Clinical case: full-arch maxillary dental prosthesis using the All-on-4® treatment concept

by on May 18, 2018
Posted in Implants

Study by: Dr. Ana Ferro

A 23-year-old patient with a severely degraded dentition came to the MALO CLINIC in Portugal, under its pro bono program. He had no oral hygiene habits and poor oral health. He had severe deterioration in the upper jaw, and in the lower jaw both quadrants’ molar teeth required extraction. His remaining teeth showed no sign of periodontal loss and/or mobility.

Full-arch rehabilitation of young patients is always demanding, not so much anatomically (e.g. reduced bone availability) but rather functionally and esthetically. Given the irreversible damage to most of his teeth and large apical lesions, we decided to perform full extractions, clean all granuloma lesions and treat the patient with implant surgery and Immediate Function.

We selected the All-on-4® treatment concept for this case since it is proven to be a predictable surgical option in the long-term1,2 and in demanding clinical situations.3 Use of the NobelParallel Conical Connection (CC) implants and the new Multi-unit Abutment Plus allowed us to deliver immediate, fixed rehabilitation even in the post-extraction sites – thus restoring the complete function of the upper jaw in one surgery.


Surgery was performed under local anesthesia. The procedure started with the extraction of the remaining teeth. A full-thickness flap was opened and elevated following a crestal incision and two releasing incisions in the first molar area. Through a photo showing the maximum smile line bone was reduced in order to hide the prosthetic transition, allowing for a more regular bone platform and a smooth gingival profile, making it easier for the patient to maintain after the surgery.

Implant surgery started with a mid-line osteotomy perpendicular to the bipupillary line, enabling the placement of the All-on-4® Guide.

Once the guide was in position and adapted to the maxilla’s size, the anterior wall of the sinus was identified in order to start placing the posterior implants as close to the cortical bone as possible, with an angulation of 45°. An under-preparation drilling protocol was used with the intention to achieve sufficient primary stability to allow for Immediate Function.

With the posterior implants stabilized and in position, the new Multi-unit Aligning Instrument was used to choose the most appropriate abutment angulation and prosthetic setting.


Anterior implant placement followed, also achieving adequate primary stability.

Suture and splinted impressions were then executed and the pre-made, all-acrylic bridge was then relined in the mouth and finalized in the lab. The patient returned to the clinic 10 days after the operation to remove the sutures and control the healing.


Despite the advanced deterioration of the upper jaw, the final result was very satisfactory for both the patient and myself.

The patient was able to immediately recover function and esthetics – which can be life-changing given the patient’s age – without having to go through additional, time-consuming and costly surgeries, instead benefiting immediately from this long-term predictable solution.

Top 5 tips

  1. Accurately extract the teeth and clean all the infections and granuloma tissue in order to make sure that your implants are placed in the best bone available.
  2. Use an underpreparation drilling sequence according to the bone density in order to achieve good primary stability.
  3. Use an implant that allows for bone condensation.
  4. Try to get bicortical anchorage in low-quality bone for better primary stability.
  5. Avoid delivering long cantilevers in the provisional all-acrylic prosthesis.


In this case the All-on-4® treatment concept allowed for immediate rehabilitation of function and esthetics. This patient had no need for additional surgeries such as bone grafting or sinus lifting. The All-on-4®treatment concept is time saving and cost efficient,4 while increasing patient satisfaction by providing immediate high esthetics5 and easy hygiene maintenance.6

This evidence-based treatment concept allows clinicians to effectively treat different types of patients and provide fast and predictable outcomes.7 The high implant and prosthetic survival rates of the All-on-4® treatment concept make it a predictable procedure for clinicians.1,2,7 I highly recommend that clinicians adopt this treatment concept in their daily practice, and avoid other demanding and time-consuming approaches.

The All-on-4® treatment concept is a team approach and I would like to thank all my MALO CLINIC colleagues involved in treating this patient: Ana Abadia (Oral Hygiene Department), Dr. João Botto (Oral Surgery Department), Dr. Raquel Lucas (Prosthodontic Department), Dr. Rodrigo Gonzalez (Prosthodontic Department) and Helena Alexandre (MALO CLINIC Ceramics Laboratory).

Why I use Nobel Biocare products

The manufacturer matters: the likelihood of predictable, long-term results is increased with the use of high-quality, original products from Nobel Biocare.8-11 All the products used in the present case were designed to work together as part of the All-on-4® treatment concept. In particular, by using the Multi-unit Aligning Instrument it was easier to identify the correct angulation for the abutment and adjust the implant position for the final Multi-unit Abutment placement. This reduces the need to make changes and substantially decreases chair time and discomfort for the patient. Together with appropriate training, these new products can help surgeons make the most out of the All-on-4® treatment concept.


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