Page 66 - Demo

Chapter 464lower jaw can be geo- metrically adjusted to make it more suitable for fixation. Its thick and strong cortical lining lends itself for fixation even when the bone is reduced in size, see Fig. 3. Similar to the fixation of the upper jaw a clamping nut (21) is placed in an angular position to the grooves of the surface plate (20). By tightening the clamping bolt, the clamp axis will force the jaw in a 45-degree angle downwards and forwards against the front block (25). The design of the front block ensures that the jaw can slide slightly under it to prevent the jaw from tilting upwards, while vertical grooves prevent translation sideward. Further translation is limited by sliding the side blocks (24) on the clamp axis against the sides of the jaw and locking them on the axis with a bolt. The design of the blocks is lean to facilitate the movement of the clinician, even when removing dorsally located molars.Fig. 3: Holding device for lower ja (17) lower jaw, (18) surface plate, (19) supporting plate, (20) ground plate, (21) clamping bolt, (22) sliding block, (23) clamp axis, (24) side blocks, (25) front block, (26) clamping nut, (27) top plate of sensor build-up, (28) force-torque sensor, (29) rotation plate, (30) bottom plate, (31) rotation axis, (32) locking bolt To remove teeth, dental surgeons have a large variety of forceps at their disposal. To enhance grip on the tooth, the forceps are designed to specifically fit a certain type of tooth. For these experiments, seven dental forceps (Aesculap, B.Braun, Melsungen, Germany) are used: the left upper molar, right upper molar, upper premolar, upper incisor, lower molar, lower premolar and lower incisor forceps. They are fixated to the end-effector through a custom aluminum holder with two bolts (5mm), see Fig. 4. The aluminum holder is fixated in the end-effector by tightening one clamping bolt. The Tom van Riet.indd 64 26-10-2023 11:59