Oral Histology

The growth rate of acellular extrinsic fibre cementum in adult is	0.005 to 0.01 micron per day
what are collagen crimps	They are a specific type of waviness of collagenous fibre, best visualized under polarizer, as a banded structure reflecting the periodicity of the fiber
In PDL, The rate of collage remodelling is highest along the	Root apex
Why PDL does not get mineralized	The rich presence of hylaraoun and chondroitin sulphate deter the minerlaization. Moreover, calcium binding proteins such as S100A4 in extracellular matrix of PDL have been suggested to prevent mineralization
The main type of glycosaminoglyacan in PDL is	Hyaluronan
Zone of Shear in PDL is associated with	eruption of teeth. Remodelling zone associated with teeth eruption and often in mid-region of the PDL
The type of fibers that are increased in PDL to accommodate high occusal loads are	Oxytalan fibers
An abutment teeth, as compared to normal teeth have high numbers of ____________________ fibers	Oxytalan fibers
Periodontal ligament fibroblasts are derived from	Ectomesenchyme
Gingival fibroblasts are derived from	Mesenchyme