Leeway Space Mandibula pada Siswa Suku Minang di Sekolah Dasar Lubuk Sikaping, Sumatera Barat

The prediction of permanent size of theet which haven’t errupted to determine the value of place needed, availability of space and predict the storage of space. Is one of important aspect in diagnosis and treatment planning on the period of mixed dentition. Prediction method that used commonly is Moyers method which the data is taken from Kaukasoid ras. The objective of the research is to see the difference of leeway space of mandibula on Minang man and woman students of elemantary school Lubuk Sikaping. The method of this research is cross sectional comprative study. 56 samples of mandibula study are taken from the student of SDN 06 Pauh, SDN 09 Pauh, and SDN 10 Pauh Lubuk Sikaping  at  the  age  of  8  to  10  years  and  they  are  Minangnese.  The  results  are  analyzed  statistically  by  t-test  on significant degree 95%. This research indicates that the large average of man mandibula leeway space on the left (1,76 mm) and on the right (1,85 mm). And the average of leeway space of woman mandibula leeway space on the left (2,03  mm)  and  on  the  right  (2,16  mm).  The  analyze  t-test  result  on  the  significant  degree  95%  show  there  is  no significant  difference  (p>0,05)  between  man  and  woman  students.  Therefore,  it  can  be  concluded  that  the  large average of  leeway  space of  man  and  woman  mandibula  in  Minang  students of  elementary  school  Lubuk  Sikaping showed no significant difference in size.