It is of importance to investigate the heat transfer and heat dissipation behaviour of the dentino-enamel junction
(DEJ) of human tooth, since dentine and enamel have different thermophysical properties.
The PEIR location was reconfirmed to be just under the dentino-enamel junction
and not connected to the pulp chamber or oral environment.
Criteria for caries assessment of histological tooth sections Score Criteria 0 No demineralisation 1 Enamel demineralisation limited to the outer half (50%) of the enamel layer 2 Enamel demineralisation extending into the inner half of the enamel layer and dentino-enamel junction
3 Dentine demineralisation in its initial layer 4 Frank dentine demineralisation Table 2.
In the present study, the penetration levels used followed a progressing lesion sequence: enamel, subdivided into external and internal, involvement of the dentino-enamel junction
, and then the dentine, subdivided into external and internal involvement, for both the deciduous (7) and permanent teeth.
Caries extending just past the dentino-enamel junction
As stated in evidence-based literature, sharp dental explorer is an inappropriate tool for assessing dental lesions because they can irreversibly damage enamel.2,8 Pit and fissures dental caries usually spread in inverted "V" pattern with broad surface towards dentino-enamel junction
The radicular and pulp chambers are characteristically enlarged, with pulp horns extending to the dentino-enamel junction
[Fadavi and Rowold, 1990; Larmas et al., 1991; Kawakami and TakanoYamamoto, 1997; Shroff et al., 2002; Pereira et al., 2004].
Scenario 2: Preferred material for occlusal lesions (half way to dentino-enamel junction
) on primary molar.