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OralCavityModel  
Updated Aug 5, 2008 by Jonathan...@googlemail.com

#Oral Cavity Model.

Oral Cavity Model: haptic tooth/teeth

The clinicians specified how tooth/teeth should be modelled as a 3D image in a computer environment. The clinicians ‘requirements are similar to each other. Their specification is to model a virtual oral cavity and not just to model tooth/teeth. However, they recognise the pragmatics of not being able to possibly make the entire oral cavity as ‘haptic-enabled’ – providing haptic feedback. A ‘realistic’ 3D oral cavity model, according to the clinicians could include:

Tooth to be prepared

The clinicians recommend modelling a ‘first-lower molar tooth’ to be fully haptic-enabled. The 3D graphic model could include the parts i.e. enamel, dentine and pulp. The type of dental carries to be prepared can be ‘occlusal surface’ (a type of dental carries occurring at the top or a tooth mainly in the fissure) and ‘proximal surface’ (a type of dental carries occurring at the side of a tooth typically between two adjacent teeth proximal or approximally). The clinicians asked that the model looks as realistic as possible including the colour of the different parts of a tooth and the carries. Relative thicknesses of each part should be carefully designed.
Adjacent teeth and opposing teeth
Adjacent teeth are important and at least need to be haptic-enabled to some extent. They suggested that at least two adjacent teeth at each side of the haptic tooth be present. In reality, adjacent teeth may be used as a finger-rest (this requirement links with the dental station set-up discussed above). They also want opposing tooth/teeth (i.e. tooth opposite the one being prepared) to be present and collision detection with the graphic dental tools be modelled.
Other tissues serve as space constraints
The clinicians suggest that gums, tongue, cheek and lips need to be present. Although they are sympathetic that these graphic tissues may not be fully-haptic enabled, they insist that in some way, the operator needs to be aware of the ‘small’ space of oral cavity he or she is operating in. For future development, they suggested that periodontal tissues may also need to have the underlying bone, possibly with some of the blood supplies in place.

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