Home / Products / Orthodontic Mini-implant Characteristics Description Implant is divided into two parts, SI and BI. SI is the part contacting soft tissue and BI is in contact with alveolar bone or hard tissue. The system is designed for easy of insertion anywhere in the oral cavity. Implant selection depends on soft tissue thickness and bone quality. Thicker soft tissue will require longer SI. How to use: 1. Treatment planning & surgical procedure 2. Site selections 3. Problems and solutions