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What are the complete clinical requirements, maintenance protocols, and component logistics for Locator Fixed?

Locator Fixed is a clinician-removable fixed prosthetic solution that bridges the gap between traditional overdentures and All-on-X cases. Successful outcomes require meeting specific clinical requirements upfront, following a defined maintenance schedule, using the correct tooling, and sourcing components through proper channels. Below is the complete reference.

Minimum Clinical Requirements

Every Locator Fixed case must meet these baseline criteria before proceeding:

Requirement Specification
Implants Minimum of 4 implants
Angulation Each implant within 20° divergence (gold legacy abutment only)
VDO (per lab manual) 9–11mm minimum; 10–12mm preferred; 9mm workable but challenging
Removability Clinician removable only (NOT patient removable)

Contraindications

Locator Fixed is not appropriate when any of the following are present:

  1. Fewer than 4 implants available
  2. VDO below 9mm
  3. Implants outside the 20° angulation range (which would require a gold abutment)

VDO Management in Challenging Cases

Scenario Approach
Limited VDO (9–10mm) May need to "steal" space from the opposing arch if possible
Natural dentition opposing Cannot steal space from an upper arch with natural teeth
Patient expectations Set realistic expectations early when VDO is limited
Overall planning Each overdenture conversion is unique and requires individual assessment

How Locator Fixed Differs From All-on-X

Specification Locator Fixed All-on-X
VDO requirement 10–12mm 15mm+
AP spread Less More
Cantilever ratio (non-bruxer) 1:1 Typically larger
Cantilever ratio (bruxer) 1:0.5 Typically larger
Patient acceptance of cantilever limits High (removable-mindset patients) Higher expectations

Locator Fixed vs. Removable Locator: Technology Differences

The Locator Fixed system uses different materials and movement characteristics than the standard removable Locator system. Understanding these differences is essential for maintenance planning.

Aspect Removable Locator Locator Fixed
Insert material Nylon (squishy, soft) PEAK (rigid)
Insert function Daily in/out, multiple wear cycles No pivoting, minimal movement
Manufacturing Standard production Housing and insert made on the same machine for precise fit
Critical limitation Nylon inserts replaced periodically PEAK inserts distort when removed and never regain the same retention. Replace every time the prosthesis is removed

Maintenance Schedule

Timeframe Recommended Recall
First year after delivery Every 6 months (twice per year)
After the first year Once per year minimum
Bare minimum (any case) GP visits twice yearly for oral cancer screening, OHI, prosthesis evaluation, and implant assessment

Required Tooling

Locator Fixed maintenance requires specific tools the clinician must own and have on hand.

Tool Function / Notes
Seating/removal tool Handle with seat and removal ends, similar to crown and bridge removers. Removal end goes underneath the cantilever.
Sound/vibration during use Makes noise but is less aggressive than it sounds
New core tool Required for PEAK inserts. Older core tools are too thin and lack stability
Ownership Clinician purchases and owns the tools for ongoing maintenance

Component Availability and Sourcing

Component Type Current Source
Locator Fixed inserts, housings, tooling Direct from ZEST (lab does not stock these)
Coordination Contact your ZEST representative for delivery
Future state Direct partnership being developed between ZEST and the lab
Removable Locator components Available through Preat (third-party vendor)
Fixed components and angled locators Not offered through some distributors

Workflow and Cement Options

Workflow Choice Detail
Lab processing Available with ZEST component coordination
Office processing Available using the pickup method
Cement selection Must match the prosthetic material. Contact the lab for guidance

Bottom Line

Locator Fixed delivers a fixed-prosthesis outcome on as few as 4 implants with less VDO and AP spread than All-on-X, making it the right call when those parameters are met. Long-term success depends on adhering to the recall schedule, replacing PEAK inserts at every removal, owning the correct tooling, and sourcing components directly through ZEST.

Additional Resources

For more information concerning the ZEST Locator Fixed:

Contact Information

For help with a Locator Fixed solution for your next case, contact ROE Dental Laboratory: