients who agreed to participate in the study.

Exclusion Criteria:Teeth that are suitable for mild and severe classification

• Non-cooperative (Frankl 1 and Frankl 2)
• Teeth with extraction indication
• Teeth that require root canal treatment
• Teeth with periapical lesions, abscesses and fistula formation
• Patients with mobility and pathological gingival pockets

The participants don't want to share the individual information about study.