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Each tooth can be described as having a mesial surface and, for posterior teeth, a mesiobuccal (MB) and a mesiolingual (ML) corner or cusp. [1] An occlusal view of a complete maxillary denture. The green line, indicating the dental midline, is the defining line when it comes to mesial-distal direction. The blue arrow, which indicates a mesial ...
Inlays and Onlays are contraindicated in patients with parafunctional habits and heavy occlusal forces. [citation needed] A Parafunctional habit refers to abnormal functioning of oral structures and associated muscles, for example patients who clench or grind their teeth. Occlusal forces are greater on molars when compared to premolars.
The mesial part is that which is towards the incisors. The suffix " -flexus / -flexid " (upper molar / lower molar) is used for the open valleys in the occlusal surfaces of the hypsodont teeth. When this valleys are enclosed, they are called fossetes/fossetids (upper molar / lower molar).
Each tooth is examined from two different aspects: occlusal aspect and then the buccal and labial surfaces with the exclusion of third molars. Tooth that is not in perfect occlusion from both occlusal aspect (in perfect alignment with contact line) and buccal aspect (in perfect alignment with plane of occlusion and in correct interdigitation ...
Increased occlusal stability: teeth are less likely to drift, occlusal contacts are likely to be maintained etc. Increased success of restorations : excessive wear , fractures, cracks are less commonly observed where there is an ideal occlusion
To remove occlusal interferences, Schuyler, introduced the BU-LL and MU-DL rule. This included reduction of the buccal cusp in the upper teeth and the lingual cusp of lower teeth in the frontal plane. Additionally, on the sagittal plane reductions are made on the mesial cusp for upper teeth and distal cusp of the lower teeth.
Premolars are unique to the permanent dentition. Premolars are referred to as bicuspid (has two main cusps), a buccal and a palatal/lingual cusp which are separated by a mesiodistal occlusal fissure. The maxillary premolars are trapezoidal in shape. Whilst the mandibular premolars are rhomboidal in shape.
In order to accept a stainless steel crown, the entire occlusal surface should be reduced by 1–1.5 mm and interproximally contacts should be cleared by cutting a thin mesial and distal portion or slice subgingivally by holding the tip of a thin high-speed bur at 15–20° relative to the long axis of the tooth, to avoid the creation of a ...