Restorative Treatments for Primary Molars

Incisal aspect:Restorative

• The incisal edge is centred over the crown and is approximately straight.
• From the incisal edge, the labial surface appears broader and also smoother than the lingual surface.
• The lingual surface tapers towards the cingulum.
• The proximal surfaces of this tooth are somewhat broad. The measurements of the deciduous maxillary central incisor are given in table.

Measurement of deciduous maxillary central incisor:

Maxillary lateral incisor:

In general, the maxillary lateral is similar to the central incisor from all aspects, but its dimensions differ.

From all directions, the crown is smaller.

Read And Learn More: Oral Anatomy Notes

The cervicoincisal length of the crown is more than its mesiodistal width.

The distoincisal angles of the crown are more rounded than those the central incisor.

The roots of lateral incisor are similar in shape as of central incisor, but it is much longer in proportion to its crown. The measurements of deciduous maxillary lateral incisor are given in table .

Measurement of deciduous maxillary lateral incisor:

Maxillary canine:

Crown:

• It is the largest of all anterior teeth.
• This tooth is long and sharp.
• The crown is constricted at cementoenamel junction

Labial aspec:

• The labial side of the maxillary canine does not resemble either the central or the lateral incisor.
• Mesiodistally, the crown is more constricted at the cervix, and the mesial and distal surfaces appear to be convex.
• A well-developed sharp cusp is present instead of an incisal edge.
• As compared with the permanent maxillary canine, the cusp on the primary Canine is much longer and sharper.
• Also mesially, the crest of the contour is not as far down towards the incisal portion.
• When a line is drawn through the contact areas of the deciduous canine, it will bisect the line drawn from the cervix to the tip of the cusp whereas, the contact areas are not at the same level in the permanent canine.
• The mesial slope of the cusp of the primary canine is longer than the distal slope when the cusp is intact.
• The primary canine root is long, slender, and tapering and is more than twice the crown length.

Lingual aspect:

• The enamel ridges present lingually are pronounced that merge with each other.
• There are the cingulum, mesial and distal marginal ridges, and incisal cusp ridges, besides a tubercle at the cusp tip.
• The tubercle is a continuation of the lingual ridge which connects the cingulum with cusp tip.
• The lingual surface is divided into shallow mesiolingual and distolingual fossae by the lingual ridge.
• The root is tapered lingually.
• Above the middle third, the root is usually inclined distally.

Mesial aspect:

• From the mesial aspect, the outline form is similar to that of the lateral and central incisors. However, the difference in its proportion is evident.
• The measurement labiolingually at the cervical third is much greater.

Distal aspect:

The distal outline is the opposite of the mesial aspect of this tooth.

No notable differences may be noted except for the curvature of the cervical line towards the cusp ridge which is less on the mesial surface.

Incisal aspect:

• From the incisal aspect, the crown is essentially diamond-shaped.
• The angles that are present at the mesial and distal contact areas; the cingulum On the lingual side; and the cervical third, or enamel ridge, on the labial surface are more pronounced and less rounded in effect as compared to the permanent canines.
• The tip of the cusp is distal to the centre of the crown, and the slope of the mesial cusp is longer than the slope of the distal cusp. The measurements of deciduous maxillary canine are given in table.

Measurement of deciduous maxillary canine: