The purpose of this study is to determine which method is more effective in postoperative pain control in children undergoing iliac bone grafting for alveoloplasty under general anesthesia: ultrasound-guided transverse abdominal blockade or transversalis fascia plane block

Inclusion Criteria:

• Children aged 7 years and older but under 18 undergoing iliac bone grafting for alveoloplasty

Exclusion Criteria:

• Patients with diseases that affect pain sensitivity differently from the general population (e.g., congenital insensitivity to pain with anhidrosis, complex regional pain syndrome, etc.)
• Cases where there is difficulty in expressing pain (due to cognitive or functional deficits, or limited ability to communicate)
• Unstable vital signs (heart rate, blood pressure)
• Common contraindications for Ropivacaine: 1) Patients with a history of hypersensitivity to this drug or other amide local anesthetics, 2) Patients in a state of major bleeding or shock, 3) Patients with inflammation at or around the site of administration, 4) Patients with sepsis, 5) Intravenous regional anesthesia (Bier block)
• History of allergy to opioid medications
• Severe renal impairment (Creatinine >3.0mg/dL)
• Severe liver function abnormalities (aspartate transaminase > 120 unit/L, alanine aminotransferase > 120 unit/L)
• Peripheral nervous system disorders
• Other cases deemed unsuitable by the researcher