Occlusion: Mounting models on a Denar

Summary

This demonstration video provides a step-by-step guide on how to mount upper and lower dental models onto a DNR articulator using a face bow registration and ICP (Intercuspal Position) record. The process involves removing potential interference from silicone bite registrations, positioning the models with chamfers for accurate placement, and ensuring correct seating using a face bow. The articulator is then adjusted, plaster is applied, and the models are securely mounted. The goal is to achieve the correct relationship between the models, condyles, and incisal plane, ensuring accurate alignment for further dental work.

Takeaways

• 😀 Proper preparation of models is essential for accurate mounting on an articulator.
• 😀 Silicone bite registration can help align the upper and lower teeth in ICP (maximum interdigitation) for mounting.
• 😀 Trimming any silicone material interfering with the model seating ensures correct alignment during mounting.
• 😀 Marking the models with chamfers or grooves ensures easy re-alignment with the plaster if models need to be removed.
• 😀 The facebow registration helps position the upper model accurately on the articulator relative to the condyles.
• 😀 Any material that might obstruct the correct seating of the models, such as air bubbles or excess silicone, must be carefully removed.
• 😀 The incisal pin on the articulator is set to zero before closing the articulator, ensuring a consistent setup.
• 😀 Plaster is carefully mixed to avoid lumps and applied to secure the models in place on the articulator.
• 😀 The mounting plate on the articulator can be reused, allowing easy detachment and reattachment of the models.
• 😀 The lower model is mounted using the ICP record to ensure it aligns correctly with the upper model in maximum interdigitation.
• 😀 After mounting, excess plaster is trimmed away to create a smooth and accurate model surface, ready for further use.

Q & A

What is the purpose of using a facebow registration in this demonstration?

The facebow registration is used to accurately mount the upper dental model onto the articulator, ensuring the correct distance between the models and the condyles, and positioning the incisal plane correctly.

Why is it important to remove any material from the occlusal surfaces and gingiva during the preparation of the silicone bite registration?

Removing material from the occlusal surfaces and gingiva ensures that the models will fit properly into the bite registration without any interference, allowing for accurate positioning of the models on the articulator.

What is the significance of cutting chamfers on the base of the models before mounting them?

Chamfers are cut on the model bases to create locational markers that allow the models to be repositioned correctly if they are removed from the plaster work.

How does the silicone bite registration help in mounting the models?

The silicone bite registration captures the precise interdigitation of the upper and lower teeth in maximum occlusion, ensuring accurate positioning when mounting the models on the articulator.

Why is it important to check for small air bubbles or pimples on the model's occlusal surfaces?

Air bubbles or pimples on the occlusal surfaces can cause irregularities in the fit of the model during mounting, leading to inaccurate positioning on the articulator.

What is the role of the incisal pin on the articulator during the mounting process?

The incisal pin on the articulator is set to zero to ensure that the upper and lower models are mounted in the correct relation to the condyles, ensuring proper alignment and function of the articulator.

Why is it necessary to ensure the silicone bite fork stays in place while mounting the model?

It is crucial that the silicone bite fork remains stable during mounting to prevent distortion or movement, which could result in incorrect positioning of the model on the articulator.

What type of plaster is typically used in the mounting process, and why is it chosen?

A special type of plaster, often with lower expansion on setting, is used to minimize any dimensional changes that could affect the accuracy of the mounted models.

How does the mounting process differ when positioning the lower model compared to the upper model?

When mounting the lower model, the silicone ICP record is placed passively on the lower model first, checked for fit, and then the two models are brought together. The articulator is turned upside down for this step, ensuring correct positioning in relation to the upper model.

What is the final step in ensuring the accuracy of the mounted models?

The final step is to trim any excess plaster and ensure that the models fit accurately on the mounting plates. This is done to guarantee that the models can be repositioned correctly if needed and to provide a smooth, presentable finish.