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Visionstar SJD-C21

✓ Certified Professional Seller

Visionstar Dental And Oral Care Equipment

Visionstar SJD-C21

Product Code: DAOC-DI-2866

Seventy kilovolts on a ten-centimetre spacer. Resolve that first.

One figure needs settling before anything else. The Visionstar SJD-C21 publishes 70 kV alongside a 10 cm focus-skin distance, with a DG-073B-DC tube, a 2.5 kg body and a remote release included.

Sections

Intraoral X-ray Units

Categories

Dental And Oral Care Equipment

Condition

New

Origin

China

Seller Type

Certified Professional Seller

Size:

215 × 140 × 160 mm

CE & ISO Certified

Global Shipping

Supplier: Medigear

The Visionstar SJD-C21 is a battery-powered dental X-ray generator weighing 2.5 kg and measuring 215 × 140 × 160 mm. It operates at 70 kV and 2 mA through a high-frequency switching circuit at 30 kHz, rated at 60 W, with exposure regulated by microprocessor and timing from 0.1 to 1.8 seconds. The tube is described as a bipolar fixed insert, model DG-073B-DC, with a 0.3 mm focus point, a 21° target angle and 8.5 kHU anode heating capacity. Radiation leakage is published at under 20 µGy/h, and exposure can be triggered from the mainframe, from the head tube or from an included remote control.

One published figure has to be dealt with before any of the rest matters. UK dental guidance sets a minimum distance from the focal spot to the patient's skin, and that minimum steps up for equipment operating above 60 kV — commonly expressed as 100 mm at 60 kV and below, and 200 mm above it. This unit is specified at 70 kV, which places it in the higher band, and the published focus-skin distance is 10 cm.

Those two figures do not sit together: the supplied spacer delivers the distance associated with the lower band while the tube operates in the higher one. There are only a few ways it resolves — a longer spacer or cone is available and should be specified at order, output can be restricted to 60 kV, or one of the published figures is wrong. Establish which before committing to a purchase.

Total filtration is stated at 1.6 mm aluminium, above the 1.5 mm equivalent minimum commonly cited for sets up to 70 kV, though the component figures given for origin and additional filtration do not sum to that total and need reconciling. The irradiation range is published at 73 mm round, which is a larger number than the beam diameter UK guidance permits at the patient's skin, so the measurement basis needs establishing too.

Medigear.uk can arrange for all of these points to be put to the manufacturer with your quotation, alongside supply, delivery, commissioning, staff familiarisation and service cover for the SJD-C21 across the United Kingdom.

Intraoral radiography carries the diagnostic load in UK general dentistry, and the SJD-C21 is configured for that daily volume. It supports bitewing caries detection, periapical assessment of pathology, endodontic working-length and obturation verification, alveolar bone-level review, and root morphology assessment ahead of extraction, with 30 × 40 mm film among the compatible media alongside digital sensors.

Operation at 70 kV produces a long greyscale, which suits views where crestal bone, root surface and restorative material must be read from a single image — periodontal review and restorative margin assessment both draw on that. It also reaches a given receptor density in a shorter exposure.

The installation picture requires work before any clinical benefit is realised. The published focus-skin distance corresponds to the lower kilovoltage band while the tube is specified in the higher one, and the published field diameter exceeds what UK guidance permits at the skin. Both are procurement questions that determine whether the unit can be commissioned in its supplied configuration.

The included remote release is a genuine working advantage for practices taking a high daily volume, since operator dose falls with distance and a remote trigger gives the operator a real choice of standing position — exercised within the arrangement their Radiation Protection Adviser has assessed.

Community dental services and special care teams need equipment one clinician can carry. At 2.5 kg, the unit travels, with off-site radiation protection arrangements agreed with the RPA in advance.

Guidance from the College of General Dentistry and UKHSA Dental X-ray Protection Services remains the reference point that UK practices work to, alongside HSE enforcement of IRR17.

A remote release for operator distance

Exposure can be triggered from the mainframe, the head tube, or an included remote control. Operator dose falls with distance, so a remote trigger gives a real choice of standing position within the assessed arrangement.

Electronically regulated exposure

Microprocessor control and a high-frequency switching circuit hold tube voltage close to constant through the exposure, producing comparable receptor density between visits and supporting serial comparison.

Low published leakage

Housing leakage under 20 µGy/h is stated, giving your Radiation Protection Adviser a definite figure when assessing controlled area and operator position.

Filtration above the cited minimum

A stated total of 1.6 mm aluminium sits above the 1.5 mm equivalent minimum commonly cited for sets operating up to 70 kV, once the component breakdown has been reconciled.

Thermal capacity for consecutive exposures

An 8.5 kHU anode rating gives practices running multi-view sessions something definite to plan against, with duty cycle the follow-up question for the manufacturer.

A long greyscale from 70 kV

Higher beam energy spreads a broad range of densities across the image, which suits periodontal bone-level review and restorative margin assessment.

Carried by one clinician

At 2.5 kg and 215 × 140 × 160 mm, the unit sits within single-person handling for a full list or a community round.

Specification conflicts identified before order

Focus-skin distance against kilovoltage, field diameter, filtration arithmetic, tube identity and whether settings are adjustable all need written answers. Medigear.uk can arrange for each to be put to the manufacturer with your quotation, so your Radiation Protection Adviser sees them before any commitment.

Included remote control

Exposure can be triggered remotely as well as from the mainframe or head tube, supporting operator position within the assessed arrangement.

Microprocessor exposure control

Exposure is regulated electronically rather than by mechanical timing, supporting consistency between successive exposures.

High-frequency switching at 30 kHz.

Switching supply holding tube voltage close to constant through the exposure, with a 60 W power rating.

