Table 5.

Summarizes various occlusal concepts in full mouth rehabilitation

S. No.	Occlusal concept/philosophy	Salient features	Limitations
1.	Gnathological concept (McCollum, Stuart, Stallard)	∙ Mutually protected occlusion ∙ Point centric concept ∙ Maximum intercuspation coincides with centric relation (RUM position) ∙ Cusp to fossa relationship with tripodism ∙ Narrow occlusal table	∙ Point centric and cusp-to-fossa tripodization complicate the need to obtain precise gnathologic restorations ∙ Need for a fully adjustable articulator ∙ Cast metal transitional restorations had limitations related to cost, inability to increase occlusal vertical dimension, and changes in mandibular position that cannot be equilibrated easily to a new maximum intercuspal relation
2.	Freedom in centric concept (Schuyler)	∙ Balancing contacts are deleterious and must be avoided in natural dentition ∙ Incisal guidance is a predominating factor for selection of posterior guiding tooth inclines than condylar guidance so it should be the first step of occlusal rehabilitation ∙ Antero-posterior freedom of movement must be incorporated in the restoration	∙ According to gnathologists, the task of adjusting maximum intercuspation contacts in two different positions on an articulator to achieve freedom in centric may result in a lack of precision in both positions ∙ Cusp-to-surface rather than cusp-to-fossa relation affects chewing efficiency
3.	Simplified occlusal design (Wiskott and Belser)	∙ Cusp-fossa relation with only one occlusal contact per tooth ∙ Anterior disclusion during all eccentric movements ∙ Freedom in centric occlusion ∙ Can be adapted to most anterior guidances and varying degrees of group function	∙
4.	Pankey, Mann and Schuyler Philosophy (1960)	∙ Maxillary cuspids in good functional contact ∙ Group function on working side ∙ Absence of nonworking side contacts. ∙ Freedom of movement in centric occlusion is necessary ∙ Long centric is incorporated in the lingual surfaces of maxillary incisors	∙ Cusp to fossae marginal ridge contact ∙ Use of wax functionally generated path techniques can cause errors ∙ The PM philosophy was developed and its use advocated on a non-arcon articulator, which may not accept interocclusal records made at increased occlusal vertical dimension
5.	Twin Table technique-Hobo (1991)	∙ Incisal guidance and condylar path are dependant factors ∙ Posterior teeth are restored using two customised incisal tables: without disclusion; and with disclusion	∙ The cusp angle was fabricated parallel to the measured condylar path, and the cusp angle became too steep ∙ To obtain a standard amount of disclusion with such a steep cusp angle, the incisal path had to be set at an angle that was extremely steep. This made the patient uncomfortable ∙ The customised guide tables were fabricated by means of resin molding. It was technique sensitive
6.	Twin Stage Procedure- Hobo and Takayama	∙ Since cusp angle is the main determinant of occlusion, the measurement of the condylar path is not necessary ∙ The procedure can be indicated for single crowns, fixed prosthodontics, implants, complete-mouth reconstructions, and complete dentures ∙ Suitable for transmandibular disorder patients ∙ It can be incorporated easily with commonly used clinical techniques such as facebow transfer, various centric recording methods, and cusp-fossa waxing	∙ Contraindicated for malocclusion cases
7.	Youdelis Scheme	∙ Cuspal anatomy is so arranged that if the canine disclusion is lost through wear or tooth movement, the posterior teeth drop into group function	∙ Used in advanced periodontitis cases
8.	Nyman and Lindhe Scheme	∙ When there are long tooth-borne cantilevered restorations, balanced occlusion must be achieved ∙ When distal support is present, anterior disclusion is provided	∙ For extremely advanced periodontitis cases ∙ Type of contacts not specified