SOCO B4-7

For an inlay preparation, the dentist works on several faces of the same cavity. The B4-7 brings water to the bur through a passage in the body. The four outlets stay in position around the cutting instrument as the dentist turns from one cavity wall towards another. At the same time, the optical fibre brings light down to the head, close to the edge of the preparation.

The angle of approach becomes particularly relevant on a posterior tooth. To reach a surface facing the cheek or tongue, the dentist can present the bur to that surface while keeping the handle length on a different axis. The 45° geometry also applies when the patient is reclined. The fibre optic outlet follows the handpiece's movement, directing light toward the tooth as the dentist changes position.

When shaping a restoration, the dental team may need a different cutting profile from the one used during cavity preparation. The push button releases the first bur so the dentist can exchange it for a suitable finishing instrument. Both instruments use the same shank diameter. The cutting shape changes with the bur, while the coolant route through the handpiece stays in place.

At the chair, the drive speed and the bur speed describe two different points in the assembly. The gear train in the B4-7 links them at a fixed ratio. The output follows the motor speed through that gearing, so 168,000 rpm describes the upper end of the handpiece output across its rotary applications.

Coolant follows the handpiece.

Water reaches the head along an enclosed passage. Changing the working angle moves the outlets and the cutting instrument together.

Water distribution around the bur

Four openings deliver coolant to the head from different positions. The streams act around the rotating instrument where it meets the tooth.

Direct view of the preparation

The light guide terminates near the bur. It illuminates the same part of the tooth as the dentist moves the handpiece from one cavity wall to another.

An angled approach to posterior surfaces

The head's inclination lets the dentist aim the cutting tip toward a cheek- or tongue-facing surface. The handle can extend forward along a separate axis.

A known relation between motor and bur speed

The fixed transmission ratio connects the drive setting to the output. One motor turn produces 4.2 turns at the head.

Bur changes between restorative stages.

The operator uses the button to release a preparation bur and fit a finishing instrument. The change takes place at the head while the drive and water channel remain assembled.

One shank size for different profiles

The compatible shank size is 1.6 mm. A dental team can select a bur by the shape needed at the tooth and identify its fit by the dimension at the opposite end.

A water-only discharge at the tooth

The coolant leaving the four openings is water, with no air discharged into the working area. The micromotor provides the force that turns the bur.

Internal coolant passage

The water supply connects through the handpiece and runs inside its body to the angled head.

Four-point distribution

Four openings in the head direct the water towards the working bur. They are the delivery points for the internal channel.

Fixed head inclination

The head sets the cutting instrument at 45° to the handle. The operator changes its approach by repositioning the handpiece.

Optical fibre at the head

The light guide carries illumination along the body to the working end. Its outlet sits close to the tooth during preparation.

Speed-increasing gears

A 1:4.2 transmission sits between the motor and the chuck. The increase applies to the rotation delivered by the motor.

Maximum rotational output

At the bur, rotational speed reaches up to 168,000 rpm. A lower drive speed produces a correspondingly lower output.

Dental micromotor drive

SOCO specifies a compatible electric dental motor as the rotary drive. The B4-7 attachment receives and increases that rotation.

Bur shank interface

The chuck accommodates 1.6 mm turbine bur shanks. The diameter applies to the section held by the chuck.

Push-button chuck

The release button sits at the head of the handpiece. It operates the chuck when you exchange the cutting instrument.

Stainless steel body

The housing around the transmission is stainless steel. It extends from the micromotor connection to the handpiece neck.

Reinforced bearings

Bearings inside the handpiece support the rotating assembly. The B4-7 uses reinforced bearings in its drive construction.

Water-only outlet flow

The spray delivers water without discharging air at the tooth. Coolant delivery and mechanical rotation follow separate paths through the instrument.

The B4-7 suits a restorative team that uses an internally irrigated micromotor and wants water delivered at the working end during preparation and finishing. Its advantage is clearest when the dentist moves from one face of a posterior tooth to the next. The whole head moves, carrying the light outlet and the cooling streams with the bur. For a team moving from cavity cutting to restoration finishing, the chuck also makes instrument selection straightforward. The cutting profile can change with the task while the shank fit stays the same. The button releases a bur with a 1.6 mm shank.