1. 20. Occlusal Schemes - Monoplane Neutrocentric Concept John Beumer III, DDS, MS and Michael Hamada DDS Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry UCLA School of Dentistry This program of instruction is protected by copyright ©. No portion of this program of instruction may be reproduced, recorded or transferred by any means electronic, digital, photographic, mechanical etc., or by any information storage or retrieval system, without prior permission.

3. Monoplane Occlusion – Neutrocentric Concept Begin by positioning a zero degree protrusive insert, and check to ensure that the incisal guide pin is set at zero and in contact with the incisal guide table. Protrusive inserts Protrusive insert Zero setting

4. Mark the casts indicating midline, crest of the ridge, and the retromolar pad . These landmarks will be used to check your denture setup. Maxilla Midline Anterior land Mandible Ridge Retromolar pad Cast Landmarks

5. Anterior land Cast Landmarks - Maxilla Midline Incisive papilla

6. Lines indicating the crest of the ridge Cast Landmarks -Mandible Midpoint of retromolar pad Land Mark on land indicating the midpoint of the retromolar pad

8. To set the remaining maxillary anterior teeth a clear glass or plastic slab is positioned on the mandibular record base to represent the plane of occlusion. Setting the Maxillary Anterior Teeth Mark indicating midpoint of the retromolar pad

9. Setting the Maxillary Anterior Teeth Soften some baseplate wax and attach some to the ridge lap portion of the other maxillary central incisor and attach it to the record base as shown. Set the lateral incisors and cuspids as shown previously (Section 13c, 1a Lingualized occlusion).

10. Setting the Maxillary Anterior Teeth Note the angulations of the anterior teeth in relation to the occlusal plane when viewed in profile. Occlusal plane

11. Setting the Maxillary Anterior Teeth “ Toed-in” Position Note how the cervical and incisal edges of the cuspid are aligned vertically (yellow line). The facial surface of the cuspid however, is canted inward and appears “toed in” (red line) due to the prominence of the cervical area of the tooth (yellow arrow). The centrals and laterals are inclined slightly towards the distal.

12. Setting Mandibular Anterior Teeth Amount of vertical overlap When using a neutrocentric concept of occlusion is no vertical overlap should be incorporated into the set up.

14. Setting the Mandibular Anterior Teeth The horizontal overlap should be consistent throughout the anterior region. In this setup it is about 1.5 mm.

15. Setting the Mandibular Anterior Teeth Positions of the anterior teeth. The lateral incisors should be placed similar in angulation and position to the central incisors. Note that the cuspids are towed out at the cervical.

22. Monoplane Occlusion – Neutrocentric Concept The flatness of the maxillary premolars is provided by the flat buccal and lingual cusps. Note that in this set up both lingual and buccal cusps contact the plane of occlusion.