A Four-Year Survival Rate Multicenter Prospective Clinical Study on 377 Implants: Correlations Between Implant Insertion Torque, Diameter, and Bone Quality

The purpose of this study was to evaluate the survival rate and incidence of prosthetic complications in 377 implants with a double octagon connection. Furthermore, the correlations among implant dimensions (diameter and length), bone quality, and insertion torque were investigated. A 4-year multicenter prospective clinical study was designed to evaluate the survival rate of 377 dental implants inserted in 189 patients between January 2004 and April 2010. After an average follow-up of 46 months, the implant survival rate was 99.7%, and the incidence of complication was 0.53%. Moreover, insertion torque was statistically related in a significant way to implant diameter. The connection system seemed to reduce the risk that the prosthetic component screw would loosen. Within the limits of this study, it was observed that a wider diameter corresponded to a higher implant primary stability. Implant length did not seem to be critical in obtaining higher primary stability.

Download Full-text

The success of immediate implant placement with Zero insertion torque

10.21203/rs.2.17167/v1 ◽

2019 ◽

Author(s):

Samy Aboelyazied Elian

Keyword(s):

Survival Rate ◽

Key Words ◽

Primary Stability ◽

Insertion Torque ◽

Torque Measurement ◽

Implant Survival ◽

Maxillary Bone ◽

Implant Placement ◽

Immediate Implant

Abstract Background The primary stability in immediate implant placement was considered one of the prerequisites for the achievement of good osseointgration. The insertion torque varies between cases depending on many factors and may goes down to Zero that may affect the prognosis of the implant especially in the soft maxillary bone. The aim of the study was to assess clinically the success&/or failure of immediate flapless implant placement in the maxilla with Zero insertion torque measurement with a follow up time ranging 2-4 years. Results: out of 780 analyzed, fourteen implants were placed in fresh extraction sockets for single rooted teeth in the maxilla and did not get primary stability (zero insertion torque). Their survival rate was 85.7%. Conclusions: The loss of torque during immediate implant placement to Zero may jeopardize the survival of the implants, but it may not be statistically significant with their failure and loss. The lack of certain conditions that are absent during their surgical installation and healing have the major effects on success. The implant primary stability is not an absolute prerequisite to osseointegration; however, it may affect the implant survival rate. Key words: 0 torque implant insertion, implant primary stability, loose implant, immediate implant survival, immediate implant placement.

Download Full-text

Influence of Bone Quality, Drilling Protocol, Implant Diameter/Length on Primary Stability: An In Vitro Comparative Study on Insertion Torque and Resonance Frequency Analysis

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-19-00145 ◽

2020 ◽

Vol 46 (3) ◽

pp. 182-189 ◽

Cited By ~ 1

Author(s):

Davide Farronato ◽

Mattia Manfredini ◽

Michele Stocchero ◽

Mattia Caccia ◽

Lorenzo Azzi ◽

...

Keyword(s):

Resonance Frequency ◽

Bone Quality ◽

Frequency Analysis ◽

Primary Stability ◽

Mean Difference ◽

Insertion Torque ◽

Resonance Frequency Analysis ◽

Bone Response ◽

Implant Length

The aim of this study was to evaluate the influence of bone quality, drilling technique, implant diameter, and implant length on insertion torque (IT) and resonance frequency analysis (RFA) of a prototype-tapered implant with knife-edge threads. The investigators hypothesized that IT would be affected by variations in bone quality and drilling protocol, whereas RFA would be less influenced by such variables. The investigators implemented an in vitro experiment in which a prototype implant was inserted with different testing conditions into rigid polyurethane foam blocks. The independent variables were: bone quality, drilling protocol, implant diameter, and implant length. Group A implants were inserted with a conventional drilling protocol, whereas Group B implants were inserted with an undersized drilling protocol. Values of IT and RFA were measured at implant installation. IT and RFA values were significantly correlated (Pearson correlation coefficient: 0.54). A multivariable analysis showed a strong model. Higher IT values were associated with drilling protocol B vs A (mean difference: 71.7 Ncm), implant length (3.6 Ncm increase per mm in length), and substrate density (0.199 Ncm increase per mg/cm3 in density). Higher RFA values were associated with drilling protocol B vs A (mean difference: 3.9), implant length (1.0 increase per mm in length), and substrate density (0.032 increase per mg/cm3 in density). Implant diameter was not associated with RFA or IT. Within the limitations of an in vitro study, the results of this study suggest that the studied implant can achieve good level of primary stability in terms of IT and RFA. A strong correlation was found between values of IT and RFA. Both parameters are influenced by the drilling protocol, implant length, and substrate density. Further studies are required to investigate the clinical response in primary stability and marginal bone response.

