Dental Cast Mounting Procedure

Centralizing Maxillary and Mandibular Casts

• The primary concern when centralizing the maxillary and mandibular casts is to ensure accurate mounting and articulation.

Incisal Pin and Mounting

• If the incisal pin does not touch the incisal table, it can cause a possible error during mounting, leading to incorrect articulation.

Midline Transference

• A wrong transference of the midline of the articulator with that of the casts can occur due to shifting of the midline.

Setting the Articulator

• The incisal guide table should be set for the articulator by adjusting the incisal pin to touch the incisal table.
• The condylar track should be set at 30-40 degrees for the articulator.
• The Bennett angle should be set at 15-20 degrees for the articulator.
• The lateral condylar guidance should be set by adjusting the condylar elements to match the patient's lateral movement.

Attaching Casts to the Articulator

• The procedure of attaching the maxillary and mandibular casts to the articulator in their recorded jaw relation is called mounting.

Pre-Mounting Preparation

• Before mounting on a Semi-Adjustable articulator (Class III articulator), the movable surfaces of the articulator should be ensured to be free of debris and lubricated.

Face Bow Usage

• The face bow is used in a type of mounting called face bow transfer.

Zeroing the Articulator

• The main purpose of zeroing or resetting the articulator before mounting is to eliminate any existing condylar settings and ensure accurate articulation.

Aligning the Midline

• It is important to align the midline of the maxillary occlusion rim to the center of the cross midline on the mounting table to ensure accurate transfer of the maxillary cast to the articulator.

Post-Pouring Procedure

• After pouring plaster over the base of the cast and closing the upper member until the incisal pin touches the incisal table, the excess plaster should be removed and the cast should be allowed to set.

Trimming the Base

• Trimming at the base of the cast is necessary if there is not enough space to ensure proper mounting and articulation.

Posterior Interference

• It is necessary to ensure there is no posterior interference between the maxillary and mandibular casts to prevent inaccurate articulation.

Midline Alignment

• Careful attention should be paid to aligning the midline of the maxillary occlusal rim to the center of the cross midline on the mounting table to ensure accurate transfer of the maxillary cast to the articulator.

Pre-Mounting Mandibular Cast

• Before mounting the mandibular cast, the maxillary cast should be properly mounted and the articulator should be zeroed to ensure accurate articulation.