INJECTION SYSTEM FOR DENTAL USE

Abstract

The present invention, entitled "Dental Injection System," proposes a dental injection system for plastics and lithium disilicate with an integrated compressed air system. The Dental Injection System allows for configuration of the machine's heating and compressed air processes, enabling the equipment to inject a wide range of materials. Machine configuration and control are performed via a touchscreen, allowing for the saving of parameters for injecting specific materials. The touchscreen system is automated and intuitive. The Dental Injection System (10) comprises an Injection Section (20) for a Dental Muffle (21), a Heating Section (30) for melting material, a Control Section (40) for configuring temperature and air pressure parameters, a Motor Section (50), and an Air Section (60).

Description

Dental Injection System. OBJECT AND SCOPE OF THE INVENTION This invention is in the mechanical field and consists of a device that has a system for injecting plastic and lithium disilicate; its use is primarily in the dental field. BACKGROUND OF THE INVENTION After several years of research, it has been observed that automated injection molding machines for manufacturing dental prostheses with flexible plastics have limitations due to the very few configuration parameters. Furthermore, they have a major limitation: their operation requires additional accessories such as an air compressor separate from the machine. Additionally, the configuration of these more sophisticated machines is limited by their small data processing capacity and the few configuration options available. Equipment such as the THERMOJET22 from VERTEX is available on the market. It features a similar system but requires a compressor to operate. These machines only allow control of the heating and injection process, as that is their primary function. In addition to the limitations of the air compressor, the technical limitations of these machines mean that users can only inject flexible plastics, making them impractical and inefficient to operate. There is no equipment that integrates all the functions for plastic injection molding and offers the option of injecting lithium disilicate pellets. TECHNICAL PROBLEM TO BE SOLVED Knowing these shortcomings, in the proposed invention called Injection System For Dental Use, a dental injection system for plastics and lithium disilicates with an integrated compressed air system is proposed. onfrZLn / Lznz / e / YiAi The Dental Injection System allows you to configure the machine's heating and compressed air processes, enabling it to inject a wide range of materials. Machine configuration and control are performed via a touchscreen, allowing you to save parameters for injecting specific materials; the touchscreen system is automated and intuitive. BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows the left side view of the Dental Injection System (10). Figure 2 shows the right side view of the Dental Injection System (10). Figure 3 shows the rear view of the Dental Injection System (10) without Refractory Ceramic Bed (33). Figure 4 shows the rear view of the Dental Injection System (10) with Refractory Ceramic Bed (33). Figure 5 shows the front view of the Dental Injection System (10) without Refractory Ceramic Bed (33). Figure 6 shows the front view of the Dental Injection System (10) with Refractory Ceramic Bed (33). Figure 7 shows the top view of the Dental Injection System (10) with the Dental Muffle (21) pressed with the Pressing Screw (23). Figure 8 shows the top view of the Dental Injection System (10) with the Dental Muffle (21) without the Pressing Screw (23). Figure 9 shows the top view of the Dental Injection System (10) with the Dental Muffle (21), without the Pressing Screw (23) and with the Screw Base (25) open. Figure 10 shows the top view of the Dental Injection System (10) without the Dental Muffle (21), without the Pressing Screw (23) and with the Screw Base (25) open. Figure 11 shows the top view of the Dental Injection System (10) without the Dental Muffle (21), without the Pressing Screw (23), with the Screw Base (25) open and with the Handle (35) inside the Barrel (34). onfrZLn / Lznz / e / YiAi Figure 12 shows the top view of the Dental Injection System (10) without the Dental Muffle (21), without the Pressing Screw (23), with the Screw Base (25) open and with the Handle (35) inside the Barrel (34). Figure 13 shows the front view of the Pressing Screw (23). Figure 14 shows the top and perspective view of a Maneral (35). Figure 15 shows the side view of a Handle (35). Figure 16 shows the top and perspective view of an Injection Tube (37) with Injection Cap (38). Figure 17 shows the top and perspective view of Injection Cap (38). Figure 18 shows the side view of an Injection Tube (37) with Injection Cap (38). Figure 19 shows the top view of a Pill Press (70). Figure 20 shows the perspective view of a Pill Squeezer (70). QnfrZLn / iznz / e / YiAi For better reference, a list of the elements indicated in the figures is shown below: Dental Injection System (10). Injection Section (20). Heat Section (30). Control Section (40). Engine Section (50). Air Section (60). Support Posts (11). Base (12). Dental Muffle (21). Protective Goals (22). Anchor Holes (220). Screw Hole (221). Pressing Screw (23). Anchor Post (24). Screw Base (25). Screw End (26). Balero (27). Injection Port (28). Anchor (29) Resistance (31). Thermocouple (32). Refractory Ceramic Bed (33). Cannon (34). Maneral (35). Piston Stop (36). Injection Tube (37). Injection Cap (38). Piston (41). Screen (42). Control