1. Proximal whole shape: to slightly less than the gingival to the trapezoid. Gingival wall in contact with the point the root side of the healthy tooth structure and the medullary wall parallel, cavity margin of the buccal and lingual sidewalls located in the self-cleaning area, the angle is close to the whole edge at right angles. Cheek, tongue-axis wall slightly polymerization to dental equipment the midline, and the shaft wall and parallel to the tooth long axis.
2. Occlusal surface of the whole shape: as the dove tail. Proximal hole to the expansion of the occlusal surface, including the formation of pit and fissure, including dovetail hole shaped magnum. Between the cheek tongue narrowing to form a dovetail isthmus, the width of the isthmus, usually in posterior teeth where the buccal and lingual cusp spacing of 1/4 to l / 3, the front teeth of the width of the proximal hole tongue side 1/3 ~ l The / dovetail isthmus axis myeloid line Children's dental fear Cause analysis and countermeasures can not overlap angle axis angle of the myeloid line should be blunt. Proximal hole and the occlusal surface of the hole of each line angle requires clear.
3. Depth: deep in front of molars 1.5 ~ 2.0mm hole, molar 2.0 ~~ 2.5mm, proximal deep hole, 1.0 ~ 1.5mm.
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