## 4 Discussion  
The size of the hole with minimum tolerance was proposed as 5.18 mm when preparing the surgical template as described in this technical note. These results may vary depending on the manufacturing conditions (equipment, material). If the described technique was used to fabricate surgical templates with minimum tolerance in the clinical environment with various manufacturing conditions, it will have a positive effect on the ac  
Figure 4: Evaluation of the fabricated surgical guides. (**A**) Surgical guide template with 5.0 mm diameter. (**B**) Surgical guide template with 5.2 mm diameter.  
Figure 5: Evaluation of the fabricated surgical guides. (**A**) Surgical guide with 5.19 mm diameter. (**B**) Surgical guide with 5.18 mm diameter. (**C**) Surgical guide with 5.17 mm diameter.  
curacy of implant positioning. If the equipment and materials do not change, the proposed hole size can be applied to other patients. Therefore, through this technical note, a dental clinician can create a surgical guide optimized for 3D printers and materials owned by the dental clinic.  
[PERSON] et al. [9] reported that drill tolerance was reduced by decreasing the sleeve diameter of the surgical guide. [PERSON] et al. [5] reported that the maximum errors that could be caused by drill tolerance were 2.8 mm and 5.9\({}^{\circ}\) at the apex of the implant and implant axis, respectively. [PERSON] et al. [6] reported that the maximum errors that could be caused by the type of sleeve were 1.3 mm, 2.4 mm, and 5.2\({}^{\circ}\) at the implant apex, implant shoulder, and implant axis, respectively. Therefore, minimum tolerance between the sleeve and the drill can improve the accuracy of the computer guide implant.  
In a systematic review, the reliability, accuracy, and precision of implant surgical guides were reported [23; 24]. It was concluded that the average deviations from the entry and apex of the implant placed using the surgical guide were 1.2 mm and 1.4 mm, and the maximum deviations were 4.5 mm and 7.1 mm [23; 24]. Each step in computer-assisted guided surgery, from examination to planning and execution, has been reported to affect the final accuracy of implant placement [23; 24]. The large tolerance between the guide hole and the drilling bur guides the implant to the wrong position [3; 9]. In this technical note, a way to minimize tolerances was presented.  
This technical note explains how to make a surgical guide with a guide hole of minimum tolerance. Guide holes with minimal tolerances prevent inadequate horizontal movement and allow the implant to be accurately guided to the planned position [3; 9]. The minimum tolerance guide hole made with this technical note can minimize horizontal movement, but the vertical movement is associated with the stopper of the surgical guide, which can control the drilling bur vertically [25].  
The spread of dental 3D printers is increasing, and the use of guides during implant surgery is being made and applied at the dental chairside environment [1; 2; 3; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19]. The method presented in this technique is proposed to fabricate a surgical guide with minimum tolerance without the use of a metal drill key or a separate metal sleeve with the equipment (implant planning software and 3D printer) and printing materials readily available to clinicians. This technical note can also allow the clinicians to eliminate the need for pretreating the sleeve, which saves cost and time.  
There is a limitation in that additional in vitro or clinical studies are required to verify the improvement of the accuracy of the computer guide implant with the present technique. In addition, the lack of visibility and small mouth opening may be a limitation of this note during implant placement. This technical note can be used as information for more accurate placement for clinicians who use 3D printers to create surgical guides and use them for surgery.