Card (43). Alarm (44). Reset button (45). Power button (46). Motor (51). Motor Starter (53). Air Tank (61). Non-return valve (611) Solenoid valve (62). Manometer (63). Safety Valve (64). Pressure Gauge (65). Purge valve (66). Air Release Key (67). Disilicate Stop Valve (68). Multi-Use Outlet (69). Pill Squeezer (70). Oppressor Disc (71). Oppressor Stop (72). Air Outlet for Pickup (73). DETAILED DESCRIPTION OF THE INVENTION QnfrZLn / iznz / e / YiAi The Dental Injection System (10) is a device with 5 levels housing its components. Each level is located in the following order, from top to bottom: Injection Section (20), Heat Section (30), Control Section (40), Motor Section (50), and Air Section (60). This order is ideal, but it can be interchanged and varied according to project needs. The Dental Injection System (10) is a rectangular prism-shaped device, although it can have other geometric shapes. Its vertical structure ideally consists of four support posts (11) at each corner; however, it can have additional vertical posts in other locations to support greater weight. Each level or section has a base (12) that supports the devices and equipment housed within it. Each corner of the base (12) connects to a support post (11).The Support Posts (11) must be of sufficient height so that the Bases (12) of the 5 sections can be fixed to the structure; the height of the Support Posts (11) can be greater than the total height from the lowest base to the highest base, i.e., the Support Posts (11) can extend below the Base (12) of the Air Section (60) becoming 4 legs of the structure where wheels can be placed for movement, and can also extend above the position of the Base (12) of the Injection Section (20). The Dental Injection System (10) is designed so that a Dental Muffle (21) is placed in the Injection Section (20) where the molten material is injected to give it the required shape, either manually or automatically. The Injection Section (20) of the Dental Injection System (10) is located at the top and is where a Dental Flange (21) is placed to receive the molten material for shaping; 2 Protective Goalposts (22) that help to cover and protect the flask; a Pressing Screw (23) that allows the Dental Flange (21) to be pressed onto the Base (12) of the Injection Section (20) so that the molten material enters the Dental Flange (21) and does not spill onto the Injection Section; a Screw Base (25) that serves to support the Pressing Screw (23); and an Anchor Post (24) that serves to lock the Screw Base (25) so that the Pressing Screw (32) can be positioned directly above the Dental Flange (21). The molten material entering the Dental Muffle (21) comes from the Heat Section (30) through the Injection Mouth (28). onfrZLn / Lznz / e / YiAi The Pressing Screw (23) has a rotating head and a flat Screw End (26) that presses the Dental Flange (21), mold, or injection pot. The two Protective Goalposts (22) consist of two walls located along the sides, but they can also be located at the front and back, leaving the sides free. The height of the Protective Goalposts (22) must be equal to that of the Screw Base (25) to ensure protection against impacts to the elements within the area delimited by the Protective Goalposts (22).The Protective Goals (22) have an Anchor Hole (220) at the top to one side of the center of the wall of the Protective Goal (22). The function of the Anchor Hole (220) is to insert the body of the Handle (35) after the injection process, since normally, once the material that was injected into the Dental Flange (21) cools, it causes said Dental Flange (21) and the Handle (35) to remain stuck together by residues of the cooled plastic. Therefore, to separate both pieces, the Handle (35) is inserted into the Anchor Hole (220) to use it as a lever and turn the Dental Flange (21) so that the plastic material that holds the pieces together breaks and allows their separation. The Screw Base (25) and the Anchor Post (24) are the same height and are both fixed to the Base (12) of the Injection Section (20) with a pedestal. The Screw Base (25) has a Bearing (27) on its upper part that allows it to rotate parallel to the surface of the Base (12) of the Injection Section (20), thus providing free access to the area where the Dental Flange is placed or allowing it to be positioned on the Dental Flange (20) to prepare the system for injection. The Screw Base (25) has a Screw Hole (221) in its body with an internal thread through which the Pressing Screw (32) is screwed in. When the Screw Base (25) is placed on the Dental Flange (20), the Pressing Screw (32) is screwed in until its Screw End (26) presses and immobilizes the Dental Flange (20). The Screw Base (25) also has an Anchor (29) that locks into the Anchor Post (24) to give stability to the Screw Base (25). The Heating Section (30) comprises a Heating Element (31), ideally cylindrical but of a different geometric shape, designed to generate sufficient heat to melt the material; a Thermocouple (32) measuring the temperature of the Heating Element (31); a Refractory Ceramic Bed (33) surrounding the Heating Element (31) retaining the heat generated by the Heating Element; a Barrel (34), ideally cylindrical, connected to the Injection Mouth of the Base (12) of the Injection Section (20); and a Handle (35) with a head and body of the same geometric shape as the Barrel but of a shorter height, designed to house the... QnfrZLn / iznz / e / YiAi the material to be heated; a Piston Stop (36) that is inserted through the Injection Mouth (28) and slides through the Barrel (34) until it is on top of the