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Results for “DENTAL IMPLANTATION”

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At least 1,207 records · Page 67Linked to original sources
PubMedDate not supplied

Insertion torque and resonance frequency analysis of dental implant systems in an animal model with loaded implants.

PURPOSE: The aim of this study was to compare insertion torque and resonance frequency analysis of different implant systems in an animal model with loaded implants. MATERIALS AND METHODS: Three types of Brånemark implants (machined MkIII, TiUnite MkIII, and MkIV) and 2 types of Straumann implants (sandblasted, large-grit, acid-etched [SLA] and titanium plasma-sprayed [TPS]) were studied. Thirty-two implants of each type (n = 160) were placed in 16 beagle dogs. Maximum insertion torque values were recorded. After a healing period of 8 weeks, the implants were loaded for 3 months; the animals were then sacrificed. At placement, after healing, and at the end of the loading phase, resonance frequency analysis was performed and implant stability quotients (ISQs) were recorded. RESULTS: Higher insertion torque values were seen for the conical MkIV than for the MkIII. No difference was seen between the Brånemark and Straumann implants on the basis of ISQ value at placement. ISQ and insertion torque values were lower for the cylindric Straumann implants than for the self-tapping implants. For all implant systems a significant decrease in median ISQ was observed, with a median decrease ranging from 3 to 6. ISQ values for self-tapping implants remained stable after loading, whereas the ISQ values for non-self-tapping cylinders decreased. The maximum insertion torque values for failed and successful implants were not significantly different. Significantly higher ISQ values at placement were seen for successful implants (P =.003). Based on this model for ISQ, a threshold of 65.5 was identified, with a sensitivity of 83% and specificity of 61% for prediction of implant loss. ISQ values at the start of loading were not predictive of implant loss in the loading period. CONCLUSION: Caution should be used when judging implant systems on the basis of resonance frequency analysis and torque measurement.

Animals↗
PubMed1992

Use of bovine osteogenic protein to promote rapid osseointegration of endosseous dental implants.

An enriched bovine osteogenic protein preparation in combination with bone collagen matrix (osteogenic protein device) was used to effect new bone growth in extraction sites in the presence or absence of titanium dental implants. Incisor and canine teeth were extracted from each of three cynomolgus monkeys, and implants were inserted directly into the sockets without surgical site preparation. The osteogenic protein device induced new bone formation in close apposition to the titanium implants in all trials within 3 weeks. A lesser amount of new bone formation in both sets of control sites was limited to the bony socket walls and not closely apposed to the implant. These data show that the osteogenic protein device is capable of inducing new bone formation in tooth sockets within 3 weeks in the presence or absence of titanium implants. This is the first known demonstration of the therapeutic induction of bone formation in close apposition to metallic implants.

Animals↗
PubMed2004

Endoscopic removal of a dental implant displaced into the maxillary sinus: technical note.

Minimal invasive endoscopic surgery has been developed for various indications in the cranio-maxillofacial area. In this article, a technique for endoscopic removal of a dental implant displaced into the maxillary sinus is presented. Access to the implant was achieved transorally via the canine fossa. The implant was captured and removed using a urological retrieval basket through the endoscopic working channel port. The endoscopic surgical approach described was reliable and minimally invasive for removing dental materials displaced into the maxillary sinus.

Adult↗
PubMedDate not supplied

[Changes in the immune system of patients with dental implants made of different materials].

To assess the immune system status, the authors have measured various lymphocyte populations, whose ratio was determined in indirect immunofluorescence with Ortho or BL monoclonal antibodies, CD3, CD4, CD8, and DR-specific. The detected shifts in the immunity system permitted dividing the patients into 3 groups: Group 1 consisting of subjects with moderate immunity depression, Group 2 including those with moderate immunity stimulation, and Group 3 comprising patients with poorly manifest changes in the immunity system. The authors recommend carrying out analyses of the immunity system before and after implantation surgery, for such analyses may help predict possible complications and improve therapeutic correction thereof.

Adult↗
PubMed1991

Release of metal ions from dental implant materials in vivo: determination of Al, Co, Cr, Mo, Ni, V, and Ti in organ tissue.

Little is known of the release of trace elements in vivo from dental implant materials. Conflicting data have been reported in the literature as to the levels of trace elements released and their potential consequences, mainly because of sampling and analytical methodological errors. In this study methods for average concentration levels of Al, Cr, Co, Mo, Ni, Ti, and V in organs were developed using rabbit tissue from an in vivo implantation study. At least 50% of the brain, liver, lung, kidney, and spleen were taken minimizing contamination. The tissue was homogenized by cryogenic milling at LN2 temperature and then freeze-dried. Samples were digested in nitric acid and hydrogen peroxide using microwave energy. Standard reference materials were utilized for quality control. One liver sample was analyzed 10 times to assess the method precision. Absorbance values in blanks, standards, and test samples were measured using a Varian GTA 95 graphite furnace and 875 spectrophotometer. Very satisfactory method precision and quality control were recorded. Low or very low levels of the trace elements were found in the various organs.

