3.1 Needle Unit The main needle sheath, the needle and the needle base. (see figure 1) 3.2 Rigid Packaging A needle unit together with a rigid needle sheath with butt joints and a rigid needle sheath for the puncture head, form a confined and integrated unit. (see figure 1) 0 3.3 Flexible Packaging A needle unit together with a ready-made plastic tray with a tear-off cover, in which contains a dental injection needle whose puncture head is protected by a rigid needle sheath. Note: The needle sheath with butt joints is dispensable. 3.4 Main Needle Sheath The Needle Protective Packaging: rigid packaging or flexible packaging 3.5 Auxiliary Sheath The main needle sheath was packed inside the auxiliary sheath. 4 Product Marks The mark of the dental injection needle is denoted by the needle base type, the outside diameter, the length of the needle tube and the angle of the blade angle. The type of the needle base is denoted by screw thread needle base L, G(metric internal screw thread needle base) and W(Wyeth internal screw thread needle base). The outside diameter and the length of the needle tube are in "mm". The type of the needle head bevel is denoted by LB (long bevel angle) or SB (short bevel angle). Mark Example: 0.4 mmX40mm Note: The needle base type and the tip blade angle of the needle head can be marked on the packaging. 5 Material The manufacturing material of the dental needle tube shall be consistent with the provisions of GB18457. 6. Physical Requirements 6.1 Colored Marks The mark of the nominal outside diameter of the needle shall be the same color as that of the needle base and/or the sheath (needle sheath for the puncture head or needle sheath with butt joints). And the color shall be consistent with the requirements of YY/T0296. 6.2 Connection Firmness When 22 N axial tension at the rate of 1 mm / s is imposed on the connection point between the dental needle and the needle base, the two parts shall not be loose or disconnected. 6.3 The Smoothness of the Needle-hole Flow The smoothness of the inner needle-hole flow should be one of the following: A corresponding probe selected as one in table 1 shall get through freely or, under the pressure not greater than 100kPs, the flow rate shall not less than that of a needle tube of the smallest inside diameter with the same outside diameter and length consistent with the provisions of GB18457 and, under the same pressure, the tested flow rate shall not be less than 80. An illustration of a flow testing setup is shown in Appendix B.

3.1 Needle Unit The main needle shield, the needle and the needle base. (see figure 1) 3.2 Rigid Packaging A needle unit together with a rigid needle shield with butt joints and a rigid needle shield for the puncture head, form a confined and integrited unit. (see figure 1) 0 3.3 Flexible Packaging A needle unit together with a ready-made plastic tray with a tear-off cover, in which contains a dental injection needle whose puncture head is protected by a rigid needle shield. Note: The needle shield with butt joints is dispensable. 3.4 Main Needle Shield The Needle Protective Packaging: rigid packaging or flexible packaging 3.5 Auxiliary Shield The main needle shield was packed inside the auxiliary shield. 4 Product Marks The mark of the dental injection needle is denoted by the needle base type, theoutside diameter, the length of the needle tube and the angle of the blade angle. The type of the needle base is denoted by screw thread needle base L, G(metric internal screw thread needle base) and W(Wyeth internal screw thread needle base). The outside diameter and the length of the needle tube are in "mm". The type of the needle head bevel is denoted by LB (long bevel angle) or SB (short bevel angle). Mark Example: 0.4 mmX40mm Note: The needle base type and the tip blade angle of the needle head can be marked on the packaging. 5 Material The manufacturing material of the dental needle tube shall be consistent with the provisions of GB18457. 6. Physical Requirements 6.1 Colored Marks The mark of the nominal outside diameter of the needle shall be the same color as that of the needle base and/or the shield (needle shield for the puncture head or needle shield with butt joints). And the color shall be consistent with the requirements of YY/T0296. 6.2 Connection Firmness When 22 N axial tension at the rate of 1 mm / s is imposed on the connection point between the dental needle and the needle base, the two parts shall not be loose or disconnected. 6.3 The Smoothness of the Needle-hole Flow The smoothness of the inner needle-hole flow should be one of the following: A corresponding probe selected as one in table 1 shall get through freely or, under the pressure not greater than 100kPs, the flow rate shall not less than that of a needle tube of the smallest inside diameter with the same outside diameter and length consistent with the provisions of GB18457 and, under the same pressure, the tested flow rate shall not be less than 80. An illustration of a flow testing setup is shown in Appendix B.