Piston (41), which has the function of pressing the molten material through the conduit of the Barrel (34) to carry out the injection process of the material towards the Dental Muffle (21); and an Injection Tube (37) which is cylindrical in shape and closed at its ends, is made of aluminum and contains inside the plastic material that is to be melted. The Control Section (40) has a Display (42) ideally on the front side which has the function of showing the temperature measurements of the Resistance (31), the air pressure of the Air Reservoir (61), and also configuring the operating parameters of the Dental Injection System (10); a Control Card (43) which stores the operating parameters and controls the actuation of the different elements of the Dental Injection System (10); an audible Alarm (44) which emits sounds to warn the user in cases where an event occurs that the control card detects; a Reset Button (45) which allows restoring all the initial or factory control parameters of the Dental Injection System (10). The Engine Section (50) has a Compression Engine (51) that feeds from the Air Tank (61) to maintain it at a specific pressure. Finally, the Air Section (60) has an Air Tank (61) that stores the pressurized air coming from the Compression Motor (51); a Solenoid Valve (62) controlled by the Control Board (43) that controls the flow of compressed air coming out of the Air Tank (61) and going to the Piston (41) to raise it when the injection process is carried out and lower it when it is finished; a Pressure Gauge (63) that measures the pressure of compressed air inside the Air Tank (61); a Pressure Gauge (65) that also measures the pressure inside the Air Tank (61) and that is connected to the control board to interpret the data and display it on the Screen (42);A safety valve (64) that is independently connected to the air tank (61) has a pressure limit configured to release air in case of a failure, thus preventing the air tank (61) from exceeding its permissible pressure limit. This safety valve (64) is not controlled by the control board (43) and is only activated by the air levels in the air tank (61). A purge valve (66) located at the bottom of the air tank (61) allows its contents to be released for maintenance. onfrZLn / Lznz / e / YiAi The Air Tank (61) has one inlet and several outlets; the air inlet comes from the Compression Motor (51) and allows it to be filled. The purge outlet has the Purge Valve (66) and is not connected to any other component; it is only used for maintaining the Air Tank (61). The Air Tank (61) has a connection on its upper part that allows it to receive air from the Motor (51). A Non-Return Valve (611) is located there, which allows air from the Motor (51) to flow into the Air Tank (61), but prevents compressed air from flowing back from the Air Tank (61) to the Motor (51). This Non-Return Valve (611) is used to protect the motor from damage caused by the return of compressed air. The Air Reservoir (61) has a Multi-Purpose Outlet (69) that is connected in series with the Disilicate Stop Valve (68), which is intended to have a pressurized air outlet to connect a pneumatic screwdriver that allows screwing and unscrewing the Dental Muffle (21), likewise, other dental cleaning devices that are frequently used and require pressurized air for their operation can be connected to the Multi-Purpose Outlet (69). The calibration of the compressed air inside the Air Tank is performed by validating the level of the Pressure Gauge (65) shown on the Screen (42) and the level of the Manometer (63). In case of any variation, a pressure compensation can be configured on the Screen (42) so that the parameters shown on the Screen (42) are the same as those of the Manometer (63). The Display (42) and the Control Board (43) are the two components responsible for controlling the Dental Injection System (10). The Control Board (43) contains the programming and electronic devices that send and receive signals from the components of the Dental Injection System (10). The Control Board (43) has an electrical connection to the Solenoid Valve (62), which activates or deactivates it, allowing compressed air from the Air Reservoir (61) to reach the Piston (41) to raise or lower it. The Control Board (43) also has electrical connections to the Heating Element (31), which activates or turns on the Heating Element (31) for the duration specified by the user via the Display (42). The Control Board (43) also has an electrical connection to the Thermocouple (32), which reads the temperature of the Heating Element (31) and displays it on the Display (42).The Control Board (43) has an electrical connection with the Reset Button (45), which, when activated by the user, will indicate to the Control Board (43) that the factory parameters should be reset; the Control Board (43) has an electrical connection with the audible Alarm (44) which is activated and emits a sound when the injection process has ended and also when the temperature of the Heating Element (31) has reached the one configured on the Display (42); the Control Board (43) has an electrical connection with a Pressure Gauge (65) located in the Air Tank (61) which has the function of measuring the air pressure of the Air Tank (61), so that its electrical signal is processed by the Control Board (43) and the pressure measurement is displayed on the Display (42);The Control Board (43) has an electrical connection to the Motor (51) that allows it to be switched on for the time necessary to generate air for the Air Tank (61) to maintain the air pressure required for its operation or