4 (mm) Drill point angle 118º Drill length 30, 8 (mm)

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  4. RESULTS AND DISCUSSION

  1. INTRODUCTION

  3 CITAB, University of Tras-os-Montes and Alto Douro, Vila Real, Portugal

  2 LAETA-INEGI/UMNMEE Polytechnic Institute of Bragança, Bragança, Portugal

  Ponta Delgada/Azores, 26-30 July 2015

  6 th

International Conference on Mechanics and Materials in Design

1.1 Objectives

  • Temperature evaluation in composite materials and ex-vivo bovine bones, during the drilling process.
  • Different experimental methods were used, considering the effects of feed-rate, drill speed, hole depth and the temperature variation between different materials.

  2. DRILLING IN COMPOSITE MATERIALS

  • Two biomechanical test blocks with similar density to the human bone were chosen for the composite materials study.
  • Thermocouples (K-type) and a thermographic camera were used to measure the temperature inside the blocks and in the drill bit, respectively.
  • The thermocouples were placed in adjacent positions to the drill bit.
  • Different feed-rates and drill speeds were considered, in order to evaluate the influence on the drilling process.
  • It is concluded that the increase in feed-rate causes lesser increase in the bone tissue temperature.
  • The thermocouples position showed a constant distribution of temperatures, with a decreasing tendency when thermocouple is farthest from the hole.
  • The temperature decreases with increasing drill speed.
  • Temperature in the cutting tool is higher in holes made in composite materials.
  • Temperature in the cutting tool increases with the increasing depth of the hole.
  • For holes with a depth of 30mm were obtained a range equal to [76.2-115.8] and the holes with 8mm the range is equal to [32.8-79.4].
  • In a real situation, the drilling will never exceed 8mm of depth and therefore the measured temperatures in this study are far from the critical values.
  • Eight samples of bovine femur were obtained from a local butchers to the ex-vivo study (mechanical properties similar to human bone, [2]).
  • The samples have been prepared to obtain just the cortical bone tissue (epiphysis, bone marrow and periosteum were removed leaving only the mid-diaphysis).
  • To retain the mechanical and thermo-physical properties, all samples were kept moist in saline solution with gauze swabs and stored in plastic bags at -4ºC.
  • Different parameters were used to evaluate the influence on the drilling process.

  3. DRILLING IN EX-VIVO BOVINE MATERIAL

  Table 3 represents the temperature variation from the drill bit with drill speed 600 and 1200rpm and feed-rate as constant V’’=50mm/min.

3- NUMERICAL MODEL: HEAT PROPAGATION

  Table- 2 Parameters of drilling.

  Table- 4 Temperature variation from drill bit, before and after drilling, in composite materials to holes with 8 mm of depth.

  Table- 1 Parameters of drilling.

  In order to compare the obtained results in composite materials and ex-vivo studies, several holes with 8mm of depth were made with different parameters. Table 4 shows the mean values in different holes made with a drill speed: 800 and 900rpm and a constant feed-rate V’’=50mm/min.

  Drill speed [rpm] Composite material Ex-vivo study M ± SD [Range] M ± SD [Range] 800 (n=8) 68.95 ± 2.60 [65.90-73.60] (n=23) 39.80 ± 6.57 [32.80-48.37] 900 (n=8) 68.00 ± 7.72 [54.20-79.40] (n=25) 39.78 ± 2.08 [35.55-47.02] M Mean value, SD Standard Deviation, n number of holes

  Table- 3 Temperature variation from drill bit, before and after drilling, in composite materials to holes with 30 mm of depth.

  Drill speed [rpm] ΔT [ºC] M ± SD [Range] 600 (n=6) 102.75 ± 14.16 [77.80-115.80] 1200 (n=6) 87.45 ± 7.25 [76.20-97.0] M Mean value, SD Standard Deviation, n number of holes, ΔT Temperature variation

  Parameters Drill diameter 4 (mm) Drill point angle 118º Drill length 8 (mm) Drill speed 800, 900 (rpm) Feed-rate 50 (mm/min)

  Parameters Drill diameter 4 (mm) Drill point angle 118º Drill length 30, 8 (mm) Drill speed 600, 800, 900, 1200 (rpm) Feed-rate 25, 50, 75 (mm/min)

  Graphs (a), (b) and (c) represent the temperatures at different positions of the thermocouples (Side A), with 30mm of depth; feed-rate V'=25, V''=50 and V'''=75mm/min; and constant drill speed 800rpm. Graph (d) represents the temperature, at different positions of the thermocouples in Side B for one drilled hole, with a feed-rate V’= 25mm/min and a drill speed 800rpm.

  [1] Eriksson RA et al. Journal of Prosthetic Dentistry, 50:101-107, 1983. [2] Aerssens J et al. Endocrinology, 139:663-670, 1998. [3] Fernandes et al. BioMedWomen, 20-23 June, 2015.

  Motivation: Find the best drill conditions where the increase in bone temperature would be minimal (considering the criterion of temperature, above 47º C) [1].

  The bone drilling is common in orthopaedic surgery. The success of this surgery is dependent on many factors, namely on the heat generation control during the bone drilling. The main concern in bone drilling is the mechanical and thermal damage induced by inappropriate parameters, as drill speed and feed-rate.

  • In the ex-vivo study only the the thermal camera was used to measure the temperature in drill bit, before and after of drilling process.
  • The holes were carried out at room temperature without cooling.

5. CONCLUSIONS

  • The present study showed the combinations of different drill parameters producing temperatures far below the critical values.
  • The application of high drill speeds and feed-rates reduce the heat generated during bone drilling process and decreasing the osteonecrosis in cortical bone.
  • The values of temperature in the drilling process of ex vivo bovine tissue were lower than the drilling process of composite materials.

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