ALL-ON-X IMPLANT
If the bone allows, we first look at a three-segment fixed prosthesis, in which only the affected segment can be repaired, and choose a single-piece All-on-X depending on placement constraints, cost, and your preference.
All-on-X
A full-arch implant (All-on-X) is a method of placing 4-6 implants in one jaw and fixing 12 artificial teeth as a single-piece prosthesis, whereas our full-mouth implant (three-segment fixed prosthesis) places enough implants to divide the 12 artificial teeth into three segments. If the bone allows, Yeonhap Dental Clinic first considers a three-segment fixed prosthesis, in which only the segment with a problem can be repaired or replaced, and chooses All-on-X depending on placement constraints, cost, maintenance, and the patient's wishes. The number and positions are our clinic's design criteria.
CT Planning
At the first consultation, we look at the three items below on 3D CT and decide which is right for you, a three-segment fixed prosthesis or All-on-X.
Two Cases
The bone at the molar sites, the front tooth sites, and the provisional prosthesis conditions common to both methods.
If the bone above the nerve canal at the molar sites is under 5 mm, we leave those sites empty and place implants at the four front sites where bone remains and make the 12 artificial teeth as a single piece. Behind the last implant, two molars are extended on each side, and we check the length and bite, and No. 7 (the second large molar) is not made.
If implants can be placed at the front tooth sites, we first look at a three-segment fixed prosthesis (at least 7). If placement at the front tooth sites is difficult, we place implants at six sites toward the molars on both sides and attach the 12 artificial teeth as a single piece, and a sinus lift is often done together.
If the lower jaw has 4 and the upper jaw has 6 implants with a diameter of 4 mm or more, a length of 8.5 mm or more, and an initial stability of 30 Ncm or more, and the connection design is suitable, we attach a provisional prosthesis within the same day to 1 week. About 90% of Yeonhap Dental Clinic's lower-jaw full-mouth cases qualified.
Why Not Everyone
We do not choose by number alone. We look together at the extent of repair, cleaning, bone graft, cost, and the method you prefer.
Because the All-on-X prosthesis is a single piece, depending on the extent, the whole prosthesis may have to be removed for repair, whereas with a three-segment fixed prosthesis only the segment with a problem is repaired or replaced. With both methods, cleaning under the prosthesis is important, and every 6 months we check for loose screws, the bite, and peri-implantitis.
It is hard to compare the total cost by the number of implants alone. We compare with a three-segment fixed prosthesis by adding the number of prosthesis segments, bone graft and sinus lift, extent of repair and maintenance, and the method you prefer, and if you want to reduce cost, we consider All-on-X for both jaws.
Before Visit
Bring them if you have them. If not, we will calculate from CT on the first day.
Design criteria: All-on-4 with 4 implants in the lower jaw (#32, #34, #42, #44), All-on-6 with 6 in the upper jaw, and a three-segment prosthesis with at least 6 in the lower jaw and at least 7 in the upper jaw (based on 12 artificial teeth). When we consider All-on-X: when the bone above the nerve canal at the lower-jaw molar sites is under 5 mm, when placement at the upper-jaw front tooth sites is difficult, or when you want to reduce cost. Even if the bone allows, you can choose All-on-4 if you prefer, and even if four sites are available, you can choose an implant-supported denture depending on NHI coverage conditions. Provisional prosthesis: For an upper jaw where a sinus lift is done together, we do not attach a provisional prosthesis immediately. If the conditions are not met, we repair and adjust your existing denture or use a new temporary denture, and the provisional bridge after the second-stage surgery also depends on your condition. Immediate loading is meant to reduce the discomfort of waiting. Timeline: We expect about 4 months from placement to the final prosthesis for the lower jaw and about 4-8 months for the upper jaw. If a sinus lift is done first, we explain the total timeline separately, and the details are in the timeline guide and the sinus lift guide.
The number and positions of implants and the provisional prosthesis specifications are Yeonhap Dental Clinic's standards. We referred to the literature for the All-on-4 treatment concept (Soto-Peñaloza 2017) and the initial stability conditions for immediate loading of a full arch (Gallucci 2014). The figure of about 90% for the lower jaw is from Yeonhap Dental Clinic's full-mouth case experience, and NHI coverage follows the Health Insurance Review and Assessment Service notice and Ministry of Health and Welfare announcements. For this reason, at the first consultation Yeonhap Dental Clinic first looks at the bone at the molar sites and the front tooth sites on CT. References: Soto-Peñaloza 2017, systematic review of the All-on-4 treatment concept · Gallucci 2014, consensus statement on implant loading protocols · Health Insurance Review and Assessment Service, recognition criteria for dental implants (Notice No. 2025-23) · Ministry of Health and Welfare, results of the Sept. 8, 2026 Health Insurance Policy Deliberation Committee (expanded dental coverage) Treatment results may vary depending on each person's oral condition. The applicable methods and course of healing vary from person to person depending on the remaining bone and general health.
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