at the parameter specified by the user. The air pressure parameters for the Air Tank (61) and the temperature of the Heating Element (31) can be saved on the Control Board (43) and can be configured, modified, changed, or updated later. The Screen (42) allows you to set the following parameters: the Resistance On Time (31), the Motor On Time (32) and Raise or Lower the Piston (41). The Dental Injection System (10) features an operating cycle called “Clean Barrel,” which the user activates to raise the piston (41) and expel any residue or leftover material remaining after injection. This process is controlled by the Control Board (43) and can only be performed when no injection is in progress. The following shows a method of operation of the Dental Injection System (10) to carry out the material injection process: 1. The Dental Injection System (10) is switched on using the Power Button (46). 2. The user must ensure that there is no residue inside the barrel by performing the “clean barrel” process and removing any residue that is expelled through the Injection Nozzle (28). 3. Through the Injection Mouth, the Piston Stop (36) is placed inside the Barrel (34), then the Handle (35) is placed and finally the Injection Tube (37) with the material to be injected is inserted into the Handle. 4. The Dental Flange (21) is placed in the Injection Section (20) just above the Injection Mouth (28). QnfrZLn / iznz / e / YiAi 5. The Screw Base (25) is turned until it is positioned over the Screw Hole (221) and the Pressing Screw (23) is screwed in until it presses against the Dental Flange (21) and immobilizes it. 6. According to the type of material, the user configures on the Screen (42), the temperature of the Resistance (31), the heating time. 7. When the injection cycle starts, the Heater maintains the set temperature and melts the material in the Injection Tube (37); during this process the Display (42) shows a countdown timer with the time remaining to complete the injection process. 8. When the heating time has been completed, the Control Card (43) actuates the Piston (41) through the Solenoid Valve (62) to rise through the Barrel (34) and with the force exerted pushes the molten material into the Injection Tube (37) and into the Dental Muffle (21). 9. Once the Control Card (43) lowers the Piston (41), it activates the Alarm (44) to emit a sound to indicate to the user that the injection has been completed. 10. Unscrew the Pressing Screw (23) and rotate the Screw Base (25) to release the Dental Flange (21), which is left to rest for a while to cool the material inside the Dental Flange (21) 11. If, when removing the Dental Flange (21), the Handle (35) remains attached, then the Handle is inserted into one of the Anchor Holes (220) to jam the Handle and turn the Flange (21), levering and thus detaching both elements. 12. The injection process is complete. The material has been injected into the dental flask. The Injection Tube (37) is ideally made of aluminum, which allows it to collapse easily without melting, so that with the pressure exerted by the Piston (41) the Injection Tube (37) breaks, which releases and pushes the melted plastic material towards the top where the Dental Muffle (21) is located. The injection parameters configured on the Display (42) can be saved on the Control Card (43) for future use. Another mode of operation of the Dental Injection System (10) is for the injection of lithium disilicate tablets, which uses only the Injection Section (20) and the Air Section (60). QnfrZLn / iznz / e / YiAi The Air Reservoir (61) has a pressurized air outlet called the Tablet Air Outlet (73). This air outlet is manually controlled by the Disilicate Valve (68). When the Disilicate Valve (68) is opened, pressurized air flows through the entire connection of the Tablet Air Outlet (73) to the Piston (62), allowing it to slowly rise to exert the necessary pressure through the Barrel (34) and inject the lithium disilicate tablets. When the lithium disilicate pellet injection process is complete, the Disilicate Valve (68) is closed to prevent pressurized air from circulating to the Piston (62), and the Air Release Valve (67) is then opened to release the air that remained in the pipe or hose, allowing the Piston (62) to descend to its original position. For the correct operation of this manual mechanism, a Tablet Press (70), ideally metallic, is used. At its upper end, it has a circular Press Disc (71) with a diameter larger than that of the Injection Mouth (28), although it can have a different geometric shape. At its lower end, it also has a cylindrical Press Stop (72). The Press Stop (72) is inserted through the Injection Mouth (28) and sits inside the Barrel (34). Once inserted, the lithium disilicate tablets and the mold where the tablets will be injected are placed on the Press Disc (71) of the Tablet Press (70). This mold must be held and pressed by the Pressing Screw (23), which will hold and keep the mold fixed.When the tablet injection process begins, the Disilicate Valve (68) is manually opened. This slowly and in a controlled manner raises the Piston (62), which in turn slowly raises the Tablet Press (70). This causes the Press Disc (71) to exert sufficient pressure to inject the lithium disilicate tablets into the mold or injection pot. In this manual operation, the Piston (62) is controlled by the Disilicate Valve (68) and the Air Release Valve (67). To raise the Piston (62), the Disilicate Valve (68) must be opened in a controlled manner so that the released air slowly raises the Piston (62) to the required height for injection.

