1. The Basal Dental Implant Association
2. Bone Type

Bone type is one of the key diagnostic factors in dental implant treatment. It helps the implantologist understand how the jawbone may respond to drilling, implant insertion, compression, torque and loading.

The D1 to D4 classification describes the balance between dense cortical bone and softer trabecular bone:

• D1 bone: very dense cortical bone
• D2 bone: dense cortical bone with strong trabecular bone
• D3 bone: thinner cortical bone with softer trabecular bone
• D4 bone: very soft trabecular bone with limited cortical support

The classification is useful, but it is not a diagnosis by itself. The real treatment decision depends on CBCT findings, available bone volume, anatomical anchorage structures, implant design, prosthetic plan and the clinician’s tactile feedback during surgery.

Bone Location Overview

Bone type	Common location	Important anatomical references
D1	Anterior mandible	Mandibular symphysis, parasymphysis, interforaminal mandible, dense buccal and lingual cortical plates
D2	Anterior mandible and many mandibular body areas	Mandibular body, premolar region, porous cortical bone, coarse trabecular bone
D3	Anterior maxilla and some posterior mandibular sites	Premaxilla, anterior maxillary alveolar process, nasal floor cortex, palatal cortical plate
D4	Posterior maxilla	Maxillary molar region, maxillary tuberosity, sinus floor, tubero-pterygoid junction, pterygoid process, vertical process of palatine bone

Implant Selection by Bone Type

Bone type	General implant strategy	Relevant implant examples
D1	Avoid over-compression; use controlled cortical engagement	Ihde Dental BCS, BasalFix Basal, Monoimplant Smooth
D2	Use standard or compressive protocols where cancellous bone is healthy	Ihde Dental KOS Root, TPG Uno, BasalFix Compressive, Monoimplant Smooth
D3	Improve primary stability with controlled under-drilling, taper, deeper threads or cortical tip engagement	Ihde Dental KOS Root, TPG Uno, BasalFix Compressive-Fix, Monoimplant Rough
D4	Do not rely on soft trabecular bone alone; consider strategic cortical or pterygoid anchorage	Ihde Dental BCS, TPG Uno, BasalFix TPI, BasalFix Basal, Monoimplant Rough, Monoimplant MOT

How Dr Genchev’s Case Study Connects to Bone Type

Dr Genchev’s full-mouth rehabilitation case shows why bone type must be evaluated zone by zone. In one patient, different parts of the jaws may require different implant designs and anchorage strategies.

In Marie’s case:

• BCS implants were used where only hard cortical bone remained.
• KOS Root implants were used where cancellous bone could be compressed.
• TPG Uno implants were used where both cancellous and cortical bone were available.
• Posterior maxillary anchorage used structures such as the tubero-pterygoid region, pterygoid process and vertical process of the palatine bone.
• Anterior maxillary anchorage used cancellous compression combined with the nasal floor cortex.

This makes the case useful as an educational example for all four bone types: D1 cortical anchorage, D2 favorable cancellous-cortical balance, D3 anterior maxillary compression with nasal floor support, and D4 posterior maxillary soft bone requiring strategic anchorage.