The predominant organic matrix component found in dentine is Type I collagen.

- Dentine, which forms the bulk of a tooth beneath the enamel, is primarily composed of a mineralized matrix.
- However, its organic component plays a crucial role in providing tensile strength and resilience.
- The organic matrix of dentine consists mainly of collagen fibers, and among these, Type I collagen constitutes about 90% of the organic material.
- This type of collagen forms a dense fibrous network that supports mineral deposition and maintains the structural integrity of the dentine.

- Other types of collagen, such as Type II collagen, are mainly found in cartilaginous tissues and are not significant components of dentine. Elastin and keratin are also not predominant components in dentine; elastin is more common in elastic fibers of connective tissue, while keratin is found in epithelial cells and hair.

In summary:
- Type I collagen is the main organic matrix protein in dentine.
- It contributes to structural support and tensile strength.
- Other proteins like elastin, keratin, or Type II collagen are minimally present or absent in dentine.

Reference: Ten Cate's Oral Histology, 9th Edition, Chapter 7 - Dentin, page 122