Claims

1. A Dental Injection System (10) having an Injection Section (20) for a Dental Muffle (21), a Heat Section (30) for melting material, a Control Section (40) for setting pressure and temperature parameters, a Motor Section (50) for housing an air-generating motor, and an Air Section (60), characterized in that said System contains an Air Reservoir (61) integrated into the Air Section (60) and a Motor (51) integrated into the Motor Section (50), which provide pressurized air to drive a Piston that carries out the material injection.

2. The Dental Injection System (10) according to claim 1, characterized in that said system is a device in the form of a rectangular prism although it may have another geometric shape, with a vertical structure ideally made up of 4 Support Posts (11) at each corner, however, it may have more vertical posts in other locations to support an even greater weight.

3. The Dental Injection System (10) according to claim 1, characterized in that the Injection Section (20) has a space for placing a Dental Flange (21) that receives the molten material to give it shape, where said Dental Flange (21) is protected by 2 Protective Gates (22); a Pressing Screw (23) that allows pressing the Dental Flange (21), mold or injection pot onto the Base (12) of the Injection Section (20) so that the molten material enters inside the Dental Flange (21) and does not spill onto the Injection Section; a Screw Base (25) that has the function of supporting the Pressing Screw (23); and an Anchor Post (24) that has the function of locking the Screw Base (25) so that the Pressing Screw (32) can be located just above the Dental Flange (21).

4. The Dental Injection System (10) according to claims 1 and 3, characterized in that the 2 Protective Goalposts (22) consist of 2 walls ideally located along the lateral sides, but can also be located at the front and rear leaving the lateral sides free, the height of the Protective Goalposts (22) must be equal to that of the Screw Base (25) so that protection against impacts of the elements that remain within the area delimited by the Protective Goalposts (22) is ensured.

5. The Dental Injection System (10) according to claims 1 and 4, characterized in that the Protective Goalposts (22) have an Anchor Hole (220) on the upper part to one side of the center of the wall of the Protective Goalpost (22), which is used to insert the body of the Handle (35) after the injection process to use it as a lever and turn the Dental Flange (21) so that the plastic material holding the pieces together breaks and allows their separation.

6. The Dental Injection System (10) according to claims 1 and 3 above, characterized in that the Screw Base (25) and the Anchor Post (24) are of the same height and both are fixed with a pedestal to the Base (12) of the Injection Section (20).

