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Therapy for Missing Lower Medial Incisor by Means of Reduced Diameter Implants

S ince Branemark first described the principle of osseointegration in the field of dentistry, dental implantology has become a rapidly evolving and innovative field. In 2004, the American Dental Association Council on Scientific Affairs cited dental implants as the ‘‘first generation of tissue engineering devices that will affect the dental profession.’’ Accordingly, a wide variety of implant materials, shapes, sizes, and surface treatments have been devised. Patients have become aware of the potential of dental implants; prostheses that function immediately are often desired. To meet this demand, implants of increasingly smaller diameter have been devised, and singlestage procedures with immediate functional loading have become available. Small-diameter implants (SDIs) are the preferred treatment modality in cases of limited anatomic geography. These implants range from 2.75–3.3 mm in width and from 8.0–15.0 mm in length. Specifically, SDIs are indicated for replacement of teeth with small cervical diameters and in cases of reduced interradicular bone. They also have been shown to be a viable alternative to bone augmentation when poor alveolar ridge width is encountered and in cases of restricted mesiodistal anatomy. Based on this in vivo and in vitro success, the mini dental implant (MDI) seems a logical successor. Smaller than their SDI counterparts, MDIs have diameters ranging from 1.8– 2.4 mm. MDIs were initially designed for temporary prosthetic stabilization during the healing phase of standard implants. Reproducible success in this indication has led to expanded use in orthodontic anchorage, for the temporary fixation of transplanted teeth, in periodontal therapy, and, more recently, for long-term fixed and removable prosthetics. Although the Sendax MDI (3M ESPE, OsseoSOURCE, St Paul, Minn) was the first MDI to gain approval from the U.S. Food and Drug Administration for long-term applications, several other MDI systems are available, including Hi Tec Implants (Hi Tec Implants, Herzlia, Israel) and Monorail MTI 1 Private dental practice, DEIMPERIO, LLC, Bratislava, Slovak Republic. 2 Department of Stomatology and Maxillofacial Surgery of the Faculty of Medicine, Comenius University and Oncologic Institute of St Elisabeth, Bratislava, Slovak Republic. 3 Private dental practice, DENTALNE CENTRUM, LLC, Trnava, Slovak Republic. 4 Private dental practice, Eurodent Medima, LLC, Martin, Slovak Republic. * Corresponding author, e-mail: richard.jurkovic@chello.sk DOI: 10.1563/AAID-JOI-D-09-00138 CASE LETTER

Multicentric retrospective clinical study on the clinical application of mini implant system

Introduction: Mini-implant system is applicable to areas of narrow space and area requiring temporary loading support. The purpose of this st udy was to evaluate the clinical outcome of a mini-implant system as well as the application of mini-implant system in the dental c linical field. Materials and Methods: The patients who had been operated from Jan 2007 to Dec 2007 in the four dental facility including Seoul National University Bundang Hospital were enrolled. To evaluate the factors associated with the clinical outcome, the patients were clas sified according to gen- der, age, area of surgery, type of implant, diameter and length of the implant, and the purpose of the mini-implant system appl ication. Results: From 147 implants, only three implants failed, one of them was for temporary loading. There were no serious surgical or prosthe tic compli- cations in this study. Conclusion: An analysis of the preliminary data revealed a satisfactory clinical outcome. However, more long-term evaluation of narrow ridg e type as well as the patient' s satisfaction on the use of a provisional type mini-implant system is needed.

解体建物における床サポート本数の合理化の提案

Bending moment of the slab caused by a load of a heavy machine under demolition work is usually defined less than allowable moment for temporary loading. The number and arrangement of tube supports are determined to meet the condition. If the plastic deformation of a slab is estimated with accuracy, the reasonable floor support system can be proposed. In this report, the results of measured axial forces of the supports in a 2 way slab are described, and the reasonable support system is proposed.

Effect of loading on recovery of internal friction of Al-16 Wt % Ag and Al-16 Wt % Ag-0.28 Wt % Fe alloys

The phenomenon of internal friction recovery of Al-16 wt %Ag and Al-16 wt %Ag-0.28 wt % Fe alloys is studied after cold-working the samples in uniaxial tension using the free decay method. The wire samples are investigated for internal friction recovery while they were loaded-within the elastic limit-by different loads at different resting temperatures. It is found that by increasing the temporary loading the rate of recovery decreases. TEM investigations confirmed that the addition of Fe to Al-Ag alloy accelerates the formation and coarsening of G.P.zones. The results are explained on the basis of dislocation damping adopting the Granato-Lucke model for recovery of internal friction.

