SOCO B4-7S

When a dentist approaches a molar with the patient reclined, they must accommodate the length of the handpiece in front of the mouth. The B4-7S gives the bur a different line of approach from the handle. The dentist can hold the body forward while directing the tip towards a surface further back. At the same time, the optical fibre brings light to the head, where the tooth and the bur meet.

In dental surgery, the distinction between head angle and illumination matters most when the dentist moves from one tooth surface to another. The 45° angle determines where the tip can point for a given handle position. The light follows the head through that movement. At the working end, the dentist can see the bur in relation to the tooth while the handle occupies a different part of the field.

For motor-driven cutting, the relationship between the drive and the bur matters as much as the approach. A change at the motor changes the speed at the tooth through the fixed gear ratio. The external line serves a separate purpose during cutting. Its four outlets aim water at the rotating instrument from around the head, keeping the coolant close to the point of use.

When changing cutting profiles, the dental team uses the same chuck and release button. The shank diameter remains 1.6 mm even when the cutting tip shape changes. Once another compatible bur is in place, the head keeps the same angle, and the optical outlet stays in position beside the bur.

A line of approach to the molars

The bend at the head separates the bur's direction from the handle's direction. That geometry gives the dentist room to hold the instrument forward while approaching a back tooth.

Light that moves with the working end

The optical outlet sits at the head. When the dentist turns the handpiece to face another part of the tooth, the light moves with the instrument.

Coolant at the bur

Four outlets around the head bring water to the cutting end. The external connection supplies those outlets through a dedicated route alongside the neck.

Water-only spray

Irrigation reaches the bur as water without an air discharge at the operating site. The drive supplies rotation separately through the gear train.

Predictable relation between input and output

For every motor revolution, the bur makes 4.2 revolutions. That fixed relationship lets a dentist distinguish a motor setting from the resulting speed at the cutting end.

Bur exchange at the head

The release button acts directly on the chuck. Changing the cutting instrument between tasks leaves the angled head, fibre and irrigation connection in place.

A defined shank fit

A team organising burs for this handpiece can group compatible instruments by their 1.6 mm shank diameter. The working tips can have different profiles while the part held by the chuck has the same diameter.

Access with the patient reclined.

With the patient lying back, the dentist can direct the tip towards the molar region while viewing the working area beside the head. Both the angle of approach and the light outlet travel with the handpiece.

Fixed 45° head

The head is inclined at 45° to the body. This sets the bur's direction relative to the dentist's grip.

Fibre optic illumination

An optical fibre conveys light through the handpiece. Light emerges near the cutting end.

Speed-increasing transmission

The gearing multiplies the rotational input by 4.2. The motor supplies the input, and the chuck carries the output to the bur.

Maximum bur speed

The output reaches up to 168,000 rpm. Actual rotational speed depends on the motor input.

External irrigation inlet

The water connection runs alongside the neck of the B4-7S. It feeds the head outlets from an external supply.

Four spray outlets

The head distributes water to four points around the bur. These streams cool the working end.

Water-only discharge

The spray delivers its coolant without expelling air at the tip. The water path and the mechanical drive have distinct roles.

Push-button release

A button on the rear face of the head controls the chuck. Pressing it releases the bur shank.

Chuck for 1.6 mm shanks

The chuck holds the cylindrical shank of a compatible dental bur. Its 1.6 mm diameter specification applies to that interface.

Stainless steel body

The handpiece has a stainless steel body. It houses the drive between the motor connection and the inclined head.

Motor-driven operation

The B4-7S takes rotary input from a compatible dental motor. SOCO also identifies compatible motor-driven dental surgical units as a drive source.

Replaceable cutting instrument

The bur is the exchangeable cutting component. The optical fibre, water inlet and chuck all remain part of the handpiece when the bur changes.

The B4-7S suits a dental team whose main concern is approaching a back tooth with the patient reclined. The dentist can hold the instrument forward and set the bur against the tooth along a different axis. Light arrives beside that bur, so changing the approach also repositions the illumination. For a practice using an external irrigation supply, the water route is another reason to choose this configuration. The line connects beside the neck and feeds four outlets at the head. For the team preparing the next cutting instrument, the deciding dimension is the shank that the chuck holds. It measures 1.6 mm.