PMC9402377_01
(a) Panoramic X-ray performed at the first visit. The broken injection needle can be seen at the base of the left coronoid process (arrows). (b) Lateral cephalometric X-ray. The broken injection needle can be seen at the base of the left coronoid process (arrows).
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fig1
Panoramic and lateral radiographs revealed the broken injection needle at the base of the left coronoid process (Figure 1(a) and 1(b)).
(a) Computed tomography (axial). The broken injection needle can be seen at the base of the left coronoid process (arrows). (b) Computed tomography (sagittal). The broken injection needle can be seen at the base of the left coronoid process (arrows).
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fig2
Computed tomography (CT) showed the broken injection needle along the bone surface inside the left coronoid process of the mandible (Figure 2(a) and 2(b)).
(a) Intraoperative X-ray transmission device images. The position of the broken injection needle was confirmed with a sonde using fluoroscopy. (b) Intraoperative photograph. (c) Endoscopic image taken intraoperatively. An incision approximately 25 mm in length was made on the oblique line of the mandible. A broken injection needle pointing upward from the base of the coronoid process was confirmed in the medial pterygoid muscle. Broken injection needles are shown by an arrow.
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fig3
First, the position of the broken injection needle was examined using X-ray fluoroscopy (Figure 3(a)). The broken injection needle pointing upward from the base of the coronoid process was confirmed in the medial pterygoid muscle by endoscopic examination (Figure 3(b) and 3(c)).
The removed disposable dental injection needle and unused disposable dental injection.
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fig4
The removed dental injection needle had broken at the base of the hub of the syringe adaptor (Figure 4).