Optimum selection of the dental implant diameter
The thickness of the 3.5mm diameter of KISPLANT is wider compare to that of other companies.
However, the replacement of a single premolar with the 3.5mm implant has a risk of fracture after 4-5 years (the same rule goes for Straumann, Osstem and Dentium).
So, here is a guideline for dental implant diameter selection:
Implant size selection depends on the tooth numbering of upper and lower jaws
1. #4 and #5: The 4.0mm is ideal as the 3.5mm diameter is too small
2. #6 and #7: The 4.5mm is ideal as the 4.0mm diameter is too small
3. #6 and #7: Do not use the 4.0 mm diameter for a single tooth implant. If there are more than 2 implants in the same area then due to space restrictions then the 4.0mm diameter is possible.
Implant size selection in general
1. 3.0mm: When replacing a single tooth implant among 4 incisors in the lower jaw. (with a crown of course)
2. 3.5mm: Restrict the use of this diameter to Maxillary lateral incisor & 4 mandibular anterior teeth. Their use should be avoided for maxillary anterior and all posterior teeth. A single crown is possible
3. 4.0mm: #1,3,4,5 in the upper jaw & #3,4,5 in the lower jaw. A single crown is possible
4. 4.5mm above: Molars on the upper and lower jaws. Must use the 4.5mm diameter or wider
Implant size selection by case - multiple unit replacement
1. Molars in the upper and lower jaws (2 units-bridge): Two 4.0 mm diameter implants is possible
2. Molars in the upper and lower jaws (3 units-bridge) : Using two 4.0 mm diameter implants is advisable otherwise at least one 4.5mm diameter implant must be used
3. Single premolar: Use the 4.0mm diameter above
4. Two premolars on a bridge: The 3.5mm diameter implant is possible
5. 4 incisors in the lower jaw and a 4-unit bridge: Two 3.5mm diameter implants
6. 4 incisors in the upper jaw and a 4-unit bridge: It depends on the occlusion length of bridge, if the forces of occlusion is less, the two 4.0mm implants are ideal however the two 3.5mm implants can be used too
Note 1: If the above guidelines are not followed, the head of fixture would be at risk of fracture
Note 2: The above guidelines are effected by the bone quality and implant length