Final answer:
Dental calculus, or tartar, does not adhere to tooth surfaces via hemidesmosomes, as these are involved in cellular adhesion, unlike the adhesion of dental calculus.
Step-by-step explanation:
Dental calculus, also known as tartar, is a calcified form of dental plaque. Calculus attaches to tooth surfaces through several mechanisms, but one of these is not correct for its attachment. The options given include the organic pellicle, mechanical locking to tooth/root irregularities, close adaption to cementum, and hemidesmosomes. Of these options, hemidesmosomes do not participate in the adhesion of dental calculus to the tooth surface. Hemidesmosomes are a feature of cellular adhesion to a basement membrane, not mineralized structures like calculus to enamel or cementum.
Hemidesmosomes are cellular structures that connect the epithelial cells to the underlying basement membrane, but they do not play a role in the attachment of dental calculus to tooth surfaces. The other options - A. organic pellicle, B. mechanical locking to tooth/root irregularities, and C. close adaption to cementum - are all involved in the formation and attachment of dental calculus.