Scientifica implantology

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.

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.

XXXVII Convegno Nazionale, AIAS Associazione Italiana per l?Analisi delle Sollecitazioni, 10-13 settembre 2008, Università di Roma la Sapienza, Abstract collection

A complete prosthetic system (jaw-fi xture-prosthesis) was evaluated with the FEM to parameterise the effectiveness of three different Toronto structures on Global implants. The result shows how the choice of different implant sizes, the distribution of the fi xture spaces and sizes of the superstructure have a direct impact on the effectiveness of the distribution of prosthetic loads and mechanical stress.

Minerva Stomatologica, 57(4):167-79, 2008

This extensive clinical study compared the result of the screwed prosthesis and cement-retained prosthesis in numerous case reports of implant lines available on the market. The type of prosthetic solution did not infl uence in a statistically signifi cant manner the osseointegration of implants at 34 months, which was good in both cases.

Minerva Stomatologica, 57(4):167-79, 2008

This extensive clinical study compared the result of the screwed prosthesis and cement-retained prosthesis in numerous case reports of implant lines available on the market. The type of prosthetic solution did not infl uence in a statistically signifi cant manner the osseointegration of implants at 34 months, which was good in both cases.

Implant Dentistry, 2014, 23(6): 665-671

A mechanical study on cyclic fatigue stress in accordance with the UNI EN ISO 14801: 2008 was carried out on 3.8 x 13 mm Premium implants, simulating worst-case conditions. The implants showed excellent capacities of resistance to the loads applied, and are suitable for rehabilitations in both frontal and molar sectors.

Medicina Oral, Patología Oral y Cirugía Bucal 2015; 20(1):e94-102

The strength and deformation of posts of different types screwed onto Kohno implants and subjected to static loads was evaluated. Rotational or repositionable posts made entirely in titanium showed greater resistance to deformation than posts with a titanium base and a resin sleeve, normally used for overcasting, and in this study considered as temporary fittings.

Implant Dentistry, Volume 22, Number 3 2013

In the last years many studies have highlighted the brilliant results of both immediate implants and immediate loading of implants. A natural evolution of these studies is the possibility to insert implants immediately after the extraction and to perform after this the prosthetic restoration. This concerns not only the replacement of a single tooth, but also a full arch restoration. The matter of indications to extraction should be analyzed in-depth on the evidence of the modern knowledge, evaluating very carefully the role of implants in treatment plans.
This kind of approach involves an accurate analysis of connection systems between implants and prosthetic superstructures with the aim to simplify the procedures and to optimize the passivity in the adaptation of the prosthesis. Premium/Kohno implants present a connection characterized by an internal hexagon and an external collar: this connection allows a minimal solicitation of the fixation screw, but it doesn’t help in creating a structure passively adaptable directly onto the implant platform in presence of minimal disparallelisms. To ease the procedure a simplified post was created, named “Simple”, where the hexagon was substituted by a small cylindrical portion which helps in centering and stabilizing the post inside the collar of the implant. The resistance of the Simple post towards functional solicitations was tested: the resistance of the implant-post joint was analyzed in presence of this kind of connection compared with three different variations. They were: the standard Premium/Kohno configuration, the connection with internal hexagon (without external collar) and another connection with traditional external hexagon. Finite
element method test was used to perform this analysis. The following connection hypothesis were compared:
• Case 1: COLLEX connection, internal hexagon + external collar, the one of Premium/Kohno implants;
• Case 2: Hypothetical connection with the traditional internal hexagon (without external collar);
• Case 3: Premium/Kohno implant connected with a Simple post (the post presents a cylindrical portion which helps centering and stabilizing the post itself inside the implant connection);
• Case 4: Standard external hexagon connection.
It is evidenced by the results that the use of a flat post connection, associated to a cylindrical portion which helps stabilizing itself inside the implant connection, doesn’t influence particularly the characteristics of the joint; this kind of connection presents values very near to the ones of the standard Premium/Kohno connection, thus supporting the use of this type of prosthesis, when it is necessary to connect a screwed prosthesis on many elements often disparallel between them.

This study documents the properties of strength of the COLLEX connection, present on Premium, Kohno and Shelta implants. COLLEX showed values 25% higher in terms of prosthetic robustness and stability compared to a connection with an internal hexagon but without a collar.