Piezoelectric Apparatus Research Articles

Case Report: Autogenous bone block grafting in esthetic zone for implant supported prosthetic rehabilitation

Background: Dental implants provide a novel method of successful treatment and have been a highly predictable surgical procedure for replacing single or multiple teeth. Maxillary anterior single-tooth replacement is often the most difficult procedure in all of implant dentistry. The highly esthetic zone of the premaxilla often requires both hard (bone and teeth) and soft tissue restoration. Therefore, augmentation of alveolar ridge defect becomes more important in terms of providing sufficient bone volume for the placement of implants and for aesthetic considerations. The aim of this case report was to bring forward the novel technique of combining ridge augmentation using autogenous bone block graft for anterior implant placement using piezoelectric apparatus. Case description: In this case report, a 27-year-old male patient presented to the department of periodontics with a chief complaint of poor aesthetics owing to missing tooth in the upper-front region (11) due to trauma that occurred 3 years back. The patient was diagnosed with an alveolar bone wall defect with 11 region. The authors brought forward the novel technique of combining ridge augmentation using autogenous bone block graft for anterior implant placement using piezoelectric apparatus in order to treat the patient. The follow-up was done at 6- and 9-months post-op respectively. Conclusion: In spite of all the technical difficulties that the surgical and restoring clinician may face, the anterior single-tooth implant is the ideal modality of choice to replace a missing anterior maxillary tooth. Clinical significance: Unique surgical and prosthetic concepts were implemented in this case for successful results.

Cervical ventral slot in rabbits (Oryctolagus cuniculus). Piezosurgery versus conventional technique.

ABSTRACTPurposeTo investigate the applicability of piezosurgery for cervical ventral slot (CVS), comparing it with the conventional technique of using high-speed burs for bone wear.MethodsThirty rabbits (Oryctolagus cuniculus) were divided into two treatment groups (T1 and T2) corresponding to CVS between C3-C4. In T1, the surgery was performed with piezoelectric apparatus, and in T2 with high-speed burs. The evaluated parameters were: duration of each stage of surgery, temperature variations during CVS, visibility of the surgical field, intra and postoperative complications, and anesthetic monitoring. At 14, 28, and 56 postoperative days, five animals from each treatment group were submitted for histopathological study of the surgical site.ResultsCompared with T2, T1 had more precise bone cut, and better visibility of the operative field, although it required longer total surgical time (p = 0.02) and triggered a greater number of intraoperative complications (p < 0.01), microscopic lesions in the spinal cord (p < 0.05), and transient neurological deficits in the postoperatively (p < 0.05).ConclusionsIt is necessary to perform surgical planning and have several tips of the piezoelectric instrument available for the safe use of the piezoelectric device in neurosurgery.

STANDING WAVE THERMOACOUSTIC PIEZOELECTRIC SYSTEM AND APPARATUS FOR GENERATING ELECTRICAL ENERGY FROM HEAT ENERGY

A standing wave thermoacoustic piezoelectric apparatus capable of generating electrical energy from heat energy is provided. The standing wave thermoacoustic piezoelectric apparatus includes a housing, a porous stack and a piezoelectric bimorph. The housing comprises a compressible fluid and has a first portion and a second portion. The second portion receives the heat energy from a heat source for creating a temperature gradient between the first portion and the second portion. A cold heat exchanger within the first portion is positioned at one end of the porous stack. The compressible fluid traverses between the first portion and the second portion through the porous stack to generate standing acoustic waves for generating acoustic energy. The piezoelectric bimorph positioned at an end of the first portion opposite to an end of the first portion having the cold heat exchanger, oscillates based on the acoustic energy for generating the electrical energy.

TRAVELLING WAVE THERMOACOUSTIC PIEZOELECTRIC SYSTEM FOR GENERATING ELECTRICAL ENERGY FROM HEAT ENERGY

A travelling wave thermoacoustic piezoelectric apparatus capable of generating electrical energy from heat energy is provided. The travelling wave thermoacoustic piezoelectric apparatus includes a hosing with two ends connected by an inertance component, a porous stack, a resonator, and a piezoelectric bimorph. The housing comprises a compressible fluid and has a first portion and a second portion. The first portion receives heat energy from a heat source for creating a temperature gradient between the first portion and the second portion. A cold heat exchanger within the second portion is positioned at one end of the porous stack. The compressible fluid traverses between the first portion and the second portion through the porous stack and the inertance component to generate travelling acoustic waves. The travelling acoustic waves resonate with the resonator for generating acoustic energy. The piezoelectric bimorph positioned at an end of the resonator opposite to an end of the resonator connected to the second portion, oscillates based on the acoustic energy for generating the electrical energy.

Energy shuttle based high energy piezoelectric apparatus and method

An energy harvester apparatus that includes a piezoelectric beam having opposing first and second ends, with the first end being fixedly supported to a support structure. A negative spring force subsystem has a first end fixedly secured against movement, and a second end secured to the second end of said piezoelectric beam. The negative spring force subsystem includes a linkage system and a biasing element operably associated with the linkage system for applying an adjustable, negative spring force to the piezoelectric beam to soften the piezoelectric beam. The negative spring force subsystem is adjusted to flex the beam sufficiently to overcome the inherent stiffness of the beam such that two stable positions for the beam are created. The beam is therefore able to oscillate between the two stable positions in an over center fashion in response to a low magnitude vibration signal. In various embodiments the system is implemented to provide an input drive signal to control various types of external devices.

Analysis of Dynamic Response for Piezoelectric Vibration Converter by Finite Element Simulation

The dynamic behavior of a vibration converter of an ultrasonic motor is described using finite element method. Tetrahedral finite elements with three dimensions are formulated with the effects of piezoelectric coupling. And the solution of the coupled electroelastic equations of dynamic motion is presented. The simulated response of the vibration converter is calculated, and shows excellent consistency with experimental results, which proved that finite element modeling is a good approach to optimize piezoelectric apparatus design. A gradual optimized method is employed to ascertain the most compatible structure.

Composite piezoelectric apparatus and method

The present invention relates to composite piezoelectric apparatus, transducers and methods of manufacture. In an embodiment, a composite piezoelectric apparatus has a sacrificial base and pillar array. Different volume percents of piezoelectric material are used in the sacrificial base and pillar array. A first volume percent in the base is lower than the second volume percent in the pillar array. In this way, the sacrificial base can be easily removed from the pillar array after the base and pillar array are sintered in the manufacture of a final composite piezoelectric transducer. A method of manufacturing a composite piezoelectric transducer from a sacrificial base and pillar array and a composite piezoelectric transducer made by the method are provided. A composite piezoelectric transducer stack is provided.