70 kV tube voltage

Fixed kilovoltage above the 60 kV threshold, producing a long greyscale and determining which minimum focus-skin distance applies.

2 mA tube current

Published tube current, with exposure time as the variable setting the exposure product for each region and receptor type.

DG-073B-DC bipolar fixed tube

The technical table identifies the insert by model; confirm in writing which tube is actually fitted, as the feature text gives a different description.

0.3 mm focus point

Published focal spot size; the specification governing penumbra and therefore edge definition at the receptor.

21° target angle

Published anode target angle, influencing the effective focal spot at the receptor and the intensity distribution across the field.

8.5 kHU anode heating capacity

Published thermal rating governing how many exposures can be taken in close succession; request the joule equivalent and cooling curve.

1.6 mm Al total filtration

Published total above the minimum commonly cited for sets up to 70 kV; component figures require reconciling with the manufacturer.

10 cm focus-skin distance

Published distance corresponding to the band applying at 60 kV and below; resolve against the 70 kV specification before order.

73 mm round irradiation range

Published field dimension — establish the measurement distance and the diameter at the skin, and specify additional collimation if required.

DC 16.8 V, 2600 mA battery

An integrated pack charged from a 220 V / 110 V, 50/60 Hz supply.

215 × 140 × 160 mm at 2.5 kg

Published dimensions and weight are the figures that determine storage arrangements and single-person handling.

The Visionstar SJD-C21 gives UK dental teams a 2.5 kg battery-powered X-ray generator running 70 kV and 2 mA through a microprocessor-controlled high-frequency switching circuit at 30 kHz, with a DG-073B-DC bipolar fixed tube, a 0.3 mm focus point, a 21° target angle, 8.5 kHU anode capacity, published total filtration of 1.6 mm aluminium, leakage under 20 µGy/h and an included remote release. Before it can be considered for a UK practice, the relationship between its 70 kV specification and its published 10 cm focus-skin distance has to be resolved, along with the field diameter, the filtration breakdown and the tube identity. Medigear.uk can arrange for each of those points to be put to the manufacturer in writing with your quotation, so your Radiation Protection Adviser can reach a view before any commitment, alongside supply, delivery, commissioning, staff familiarisation, service cover and planned maintenance across the United Kingdom. Contact the Medigear.uk team for pricing, lead times, spacer options and configuration enquiries.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

It is the first thing to resolve, and it should be resolved before ordering rather than at commissioning. UK dental guidance applies a minimum focus-to-skin distance that steps up above 60 kV, commonly given as 100 mm at 60 kV and below and 200 mm above it. A unit specified at 70 kV sits in the higher band, and the published 10 cm figure corresponds to the lower one. Ask the manufacturer three questions: is a longer spacer or cone available, can output be restricted to 60 kV, and is either published figure in error. Then give the answers to your Radiation Protection Adviser and let them determine whether the unit can be used as supplied.

That also needs confirming. The irradiation range is published at 73 mm round, and UK guidance limits the beam diameter where it meets the patient's skin, commonly expressed as 60 mm for a round field. Ask at what distance along the beam the 73 mm is measured, since a figure quoted at the cone exit and one quoted at skin are different measurements, and ask what the diameter is at the skin with the supplied spacer. Where it exceeds the permitted maximum, additional collimation is required and should be specified at order.

The data sheet gives a total of 1.6 mm aluminium alongside origin and additional component figures that sum to a different number. The stated total sits above the minimum commonly cited for sets operating up to 70 kV, so the headline position looks sound, but a Radiation Protection Adviser needs figures that agree with one another. Request the corrected breakdown in writing, and treat the half-value layer measured at critical examination as the deciding check.

The technical table identifies a bipolar fixed insert, model DG-073B-DC, while the feature text describes a Toshiba micro-focus tube. Those are not the same description, and the tube model is what your Radiation Protection Adviser and service engineer key beam quality data, expected test results and replacement parts off. Ask for written confirmation of the insert actually fitted, and request its datasheet.

The feature text refers to adjustable kV and mA while the technical table gives single values of 70 kV and 2 mA. Whether the operator can vary those settings changes how your Medical Physics Expert writes exposure protocols and what your local diagnostic reference levels look like, so it is not a detail to leave open. Confirm the available settings, and if they are adjustable, confirm the range and the increments.

It gives the operator freedom to choose their standing position during the exposure, within whatever arrangement their Radiation Protection Adviser has assessed. Operator dose falls with distance, so on a unit intended to be held, that flexibility is worth having designed in. It does not remove the backscatter shielding question, and it is not a substitute for the assessed arrangement — use it inside your local rules rather than in place of them.

Published leakage of under 20 µGy/h describes radiation escaping the tube housing in directions other than the useful beam. It is a housing measurement, separate from operator scatter dose during an exposure, which depends on technique, receptor, collimation, shielding and operator position. Your Radiation Protection Adviser uses it when assessing the controlled area, and measures the doses that actually apply in your surgery.

The Ionising Radiations Regulations 2017 require employers carrying out dental X-ray work to register with the Health and Safety Executive, appoint a Radiation Protection Adviser, nominate a Radiation Protection Supervisor and complete a radiation risk assessment. The Ionising Radiation (Medical Exposure) Regulations 2017 add the appointment of a Medical Physics Expert, justification and optimisation of each exposure, and documented training for referrers, practitioners and operators. A critical examination is required when the equipment is put into service.

Dental X-ray equipment is subject to routine quality assurance and periodic radiological testing under IRR17, alongside annual electro-mechanical inspection, with a critical examination required at installation. UK service providers commonly apply an annual radiological testing interval to hand-carried units. Warranty terms are set and issued by the seller or manufacturer, typically 12–24 months for this equipment class — confirm the term, the parts covered and the battery position at quotation.