Prosthodontics & Occlusion · single question
Non-working side occlusal interference — which surface contacts are involved? (LUBL rule)
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Correct answer: B. Lingual inclines of maxillary lingual cusps and buccal inclines of mandibular buccal cusps (LUBL)
✓ B) LUBL = Lingual inclines of maxillary lingual cusps and Buccal inclines of mandibular buccal cusps.
Occlusal interference mnemonics: WUBL = Working (ipsilateral) side: Upper Buccal inclines contact Lower Lingual inclines. LUBL = non-Working (balancing/contralateral) side: Upper Lingual cusp inclines contact Lower Buccal inclines. These are mediotrusive (non-working/balancing) contacts and are considered HARMFUL interferences (Class III lever arm, creates bending force on condyle). Ideal occlusion: working side uses canine guidance OR group function; balancing side should be free of contacts.
Occlusal interference mnemonics: WUBL = Working (ipsilateral) side: Upper Buccal inclines contact Lower Lingual inclines. LUBL = non-Working (balancing/contralateral) side: Upper Lingual cusp inclines contact Lower Buccal inclines. These are mediotrusive (non-working/balancing) contacts and are considered HARMFUL interferences (Class III lever arm, creates bending force on condyle). Ideal occlusion: working side uses canine guidance OR group function; balancing side should be free of contacts.
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