Abstract：
OBJECTIVE: Recently, other combinations of teeth are claimed to be better predictors for size estimation of permanent canine and premolars. The present study aimed to determine which combinations of teeth presented an appropriate predictor in Western Australians using digital technology.
METHODS: A total of 500 (323 females, 177 males) participants meeting the inclusion criteria were randomly selected from private orthodontic clinics. Mesiodistal dimensions of selected teeth obtained from pre-orthodontic treatment digital records were analyzed using SPSS 20. Fifteen possible combinations of teeth were used to determine the best prediction capability.
RESULTS: Different combinations of teeth showed a higher correlation with the sum of permanent canine and premolars. In females, group 13 (Mandibular incisors and maxillary first molars) and in males, group 15 (mandibular incisors, maxillary central incisors, and first molars) and group 14 (mandibular incisors and first molars) showed a higher correlation in maxilla and mandible respectively. Linear regression equations were developed based on the best predictor for each arch and gender.
CONCLUSIONS: Permanent mandibular incisors may not be better predictors when used alone. Newly developed equations, based on different combinations of teeth, more accurately predicted the sum of mesiodistal dimensions of permanent canine and premolars in the Western Australian population.
METHODS: A total of 500 (323 females, 177 males) participants meeting the inclusion criteria were randomly selected from private orthodontic clinics. Mesiodistal dimensions of selected teeth obtained from pre-orthodontic treatment digital records were analyzed using SPSS 20. Fifteen possible combinations of teeth were used to determine the best prediction capability.
RESULTS: Different combinations of teeth showed a higher correlation with the sum of permanent canine and premolars. In females, group 13 (Mandibular incisors and maxillary first molars) and in males, group 15 (mandibular incisors, maxillary central incisors, and first molars) and group 14 (mandibular incisors and first molars) showed a higher correlation in maxilla and mandible respectively. Linear regression equations were developed based on the best predictor for each arch and gender.
CONCLUSIONS: Permanent mandibular incisors may not be better predictors when used alone. Newly developed equations, based on different combinations of teeth, more accurately predicted the sum of mesiodistal dimensions of permanent canine and premolars in the Western Australian population.
摘要：
目标：最近，其他牙齿组合被认为是永久性犬齿和前磨牙大小估计的更好预测因子。本研究旨在确定哪些牙齿组合在使用数字技术的西澳大利亚人中提供了适当的预测指标。
方法：总共500名（323名女性，从私人正畸诊所随机选择符合纳入标准的177名男性）参与者。使用SPSS20分析从正畸治疗前数字记录中获得的选定牙齿的中远端尺寸。使用15种可能的牙齿组合来确定最佳预测能力。
结果：牙齿的不同组合与永久性犬齿和前磨牙的总和具有更高的相关性。在女性中，第13组（下颌切牙和上颌第一磨牙）和男性，第15组(下颌切牙，上颌中切牙,和第一磨牙）和第14组（下颌切牙和第一磨牙）分别在上颌骨和下颌骨中显示出更高的相关性。线性回归方程是根据每个足弓和性别的最佳预测因子建立的。
结论：下颌恒牙单独使用时可能不是更好的预测因子。新发展的方程，基于不同的牙齿组合，更准确地预测了西澳大利亚州人群中永久性犬和前磨牙的中远尺寸总和。
方法：总共500名（323名女性，从私人正畸诊所随机选择符合纳入标准的177名男性）参与者。使用SPSS20分析从正畸治疗前数字记录中获得的选定牙齿的中远端尺寸。使用15种可能的牙齿组合来确定最佳预测能力。
结果：牙齿的不同组合与永久性犬齿和前磨牙的总和具有更高的相关性。在女性中，第13组（下颌切牙和上颌第一磨牙）和男性，第15组(下颌切牙，上颌中切牙,和第一磨牙）和第14组（下颌切牙和第一磨牙）分别在上颌骨和下颌骨中显示出更高的相关性。线性回归方程是根据每个足弓和性别的最佳预测因子建立的。
结论：下颌恒牙单独使用时可能不是更好的预测因子。新发展的方程，基于不同的牙齿组合，更准确地预测了西澳大利亚州人群中永久性犬和前磨牙的中远尺寸总和。
