DeWald E
J Prosthet Dent. 1979 May;41(5):531-4. doi: 10.1016/0022-3913(79)90087-8.
To minimize the possibility of incomplete casting due to improper pattern orientation relative to the sprue and direction of the casting arm motion, the following precautions should be taken. 1. Locate the pattern in the trailing half of the casting ring 90 to 135 degrees away from the sprue position. 2. Once the pattern is in the position described, locate it downward in the lower outer quarter of the trailing half of the casting ring and secure it in that position. 3. Mark the ring or sprue former so that the invested pattern can be oriented properly in the casting arm. 4. When using an electric casting machine, be certain that the pyrometer is correct. If in doubt, it is advisable to check the melt state of the gold before casting.
为尽量减少因铸型相对于浇道及铸圈运动方向的放置不当而导致铸型不完全的可能性，应采取以下预防措施。1. 将铸型放置在铸圈后半部分，与浇道位置成90至135度角。2. 一旦铸型处于上述位置，将其放置在铸圈后半部分下部外侧四分之一处并向下固定在该位置。3. 在铸圈或浇道成型器上做标记，以便包埋好的铸型能在铸圈中正确定向。4. 使用电动铸圈机时，要确保高温计读数正确。如有疑问，建议在铸造前检查金的熔化状态。
