arrangement of the anterior teeth dr.mohammad al sayed 20/4/2008

Arrangement Of The Arrangement Of The Anterior TeethAnterior Teeth

Dr.Mohammad Al SayedDr.Mohammad Al Sayed

20/4/200820/4/2008

Arrangement of the anterior teethArrangement of the anterior teeth::

It is important that the artificial anterior teeth are It is important that the artificial anterior teeth are placed in the same anteroposterior position and placed in the same anteroposterior position and at the same length as the original natural at the same length as the original natural esthetics and phoneticsesthetics and phonetics

Arrangement of the maxillary anterior teethArrangement of the maxillary anterior teeth::

In placing and positioning the maxillary anterior In placing and positioning the maxillary anterior teeth the objective is to provide balance teeth the objective is to provide balance between maximum esthetics and proper between maximum esthetics and proper phonetics. The maxillary anterior teeth should phonetics. The maxillary anterior teeth should support the upper lip in a natural positionsupport the upper lip in a natural position..

11..After the loss of the natural anterior teeth, bone After the loss of the natural anterior teeth, bone resorption usually occurs more on the labial resorption usually occurs more on the labial aspect than on the palatal aspect of the aspect than on the palatal aspect of the maxillary ridge. To compensate for this loss maxillary ridge. To compensate for this loss of bone structure the maxillary anterior teeth of bone structure the maxillary anterior teeth

should be placed labial to the residual ridge should be placed labial to the residual ridge . .

22..The incisive papilla in the edentulous The incisive papilla in the edentulous maxillary arch acts as a guide to proper maxillary arch acts as a guide to proper placement of the maxillary central incisors. placement of the maxillary central incisors. The maxillary central incisors fall The maxillary central incisors fall approximately 8 to 10 mm anterior to the approximately 8 to 10 mm anterior to the point of intersection of a line that bisects the point of intersection of a line that bisects the midline of the palate perpendicularly through midline of the palate perpendicularly through

the incisive papillathe incisive papilla . .33..The labial contour of the teeth should follow The labial contour of the teeth should follow

the labial contour of the occlusal rim the labial contour of the occlusal rim . .44..The right and left maxillary anterior teeth The right and left maxillary anterior teeth

should be positioned symmetrically on either should be positioned symmetrically on either side of the arch side of the arch..

Position of the maxillary central Position of the maxillary central incisorincisor

Mesio-distal inclinationMesio-distal inclination::The maxillary central incisor is placed, so that the long The maxillary central incisor is placed, so that the long axis shows a slight distal inclination, when viewed axis shows a slight distal inclination, when viewed from frontfrom front..Labio-lingual inclinationLabio-lingual inclination::

The neck of the tooth should be slightly depressed when The neck of the tooth should be slightly depressed when viewed from this side, the tooth slopes (incisal edge ) viewed from this side, the tooth slopes (incisal edge ) towards the labial sidetowards the labial side..The incisal edgeThe incisal edge::Is in contact with the occlusal planeIs in contact with the occlusal plane..

Position of the maxillary lateral Position of the maxillary lateral incisorincisor

Mesio-distal inclinationMesio-distal inclination::

The maxillary lateral incisor is placed with its long axis The maxillary lateral incisor is placed with its long axis inclined distally when viewed from the frontinclined distally when viewed from the front..

Labio-lingual inclinationLabio-lingual inclination::

The neck of the maxillary lateral incisor is depressed The neck of the maxillary lateral incisor is depressed more than the central incisor, although the labial more than the central incisor, although the labial surface will be nearly in line with the central incisorsurface will be nearly in line with the central incisor..

The incisal edgeThe incisal edge::

is ½ to 1mm above the level of the occlusal planeis ½ to 1mm above the level of the occlusal plane..

Position of maxillary caninePosition of maxillary canine

Mesio-distal inclinationMesio-distal inclination::The maxillary canine is placed so that the long axis has slight The maxillary canine is placed so that the long axis has slight distal inclination when viewed from the frontdistal inclination when viewed from the front..Labio-lingual inclinationLabio-lingual inclination::

The neck of the maxillary canine is prominent. the tooth axis is The neck of the maxillary canine is prominent. the tooth axis is vertical (straight ) when viewed from the sidevertical (straight ) when viewed from the side..The incisal tipThe incisal tip::Is in contact with the occlusal planeIs in contact with the occlusal plane..

The maxillary canine has two planes on the labial surface; mesial The maxillary canine has two planes on the labial surface; mesial plane should follow the contour of the anterior teeth while the plane should follow the contour of the anterior teeth while the distal plane will be in line with the posterior teethdistal plane will be in line with the posterior teeth..

