oise of 
on the 
| of the 
nt of 
lists to 
more 
casts 
for the 
phases 
| to: 1) 
t n° 5) 
Pair B 
ter the 
Pair À 
fter six 
e been 
rically 
) carry 
naking 
metric 
 lengh 
ect for 
e casts 
t side, 
to the 
dels) 
T Way 
1:1. of 
ı sides 
2 mm 
tion is 
a have 
itoCad 
sional 
ible to 
alysis 
survey 
ons of 
> cage, 
on an 
ry out 
on the 
ect to 
some 
e and 
ab.2). 
   
   
   
   
   
  
  
    
   
  
    
   
   
  
   
  
     
Fig. 2 
Pair of the photographs of the front view 
  
ORIENTATION DATE - RESIDUALS ON PHOTO 
COORDINATES 
  
model name: den1 
  
  
  
photo 1-2 
Pt.NO DXG(mm) DYG(mm) DZG(mm) 
101 0.009 - 0.236 - 0.068 
103 0.032 - 0.075 0.030 
104 - 0.060 - 0.304 0.071 
102 - 0.026 0.011 0.012 
105 - 0.040 - 0.047 - 0.142 
109 0.228 0.246 0.218 
108 - 0.081 0.275 -0.211 
110 - 0.060 0.131 0.090 
  
model name: den2 
photo 3-4 
  
  
  
Pt.NO DXG(mm) DYG(mm) DZG(mm) 
119 0.011 0.082 0.132 
120 - 0.066 - 0.106 0.119 
115 - 0.013 - 0.061 - 0.050 
113 - 0.072 - 0.045 - 0.030 
111 0.057 - 0.052 0.152 
112 0.034 - 0.025 0.029 
117 - 0.023 - 0.055 - 0.127 
118 - 0.002 0.095 - 0.120 
116 0.075 0.167 - 0.105 
  
model name: den3 
  
  
  
photo 5-6 
Pt.NO DXG(mm) DYG(mm) DZG(mm) 
138 - 0.041 - 0.046 0.103 
134 0.119 0.124 - 0.107 
133 0.019 - 0.076 0.096 
131 - 0.031 0.086 0.017 
132 - 0.024 - 0.125 0.103 
139 0.001 0.016 0.050 
136 - 0.063 - 0.022 - 0.169 
137 0.020 0.043 - 0.093 
Table 1 - Orientation data 
The data analysis shows a constant expansion, even 
after the removal of the appliance at the level of the 
molar while the distance between the incisors 
undergoes a reduction probably due to the dental 
displacement of the transeptual fibres . 
This is an initial result that only partially uses the 
potential of the photogrammetric tecnique. As 
previously mentioned, this tecnique is able to provide 
an amount of data that will surely allow more thorogh 
analyses. 
The photogrammetry applied to dentistry allows a 
more effective study. In fact, the metric study in this 
particular field could provide a biological explanation 
of the orthopedical phenomenon determined by the 
expansion appliance (Curry, 1982).