Alloys↗
PubMedDate not supplied

Reconstruction of the severely resorbed maxilla with dental implants in the augmented maxillary sinus: a 5-year clinical investigation.

The aim of this investigation was to determine the long-term clinical outcome and predictability of the maxillary sinus augmentation procedure utilizing a variety of bone augmentation materials. The augmentation materials evaluated were a xenograft alone (Bio-Oss), an alloplast alone (Interpore), a xenograft-alloplast combination (Bio-Oss mixed with Interpore in a 1:1 ratio), an alloplast (Interpore) mixed with autogenous bone from the iliac crest (in a 1:3 ratio), and an alloplast (Interpore) mixed with autogenous bone from the chin (in a 1:1 ratio). A total of 340 plasma-sprayed cylinder implants (IMZ) were placed, either simultaneously with the sinus augmentation procedure (235 implants), or 6 months after the procedure (105 implants) in 133 patients with insufficient bone volume in the posterior maxilla. The implants were restored with a total of 151 fixed detachable ceramometal prostheses and evaluated up to a 5-year period. Clinical evaluations included yearly assessments of peri-implant inflammation, implant mobility, and clinical attachment levels. Radiographs were also taken prior to sinus augmentation surgery, at abutment connection, at completion of the restoration, and thereafter at yearly intervals. All of the implants placed into the augmented sinuses achieved osseointegration. Only four implants (1.2%) failed to maintain osseointegration after prosthesis placement, yielding an implant survival rate of 98.8% during the entire course of the study. Of the 340 implants, 307 (90.3%) were considered successful according to the success criteria used. Gender, implant length and location, remaining bone height, and type of bone augmentation material had no effect on implant success. None of the 151 prostheses was lost during the observation period. The results of this study support the long-term clinical predictability of maxillary sinus augmentation procedures for the rehabilitation of the edentulous posterior maxilla with implant-supported prostheses.

Adult↗
PubMed2001

Bone volume collected from dental implant sites during osteotomy.

PURPOSE: Little research has been done to determine the amount of bone harvested from implant site preparations using an inline bone collector. This study looked at the amount of bone that can be harvested from common dental implant osteotomies. PATIENTS AND METHODS: A total of 24 implants were placed in 9 patients over a 3-month period. Implant size ranged from 3.75 x 13 mm to 4.75 x 13 mm. Nine implants were placed in the maxilla, and 15 implants were placed in the mandible. Seven patients were female, and 2 patients were male. The patient age ranged from 27 to 72 years. Four patients had implants placed within 5 years after tooth extraction, and 5 patients had implants placed 5 years after tooth extraction: an analysis of variance was used to determine if there were statistical differences between maxilla versus mandible, male versus female, and edentulism less than or greater than 5 years. RESULTS: The average bone volume from the 24 osteotomies was 0.195 +/- 0.099 mL. The average osteotomy site measured 4.02 x 12.90 mm. There were no statistical differences noted among maxilla and mandible, gender, or time of edentulism. CONCLUSIONS: When using an inline bone collector to harvest implant osteotomy sites, an average of 0.195 mL of bone can be obtained from a site approximately 4.0 x 13 mm. This bone can often be combined with a xenograft or alloplastic material to provide extra bulk to fill peri-implant defects. When multiple implant sites are prepared, often sufficient bone can be obtained with the bone collector alone.

Adult↗
PubMed1991

Dental implants.

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Aged↗
PubMed1989

Hydroxylapatite-coated dental implants. Biologic rationale and surgical technique.

Implant prosthodontics now offers our patients more benefits than conventional prosthetics. Considerations of bone biology, occlusal principles, occlusal materials, implant design, implant biomaterials, patient health profile, patient bone density and quality, site classification, manufacture quality and ethics, and operator efficiency all go into the prognosis and affect our final product. Emerging biomaterials help the clinician, in certain areas, to achieve a more predictable result. The time-tested principle--such as unloaded healing, atraumatic gentle surgical placement, and machined components--are carried along into the new systems that are being developed for clinical use. The use of the HA-coated cylinder has proved to be of extreme value in these past 5 years. It is another step closer to the ideal implant system.

Animals↗
PubMed1977

Dental implantation.

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American Dental Association↗