The ideal amount of bone for implant placement is 10 mm vertical and 6 mm horizontal because this dimension provides sufficient bone volume to achieve primary stability and ensure long-term osseointegration. Adequate vertical height prevents implant exposure or failure due to insufficient bone support, while the horizontal width is critical to maintain peri-implant bone health and avoid dehiscence or fenestration. Insufficient bone dimensions can lead to compromised implant anchorage and increased risk of complications. Therefore, a minimum of 10 mm vertical and 6 mm horizontal bone is considered optimal for predictable implant success.

Reference: Oral Implantology, Carl E. Misch, 3rd Edition.