Arrangement of the mandibular anterior Arrangement of the mandibular anterior teethteeth::

11..The midline of the maxillary central incisor The midline of the maxillary central incisor should be followed while placing the should be followed while placing the

mandibular central incisor mandibular central incisor . .22..The imaginary roots of the mandibular anterior The imaginary roots of the mandibular anterior

teeth should be directed towards the residual teeth should be directed towards the residual ridge. this will often place the mandibular teeth ridge. this will often place the mandibular teeth

labial to the residual ridge labial to the residual ridge . .33..The mandibular anterior teeth should not be in The mandibular anterior teeth should not be in

contact with the maxillary teeth contact with the maxillary teeth..44..The mandibular anterior teeth should not be in contact The mandibular anterior teeth should not be in contact

with the maxillary anterior teeth with the maxillary anterior teeth . .

Position of the mandibular central incisorPosition of the mandibular central incisor::


The long axis is perpendicular to the occlusal The long axis is perpendicular to the occlusal plane (vertically upright)plane (vertically upright)..


The central incisor is placed with its neck The central incisor is placed with its neck depressed and the tooth will show that it’s depressed and the tooth will show that it’s labially inclined when viewed from one sidelabially inclined when viewed from one side..


Are 1-2 mm above the occlusal planeAre 1-2 mm above the occlusal plane..

Position of the mandibular lateral incisorPosition of the mandibular lateral incisor::


The mandibular lateral incisor is placed with its The mandibular lateral incisor is placed with its long axis showing a slight distal inclinationlong axis showing a slight distal inclination..


The labial surface is perpendicular to the The labial surface is perpendicular to the occlusal planeocclusal plane..


Are 1-2 mm above the occlusal planeAre 1-2 mm above the occlusal plane..

Position of the mandibular caninePosition of the mandibular canine::


The mandibular canines are placed with a more distal The mandibular canines are placed with a more distal inclination (neck distally placed) than the mandibular inclination (neck distally placed) than the mandibular lateral incisorslateral incisors..


The neck of the tooth is placed prominently. The tooth The neck of the tooth is placed prominently. The tooth shows a slight lingual inclination (at the incisal edge) shows a slight lingual inclination (at the incisal edge) when viewed from the sidewhen viewed from the side

The incisal tipThe incisal tip::

Lies 1-2 mm above the occlusal planeLies 1-2 mm above the occlusal plane..

Horizontal overlap (over jet)Horizontal overlap (over jet)::

This the horizontal distance between the incisal This the horizontal distance between the incisal edge of the maxillary central incisor and the edge of the maxillary central incisor and the labial surface of the mandibular central labial surface of the mandibular central incisorincisor..

Vertical overlap ( overbite)Vertical overlap ( overbite)::

The maxillary anterior teeth overlap the The maxillary anterior teeth overlap the mandibular anterior teeth and this overlap on mandibular anterior teeth and this overlap on

the vertical axis is called the vertical overlapthe vertical axis is called the vertical overlap . .

Incisal guide angleIncisal guide angle::

The incisal guide angle is the angle formed with the The incisal guide angle is the angle formed with the horizontal plane by drawing a line in the sagital plane horizontal plane by drawing a line in the sagital plane between the incisal edges of the maxillary and between the incisal edges of the maxillary and mandibular central incisors when the teeth are in mandibular central incisors when the teeth are in centric occlusioncentric occlusion..

The amount of vertical and horizontal overlap The amount of vertical and horizontal overlap determines the sagital incisal guidancedetermines the sagital incisal guidance..

Incisal guidance is the path traveled by the mandibular Incisal guidance is the path traveled by the mandibular central incisor from centric occlusion position to the central incisor from centric occlusion position to the

protrusive occlusal positionprotrusive occlusal position . .

The arrangement of the anterior teeth is not The arrangement of the anterior teeth is not complete until they have been checked in complete until they have been checked in protrusive and lateral excursionsprotrusive and lateral excursions..

The incisal pin is locked with the pin in contact The incisal pin is locked with the pin in contact with the guide table. The locknut of the incisal with the guide table. The locknut of the incisal guide is loosened. The anterior teeth are brought guide is loosened. The anterior teeth are brought to an edge to edge position by loosening the to an edge to edge position by loosening the centric lock of the articulator. The incisal guide centric lock of the articulator. The incisal guide table is tilted in an anteroposterior direction so table is tilted in an anteroposterior direction so that the pin is in contact with the incisal giude that the pin is in contact with the incisal giude table ; the locknut of the guide table is table ; the locknut of the guide table is tightenedtightened..

The anterior teeth are brought into left and right The anterior teeth are brought into left and right lateral relation and the lateral wings of the lateral relation and the lateral wings of the guide table is raised until it is in contact with guide table is raised until it is in contact with the incisal pin, in the respective positionthe incisal pin, in the respective position..

The incisal pin should always be in contact with The incisal pin should always be in contact with the incisal guide table while making the incisal guide table while making protrusion, left and right lateral movements. If protrusion, left and right lateral movements. If there is any interference while movement and there is any interference while movement and if the pin is not in contact with the guide table if the pin is not in contact with the guide table at any point in the path of movement, the at any point in the path of movement, the anterior teeth are checked and their placement anterior teeth are checked and their placement is adjustedis adjusted..