7. The Dental Injection System (10) according to claims 3 and 6, characterized in that the Screw Base (25) has in its upper part a Bearing (27) that allows it to rotate parallel to the surface of the Base (12) of the Injection Section (20), thus allowing the area to leave free access to the area where the Dental Flange is placed or to be placed above the Dental Flange (20) to prepare the system for injection.

8. The Dental Injection System (10) according to claim 1, characterized in that the Heating Section (30) has a Heating Element (31) to generate heat to melt the material; a Thermocouple (32) whose function is to measure the temperature of the Heating Element (31); a Refractory Ceramic Bed (33) surrounding the Heating Element (31) and whose function is to maintain the heat generated by the Heating Element; a Barrel (34) ideally cylindrical in shape that is connected and attached to the Injection Mouth of the Base (12) of the Injection Section (20); a Handle (35) with a head and body of the same geometric shape as the Barrel but of a lower height and whose purpose is to house the material to be heated;a Piston Stop (36) that is inserted through the Injection Mouth (28) and slides through the Barrel (34) until it rests on top of the Piston (41), which has the function of pressing the molten material through the conduit of the Barrel (34) to carry out the process of QnfrZLn / iznz / e / YiAi injection of the material towards the Dental Muffle (21); and an Injection Tube (37) which is cylindrical in shape and closed at its ends, made of aluminum and which contains inside the plastic material to be melted.; 9. The Dental Injection System (10) according to claims 1 and 2, characterized in that the Control Section (40) has a Display (42) to show the temperature measurements of the Heating Element (31), the air pressure of the Air Reservoir (61), and also to configure the operating parameters of the Dental Injection System (10); a Control Card (43) that stores the operating parameters and also controls the actuation of the different elements of the Dental Injection System (10); an audible Alarm (44) that emits sounds to alert the user in cases where an event occurs that the control card detects; a Reset Button (45) that allows restoring all the initial or factory control parameters of the Dental Injection System (10); and a power button (46).

10. The Dental Injection System (10) according to claims 1 and 2, characterized in that the Motor Section (50) has a Compression Motor (51) that feeds from the Air Reservoir (61) to maintain it at a specific pressure.

11. The Dental Injection System (10) according to claims 1 and 2, characterized in that the Air Section (60) has an Air Reservoir (61) that stores the pressurized air coming from the Compression Motor (51); a Solenoid Valve (62) controlled by the Control Board (43) that controls the flow of compressed air coming out of the Air Reservoir (61) and directed to the Piston (41) to raise it when the injection process is carried out and lower it when the injection is not carried out; a Pressure Gauge (63) that measures the pressure of compressed air inside the Air Reservoir (61); a Pressure Gauge (65) that also measures the pressure inside the Air Reservoir (61) and that is connected to the Control Board (43) to interpret the data and display it on the Screen (42);and a connection at its top that allows it to receive air from the Motor (51) where a Non-Return Valve (611) is located, which in turn allows the passage of air from the Motor (51) to the Air Tank (61), but does not allow the passage of compressed air from the Air Tank (61) to the Motor (51). QnfrZLn / iznz / e / YiAi; 12. The Dental Injection System (10) according to claims 1, 2 and 11, characterized in that the Air Reservoir (61) has a Safety Valve (64) that allows air to be released from the Air Reservoir (61).

13. The Dental Injection System (10) according to claims 1, 2 and 11, characterized in that the Air Reservoir (61) has a Multi-Use Outlet (69) connected in series with the Disilicate Stop Valve (68), which is intended to have a pressurized air outlet to connect a pneumatic screwdriver that allows the Dental Muffle (21) to be screwed and unscrewed, or to connect dental cleaning devices that are frequently used and require pressurized air for their operation.

14. The Dental Injection System (10) according to claims 1, 2 and 11, characterized in that the Air Reservoir (61) has a pressurised air outlet called the Tablet Air Outlet (73) which is manually controlled by the Disilicate Valve (68), and when the Disilicate Valve (68) is opened it allows the pressurised air to circulate to the Piston (62) causing it to rise slowly, pressing the Tablet Press (70) ideally metallic which has a circular Press Disc (71) with a diameter larger than that of the Injection Mouth (28), to inject the lithium disilicate tablets with the pressure exerted slowly.

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