The bench test (in-person) is the most crucial examination after securing an interview with most schools. It is not possible to perfect the skills required for a bench exam in just two days or one week. Even with years of clinical experience, it takes time to pay fine attention to detail on typodont teeth and to perform well in bench test exams. When considering in-person training courses, we strongly recommend considering bench test preparation centers that offer training courses for longer durations. 

 

CRITERIA FOR BENCH TEST EVALUATIONS

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 Given below are the criteria for the bench test procedures asked in most of the dental schools in the U.S. Please note that the measurement dimensions might vary slightly from school to school but majority of the evaluating criteria remains the same.

ALL-CERAMIC CROWN PREPARATION/TOOTH

Margin Placement:

  • Even with 0.5mm occusal to FGM or CEJ

Finish, margins and walls:

  • Margins and walls are smooth

  • Margins are continuous and well defined

Taper (draw):

  • Taper fully visible ( 8 degrees with line of draw)

  • Line of draw in long axis of tooth

Axial Reduction:

  • Sufficient tissue removal (1.5mm)

  • Rounded line and point angles

  • Smooth curves

Occlusion of Typodont:

  • No more than 4 teeth (2 pair) w/o occlusal contacts in hinge position

  • No interferences in protusive or lateral excursions

Incisa / Cingulum Reduction:

  • 2.0mm on Incisal edge

  • 1.5mm clearance vs mandibular teeth

  • Maintain general anatomy and lingual wall

  • Minimum length of vertical lingual wall (2mm)

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PFM PREPARATION

Margin Placement:

  • Even with 0.5mm occusal to CEJ

Finish, margins and walls:

  • Margins and walls are smooth

  • Margins are continuous and well defined

Taper (draw):

  • Taper fully visible ( 8 degrees with line of draw)

  • Ideal path of draw with the other abutment preparation

Axial Reduction:

  • Sufficient tissue removal for convenience, retention, and resistance form

  • Rounded line and point angles

  • Smooth curves

Occlusion of Typodont:

  • No more than 4 teeth (2 pair) w/o occlusal contacts in hinge position

  • No interferences in protusive or lateral excursions

Occlusal Reduction:

  • 2.0mm 

  • Maintain general occlusal anatomy with identifiable triangular ridges and grooves

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FULL GOLD CROWN PREPARATION

Margin Placement:

  • Even with 0.5mm occusal to CEJ

Finish, margins and walls:

  • Margins and walls are smooth

  • Margins are continuous and well defined

Taper (draw):

  • Taper fully visible ( 8 degrees with line of draw)

  • Ideal path of draw with the other abutment preparation

Axial Reduction:

  • Sufficient tissue removal for convenience, retention, and resistance form

  • Rounded line and point angles

  • Smooth curves

Occlusion of Typodont:

  • No more than 4 teeth (2 pair) w/o occlusal contacts in hinge position

  • No interferences in protusive or lateral excursions

Occlusal Reduction:

  • 1.5mm 

  • Maintain general occlusal anatomy with identifiable triangular ridges and grooves

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CLASS II AMALGAM 

PREPARATION - Clinically Ideal - 25

Finish of Walls and Margins:

  • Enamel entirely supported walls and margins smooth cavity prep well-defined

Retention:

  • Wall angulation (convergence /divergence) appropriate for restorative material

  • Retention appropriate for restorative material

  • B & L walls slightly convergent occlusally with slight undercut

  • Under cusps (5'-7")

  • Prox box: B & L walls  slightly convergent occlusally

  • Retentive grooves: Tactile and visually present

  • Located in "dentin" as an extension of the axial wall

  • Directed toward B & L w/o undermining prox enamel

External Outline Form:

  • External outline appropriate for convenience, removal of decalcification and contiguous fissures

  • Lines and curves smooth and consistent with tooth form

  • No damage to adjacent teeth and soft tissues

  • Centered over grooves, smooth continuous 1.0mm isthmus B & L width

  • Proximal: Cervical Margins free of contact w/o wedge

  • Proximal with no adjacent tooth: Box 2.5-3.0mm wide at occlusal

  • Gingival seat = 3.0mm deep (pre-molar)

  •  Gingival seat parallel to occlusal. Plane or flat

  • No damage to adjacent tooth

Internal Outline Form 

  • Resistance form adequate

  • Caries re removal adequate

  • Tooth loss not excessive

  • Pulpal depth 1.5 2mm at cusps and ridges 

  • Axial wall: 1.2-1.5mm deep -premolar, 1.5-1.7mm deep -molars

  • Convex B-L and parallel to external tooth contour

  • Gingival seat: minimum 1mm wide

  • Axiopulpal line angle is rounded or beveled 

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CLASS V PREPARATION - Clinically Ideal - 25

Finish of Walls and Margins:

  • Enamel entirely supported walls and margins smooth cavity prep well-defined

Retention:

  • Wall angulation (convergence /divergence) appropriate for restorative material retention appropriate for restorative material

  • Ideal bevel width 0.25-0.5mm (only for composite)

  • Ideal bevel angulation 30 degrees

  • No bevel for GI restorations

External Outline Form:

  • External outline appropriate for convenience, removal of decalcification and contiguous fissures

  • Lines and curves smooth and consistent with tooth form

  • No damage to adjacent teeth and soft tissues

  • 4.0mm Mesio (6.0mm for amalgam preparation on. molars)

  • 2.0mm Inciso-Cervically

  • Cervical wall of prep 1.0mm from the gingival margin

Internal Outline Form:

  • Resistance form adequate

  • Caries re removal adequate

  • Tooth loss not excessive

  • Ideal depth 1.5mm

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PROVISIONAL FPD RESTORATION / TEETH

Margin:

  • Tooth-restoration junction non-detectable with an explorer

Surface and Finish:

  • Uniformly smooth, no voids and polished

Occlusal:

  • Visual contacts on restoration in CO

  • No more than 4 teeth (2 pair) w/o occlusal contacts in hinge position

  • No interferences in protrusive or lateral exursions

Facial -Lingual Contours:

  • Facial/lingual contours are harmonious with teeth forming proper embrasures as viewed occlusally or from mesial when looking down the facial/lingual corridors

Connector:

  • Connector is in correct position and of proper size

  • 4-5MM occlusal/cervically and 

  • 3mm labial/lingual at it's widest

Occlusal Anatomy:

Clearly defined with proper identifiable cusp points, ridges, and grooves of proper height and depth

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PROVISIONAL FPD RESTORATION / SANITARY PONTIC

Soft Tissue Surface:

  • Sanitary pontic, convex, with uniform 1mm clearance between the height of ridge and cervical extension of pontic

Surface and Finish:

  • Uniformly smooth, no voids and polished

Facial -Lingual Contours:

  • Interproximal contours are harmonious with adjacent teeth and conductive for general health

Interpersonal Contours:

  • Interpersonal contours are harmonious with adjacent teeth and conductive for general health

Proximal Contacts:

  • Proximal contact is harmonious with adjacent teeth and conductive for general health

Occlusal:

  • Visual contacts on restoration in CO

  • No more than 4 teeth (2 pair) w/o occlusal contacts in hinge position

  • No interferences in protrusive or lateral exursions

Occlusal Anatomy:

Clearly defined with proper identifiable cusp points, ridges, and grooves of proper height and depth

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