In 1864 an engineer named Stephen Morse conceptualised the mechanical phenomenon stating that when two conical metal components (female + male) reach a tight contact, these fix one into the other, through a the so called “cold welding”. To obtain a real Morse effect, the conical sides of the components must not exceed a 5° overall inclination.

In the following years, this mechanism was widely employed in mechanical and industrial fields (lathes, milling machines…) and in prosthetic fields (orthopaedic and medical), to create and use modular components which necessitated a high structural stability.  

Implantology, which is a relatively recent branch in both medicine and therefore dentistry, employs these precision mechanical elements to build and consolidate dental reconstructions. For decades, dental implants with an external connection have been used in prosthetic surgeries, coherently with the instruments and knowledge of that time. The development and advancement of the industrial technology made it possible to adopt the hexagonal internal connection and later on the addition of a conical or a cone Morse connexion. Today this particular kind of product is increasingly used during successful placements of dental implants, both in case of a complete or single edentulous situation.

By exploiting the solidity granted by the Morse connection, it was possible to effectively answer to challenges and needs posed by implantologists. Namely, the need to preserve at their best peri-implant hard tissues, so that they can adequately support soft tissues and their optimal healing. 

Many clinical  and in vitro trials show that, at the time being, internal Morse connexion is the most efficient option amongst the ones on the market to perform successful implant surgeries, with long-lasting results thanks to its anti-bacterial action: 

(1) “Implants with an internal connection of the Morse taper type show lower levels of microleakage than those with an external connection regardless of the torque applied to tighten the screw, so they would be less likely to develop inflammation of the periodontal tissues, due to bacteria accumulation in the interface between the implant and the abutment”.

In summary:implant-abutment gap

  • The “cold welding” between the interface abutment/implant creates a hermetic seal thanks to its extra-tight friction, virtually eliminating the micro-gaps usually existing between both metal components. This prevents bacteria to spread and develop across the dento-gingival junction, minimising the probability of inflammatory processes insurgence. 
  • The firm mechanical stability reduces micro-movements, potentially very dangerous for the regenerating bone and the adjacent tissues.
  • The prosthetic structure sustained by an internal connection can tolerate greater chewing loads. 

conical hexagonal B&B connectionB&B Dental’s CONEXA connection is characterized by a cone Morse connection with an internal hexagonal index that allows a more accurate placing of the implants in the bone cavity, with significantly reduced traumas for the surrounding tissues.
These specific features promote an increased osseointegration, a higher level of bone and volumes regeneration, a healthy and solid gingiva once the healing process is completed. In this case, post-surgical complications immediately after the procedure and in the following years are drastically reduced so the patient won’t have to undergo an additional repairing surgery.

Clearly, post-surgery results must be as similar as possible to the patients’ natural dental state, regarding colour, looks, volumes. It is necessary to avoid the creation of gaps between the prosthesis and the abutment, between natural and rebuilt teeth, the gingiva must find the right conditions to easily heal.

B&B Dental builds its different lines of implants with the Morse connexion, called Conexa, because it recognises its advantages both for the clinician, who will operate with increased security, and for the patient, who will experience a faster and untroubled healing process.

B&B Dental production is entirely Made in Italy, abutments and implants are realised in a complementary way, in the same production plant. This guarantees the absolute compatibility of the components and their high-level quality, in compliance with international requirements.


Larrucea Verdugo C, Jaramillo Nu´ n˜ ez G, Acevedo Avila A, Larrucea San Martı´n C. Microleakage of the prosthetic abutment/implant interface with internal and external connection. In vitro study. Clin. Oral Impl. Res. 25, 2014, 1078–1083 doi: 10.1111/clr.12217

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