Clinical evaluation of single-tooth mini-implant restorations: A five-year retrospective study

Statement of Problem: Placement of small diameter implants often provides a solution to space problems in implant restoration. Analysis of the success of this type of implant restoration has not been clearly determined. Purpose: This 5-year retrospective study presents results from 52 mini-implants for single-tooth restorations placed in 44 patients from 1992 to 1994. Material and Methods: Dental records of 44 patients with 52 mini-implants placed during 1992-94 were reviewed. The implants were all placed by the same surgeon and the single-tooth custom screwed posts with cemented crowns were positioned on the implants by the same prosthodontist. Results: The results achieved by the mini-implant rehabilitation were similar to those reported for standard single-tooth implant restoration. Total implant survival rate was 94.2%. Two implants were lost at second stage surgery, and another was lost after temporary loading. Conclusion: The results suggest that single-tooth mini-implant restoration can be a successful treatment alternative to solve both functional and esthetic problems. They may represent the preferred choice in cases where space problems limit the use of standard or wide diameter implants. (J Prosthet Dent 2000;84:50-4.)

Optimization of the optical output in a C-to-C pulsed gas laser

An investigation of the optimum condition for maximum optical output in a C-to-C pulsed gas laser (N/sub 2/ laser) showed that this condition does not happen when the two capacitances are equal (C/sub 1/=C/sub 2/) as this happens in the Doubling circuit case, but when the peaking capacitance obtains a critical value. This behavior is attributed to the electric pumping pulse formed by the temporary loading of the peaking capacitor. This electric pumping pulse increases as the peaking capacitor increases. However, for low values of the peaking capacitor the optical output follows the rise of the electric pumping pulse. On the other hand, for higher values of the peaking capacitor than a critical one, a part of the electric energy arrives at the laser channel after the laser output, while the exploitable electric energy decreases causing reduction of the optical output. >

Thermal Protection of Induction Motors Enhanced by Interactive Electrical and Thermal Models

Models are of interest to application engineers because they identify important electrical, thermal, and mechanical interactions in an induction motor. They provide a format for the parameters which must be obtained. The loading and terminal conditions can then be specified and the model state equations used to obtain the thermal limit curves and, what is more important, the time solution for current, torque, speed, and the temperatures of the rotor and stator. Adequate protection of induction motors is routinely achieved via locked-rotor, phase unbalance, and overload protection. However, conditions of changing load torque, frequent starts, temporary phase unbalance and high inertia loading must often be tolerated. Designing protective schemes for these conditions using conventional relays is difficult and sometimes impossible. Motor protection is primarily a temperature estimation problem. Recognizing that good electrical and thermal models exist leads to their adoption for motor protection so that the heating and cooling process is well represented for virtually all loading and terminal conditions. This paper first reviews electrical, thermal, and mechanical models. Their parameters are discussed and a novel technique is introduced for accommodating the frequency dependent skin effect of the rotor resistance using a simple speed estimation algorithm. The correlation with protection practice is established by using the models to obtain the thermal limit curves for a motor including the relatively recent rotor accelerating time limit. The models are then used to analyze conditions of locked rotor, high inertia starting and overload torque.

New technique of weak soil consolidation with temporary loading and sand drains : SVETINSKI, EV STROGANOV, AS In Russian. MOSCOW. NAUCH. ISSLED. INST. OSNOV. PODZEM. SOORUZHEN. TRUDY, V65, 1975, P237–241

New technique of weak soil consolidation with temporary loading and sand drains : SVETINSKI, EV STROGANOV, AS In Russian. MOSCOW. NAUCH. ISSLED. INST. OSNOV. PODZEM. SOORUZHEN. TRUDY, V65, 1975, P237–241

213 短期応力を対象とするはりハンチの配筋効果に関する実験的研究(その4) : 鉄筋コンクリート架構接合部に関する研究 第13報(構造)

213 短期応力を対象とするはりハンチの配筋効果に関する実験的研究(その4) : 鉄筋コンクリート架構接合部に関する研究 第13報(構造)