Lingual side

Tooth type and position are often noted with a combination of numbers and letters, depending on the species. Each tooth has a lingual side, adjacent to the tongue, and a labial surface, which is closest to the lips (if there are any). The posterior teeth are at the back of the mouth, and the anterior to the front. The occlusal surface is the area where opposing teeth meet during chewing or biting. 

In clinical dentistry, it is generally accepted that the mandibular front teeth has low caries sensitivity, and the maxillary front teeth has high (e.g. nursing bottle caries) and the caries incidence of the buccal side of teeth in old person is higher than the lingual side. The results of this study have confirmed these clinical situations. 

Figure 15. Case B7. Stereoptical microscope images of the gold-coated molar unit that broke off the end. The initial starting point of fracture is in the upper left in (a). A thermal crack popped in more than halfway through the piece as shown by the first set of arrows Final fracture radiated in steps outwards towards the lingual side as shown by the second set of arrows, (b) shows a close-up of the origin site A. The core ceramic had some surface irregularities in the surface including waviness. The veneer also had grinding-adjustments that penetrated through the veneer into the core ceramic.

Stafne cyst is also called lingual salivary gland inclusion defect. This defect is due to the displacement of a sahvary gland on the lingual side of the mandible (Fig. 13.8). 

Fig.13.18. Patient A, mandibular canal passes the wisdom tooth on the lingual side. Patient B, nerve canal passes straight between the roots. Patient C, nerve canal meanders between the roots from lingual side between the roots to the buccal side...

Beginning distally from the wisdom tooth, the mandibular canal is identified and then followed through the sUces along the wisdom tooth. The determination of the pathway is, in most cases, relatively easy. The deformation of the channel on the lingual or buccal side of the roots is sometimes considerable, and sometimes the channel runs only slit-like within the cortex (Fig.l3.18A,B,C). 

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