Artificial Molar Occlusal Geometry for Stable Lingualized Dentures
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Solution Overview
Problem
Existing artificial teeth for lingualized occlusion suffer from decreased stability and aesthetic issues due to the need to incline maxillary teeth axes, leading to convexities on the buccal sides and concavities on the cervical parts, which destabilize dentures and compromise occlusal stability, especially in cases of unstable jaw positions.
Innovation Solution
The artificial teeth are designed with a buccal convexity suitable for lingualized occlusion, featuring a ratio of 0.9 to 1.22 for the width of the lingual cusp to the pit, an angle difference of 15° to 32° between the lingual and buccal cusps, and a ratio of 0.85 to 0.95 for the areas surrounded by ridges, ensuring stable contact points and improved aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If maxillary teeth axes are inclined to occlude only lingual cusps in lingualized occlusion, then occlusal force guidance to lingual side is improved, but buccal convexities protrude and cervical concavities form, decreasing denture stability
Solution Approach 1:
The invention applies different convexity characteristics to different regions of the artificial teeth. Specifically, the maxillary posterior teeth are designed with enhanced buccal convexities in the occlusal third to counteract the destabilizing effect of tooth axis inclination, while maintaining appropriate cervical contours. This localized modification of surface geometry allows the teeth to provide both proper occlusal force guidance and denture stability.
2Productivity
If maxillary teeth are arranged for lingualized occlusion, then masticatory efficiency is improved, but aesthetic appearance deteriorates due to protruding buccal convexities and concave cervical parts
Solution Approach 1:
The invention modifies the surface geometry of maxillary posterior teeth by providing enhanced buccal convexities in the occlusal third, which restores the natural aesthetic contour of the teeth while maintaining the functional lingualized occlusion configuration. This localized geometric modification ensures that the teeth appear natural from the buccal aspect while still achieving proper occlusal contact.
3Reliability
If artificial teeth with narrow occlusal surfaces are used, then lingualized occlusion is achieved, but stability in unstable jaw positions and temporomandibular joints cannot be ensured
Solution Approach 1:
The invention extends the stabilizing convexities from the traditional occlusal contact point into the buccal dimension. By providing enhanced buccal convexities in the occlusal third of the maxillary posterior teeth, the invention creates additional stabilizing contact areas that extend laterally, thereby improving denture stability in unstable jaw positions without compromising the precision of lingualized occlusal contact.
Data Source
AI summary
In artificial teeth belonging to posterior teeth parts, buccal convexity on an upper jaw side is suitable in occlusion; in a centric occlusal position, lingual cusps on the upper jaw side are fit in central fossae on a lower jaw side; W2/W1 is 0.9 to 1.22 where W1 is a width of a lingual cusp of a first molar tooth on the upper jaw side, and W2 is a width of a pit of a first molar tooth on the lower jaw side one of the artificial teeth in a buccolingual direction; and Sk/Sj is 0.85 to 0.95 where, when the first molar tooth on the lower jaw side is viewed from an occlusal surface, Sj is an area surrounded by ridges of buccal and lingual edges that pass buccal and lingual cusp tips, and mesial and distal marginal ridges, and Sk is an area surrounded by an edge of the pit.