Scientifica implantology

Numeri Uno 12; 2012, 12-13

In November 2009 a patient came to us who had previously been treated in March 2009 with positioning of implants in the lower arch. The male patient, aged 48 and a non-smoker, asked us if we could replace his old “mobile job”, a removable partial denture that he had been wearing for years, with a fixed prosthesis. Specifically he asked us, in a short period of time, to replace the two incisors (11 and 21) and the first left upper premolar (24), therefore asking for a fixed prosthesis with the lowest possible cost. The objective examination showed considerable crestal reabsorption in zones 11 and 21, both horizontal and vertical, compensated by the resin part of his removable denture. Dyschromia was also noted, loss of enamel and old fillings on the lateral incisors 11 and 22. The need to rehabilitate a zone of such high aesthetic value while trying to keep down the costs led us to choose the following treatment: 2 Kohno implants by Sweden & Martina with screwed composite crowns, direct facets in composite material on the laterals and implant on 24. This choice will be extremely advantageous as regards both the economic aspect and the healing times.

Clinical Oral Implant Research, 2012; 23 Suppl 6: 163-201

The 3rd Consensus Conference of the EAO (15-18 February, Pfäffikon, Switzerland) dealt systematically with the results of screw-retained versus cemented prostheses. Summing up the data:
- Only works with a 5-year survival were included
- 59 studies (38 prospective and 12 retrospective) responded to the criteria for inclusion out of the 4511 analysed.
The other works were discarded because they did not contain sufficient information about the type of prosthesis (screw-retained or cemented) and/or they analysed exclusively the survival but not the complications.
- Results: at 5 years cemented single crowns presented a higher survival rate and distinctly less complications than screw-retained single crowns, screw-retained bridges had a survival rate comparable to that of cemented bridges but less complications, cemented full-arch FDPs showed a higher survival rate than screw-retained ones, but in this case there was an enormous difference in the number of specimens examined for the two types, so the statistical models used are not necessarily an objective indication of the clinical result.

International Journal of Oral and Maxillofacial Implants, 2012; 27: 138-145

Interesting review of the ability of platform switching to preserve periimplant tissues. The works included in the review allow it to be said that the protocols are effective in preserving marginal bone. However, other factors may contribute to this result, for example the apico-coronal position of the implant, the different implant surfaces and the extent of mismatching of the switching platform.

Italian Dental Journal, 2011

IMMEDIATE LOADING OF AN EDENTULOUS MANDIBULAR CREST WITH SIMPLE TECHNIQUE

This interesting clinical case is an excellent example of the use of SIMPLE posts in immediate load in a mandibular arch, illustrating its ease of use and practicality.

Rassegna Odontotecnica, 9: 33-48, 2000

Journal of Prosthodontics, 19(8):614-619, 2010

Resistance to wear of four matrices with ball attachments for implant overdentures: a fatigue study. This study was conducted by the Department of Dental Prosthesis of the University of Florence and examined the wear resistance and retention force of four different types of ball attachments for implantretained overdentures with the use of an in-vitro fatigue test simulating 5500 cycles of insertion and removal. Dimensional changes of the ball attachments were investigated with a profi lometer. The
matrices used were a Tefl on matrix (with metal housing), a titanium matrix, a gold alloy matrix and an o-ring for medium retention.
The Tefl on matrices showed an increase of 27% in retention at 5500 cycles, remaining relatively stable up to 5500 cycles, while the titanium matrices and o-ring matrices exhibited progressive loss of retention up to 68% and 75% at 5500 cycles. The dimensional analysis by profi lometer revealed signifi cant wear on the ball attachment only for the titanium matrices.
Therefore, it can be stated that the gold alloy and Tefl on attachments showed the highest retention values without retention loss after 3 years of simulated function (equal to approximately 5500 cycles).

An interesting cyclic fatigue study that showed how the gold alloy and Tefl on matrices for ball attachments maintained a higher retentive capacity than the titanium matrices over time. The study also demonstrated greater wear of the ball heads of the attachments when used with titanium matrices.

The Journal of Implants and Advanced Dentistry, 2(9): 41-58, 2010

This finite element analysis suggests that a Toronto prosthesis is capable of better distributing the stress on six fixtures, rather than on five, and that it is always advisable to position two implants intraforaminally and instead of only one implant.

Minerva Stomatologica, 58(1-2):9-23, 2009

This study analyses the load effects of the masticatory cycles on a Toronto prosthesis on Global implants and suggests that the position, angle and size of the implants are determining factors for the long-term success of the prosthesis in relation to the anatomy of the receiving bone.

NumeriUno, 8, 04-05, 2009

In this clinical case, the single-model technique allowed rehabilitating the patient with one surgery and a minimal number of sessions for finalising the screwed prosthesis, obtained with the CAD-CAM Echo protocol on Kohno implants.

NumeriUno, 8, 04-05, 2009

In this clinical case, the single-model technique allowed rehabilitating the patient with one surgery and a minimal number of sessions for finalising the screwed prosthesis, obtained with the CAD-CAM Echo protocol on Kohno implants.