Dental Anatomy

Structure responsible for root development

Where is the cervical loop located? And what structures/cells does it consist of?

As the cervical loop continues to grow deeper into the ectomesenchyme of the dental sac and enclosing more of the dental papilla, it forms what?

functions to shape the root (s) and induces dentin formation, so it is continueous with coronal dentin

HERS induces ___________ ____ in the root area

What induces the ondontoblastic differentiation in the roots?

Why doesn't enamel form in the roots of the teeth?

What happens to the basement membrane and HERS when root dentin formation is completed?

HERS root sheath disintegrates and may become these groups of epithelial cells located in the mature perio ligament. They may become cystic and cause future problems

misplaced ameloblasts migrating to the root area, abnormally forming enamel on the root surface

small spherical enamel projections found on root surface, especially at CEJ or in furcation areas on molars where root divides

How do enamel pearls appear radiographically?

enamel pearls may be confused as what? But cannot be removed.

apposition of cementum

When does cementogenesis occur?

What induces the cells of the dental sac to differentiate into cementoblasts?

cells of the dental sac become what type of cells when they come in contact with the newly formed root dentin?

move to cover the root dentin laying down cementum matrix

cementum matrix

cementoblasts entrapped in the cementum

matured, calcified cementoid surrounding the cementocytes

formed as a result of the apposition of cementum over the dentin

excess cementum formation; union of the root structure of two or more teeth through the cementum only

In what teeth do concrescence usually occur?

as the crown and root develop, the ectomesenchyme from the dental sac begins to form the___________, and also begins to mineralize to form the _____________

The ends of collagen fibers connect in what 2 structures?

base of the crown where roots of multirooted molars and premolars originates

WHat causes the root trunk to divide into two or three roots?

distorted roots or crown angulation in a formed tooth; results from distortion of HERS caused by injury or pressure

deviation or bend restricted to only the root portion of the tooth, usually less than 90*, may be a result of trauma to the developing tooth

extra roots or supernumerary roots; may be due to trauma, injury, or pressure affecting HERS

What teeth do accessory roots usually affect?

actualy vertical movement of the teeth

occurs as we age, as gingia recedes, no actual tooth movement occurs

Do mandibular or maxillary teeth usually erupt first?

teeth in both jaws erupt in _____

do permanent teeth usually erupt first in boys or girls?

eruption of primary central incisors

eruption of primary lateral incisors

eruption of primary first molars

eruption of primary canines

eruption of primary second molars

tissue that covers newly formed enamel, but fuses with oral epithelium as it erupts

residue formed on newly erupted tooth consisting of the fused tissue of the REE and oral epithelium as well as the dental cuticle placed by ameloblasts on new enamel. easily removed with polishing

absorb alveolar bone between shedding primary teeth and erupting permanent teeth

cause resorption or removal of portions of the primary root of dentin and cementum, as well as small portions of the enamel crown

Why is it so important to keep primary teeth as long as possible?

tendency of the permanent molars to have an eruptive force toward the midline