Download Full-text

5-year follow-up of a prospective clinical study on various types of core restorations

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2005.05.013 ◽

2005 ◽

Vol 94 (4) ◽

pp. 403 ◽

Cited By ~ 10

Author(s):

N.H. Creugers ◽

A.G. Mentink ◽

W.A. Fokkinga ◽

C.M. Kreulen

Keyword(s):

Clinical Study ◽

Prospective Clinical Study

Download Full-text

The Effect of Q-Switched Nd:YAG 1064 nm/532 nm Laser in the Treatment of Onychomycosis In Vivo

Dermatology Research and Practice ◽

10.1155/2013/379725 ◽

2013 ◽

Vol 2013 ◽

pp. 1-10 ◽

Cited By ~ 23

Author(s):

Kostas Kalokasidis ◽

Meltem Onder ◽

Myrto-Georgia Trakatelli ◽

Bertrand Richert ◽

Klaus Fritz

Keyword(s):

Clinical Study ◽

Treatment Time ◽

Prospective Clinical Study ◽

Self Evaluation ◽

Time Period ◽

Level Of Satisfaction ◽

Before And After ◽

532 Nm

In this prospective clinical study, the Q-Switched Nd:YAG 1064 nm/532 nm laser (Light Age, Inc., Somerset, NJ, USA) was used on 131 onychomycosis subjects (94 females, 37 males; ages 18 to 68 years). Mycotic cultures were taken and fungus types were detected. The laser protocol included two sessions with a one-month interval. Treatment duration was approximately 15 minutes per session and patients were observed over a 3-month time period. Laser fluencies of 14 J/cm2were applied at 9 billionths of a second pulse duration and at 5 Hz frequency. Follow-up was performed at 3 months with mycological cultures. Before and after digital photographs were taken. Adverse effects were recorded and all participants completed “self-evaluation questionnaires” rating their level of satisfaction. All subjects were well satisfied with the treatments, there were no noticeable side effects, and no significant differences were found treating men versus women. At the 3-month follow-up 95.42% of the patients were laboratory mycologically cured of fungal infection. This clinical study demonstrates that fungal nail infections can be effectively and safely treated with Q-Switched Nd:YAG 1064 nm/532 nm laser. It can also be combined with systemic oral antifungals providing more limited treatment time.

Download Full-text

How Do Parameters of Implant Primary Stability Correspond with CT-Evaluated Bone Quality in the Posterior Maxilla? A Correlation Analysis

Materials ◽

10.3390/ma14020270 ◽

2021 ◽

Vol 14 (2) ◽

pp. 270

Author(s):

Ji-Hyun Kim ◽

Young-Jun Lim ◽

Bongju Kim ◽

Jungwon Lee

Keyword(s):

Bone Density ◽

Bone Quality ◽

Objective Assessment ◽

Primary Stability ◽

Insertion Torque ◽

Hounsfield Units ◽

Stability Parameters ◽

Posterior Maxilla ◽

Different Types ◽

Edentulous Patients

The aim of the present study was to evaluate correlations between bone density and implant primary stability, considering various determinants such as age, gender, and geometry of implants (design, diameter). Bone density of edentulous posterior maxillae was assessed by computed tomography (CT)-derived Hounsfield units, and implant primary stability values were measured with insertion torque and resonance frequency analysis (RFA). A total of 60 implants in 30 partially edentulous patients were evaluated in the posterior maxilla with two different types of dental implants. The bone density evaluated by CT-derived Hounsfield units showed a significant correlation with primary stability parameters. The bone quality was more influenced by gender rather than age, and the type of implant was insignificant when determining primary stability. Such results imply that primary stability parameters can be used for objective assessment of bone quality, allowing surgical modifications especially in sites suspected of poor bone quality.

Download Full-text