I agree with Mark that it is a good idea to have product liability. A Dental Laboratory Policy should start at $500 and go up depending on the type of risk ($ to be covered for building & contents, type and location of building you are operating in) A good Dental Laboratory Policy should include:
Product Liability
Professional Liability
General Liability (which is what the landlord is looking for)
Building Coverage (if you own the Building: $ value to replace the building)
Contents Coverage (to replace your equipment, inventory, and build outs-Replacement cost: $ value to replace everything inside)
Extra Coverages included in the Business Owners Policy include: Business Interruption, Off Premise Utility, Cases in Transit, Precious Metals
Additional Coverages for a Dental Laboratory to consider:
Workers Compensation: States might require you to have Workers Compensation Coverage for Employees
Commercial Auto: if you are using the auto for business related driving
Umbrella: Goes over your liability coverages
Employment Practices Liability Coverage