BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...

Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 257
Since the first contact between tool and bone, the recorded temperature starts to
increase, and in a following study of data, a few points can be made.
Fig. 6 – The fall of temperature.
The starting temperature in the drilling point of the bone is 14.415 ºC. The
temporal sequence of the temperature in the drilling point is shown in this chart:
Table 1
Temperature in the drilling point
0 1 2 3 4 5 6 7 8
14.42 16.96 18.40 21.81 27.61 26.49 32.11 46.18 51.25
The drilling lasted 8.5 seconds. This is the chart for the increase of
temperature according to the time.
Fig. 7 – The increase of temperature.
There is a tendency in the increase of temperature as the drill bit drills the
bone. Some adjustments were made for the analysis of data, and the closest one
was:
(2) Tª = 16.5913 + 0.5518*Time^2.
Against a linear regression, the quadratic function explained up to 95.87% of
the total variability of data (5% more than the linear), making the adjustment