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Results for “Alveolar Ridge Augmentation”

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At least 19 recordsLinked to original sources

PubMed1992

Chemical, physical, and histologic studies on four commercial apatites used for alveolar ridge augmentation.

The purpose of this study was to evaluate four commercial apatite products. Subperiosteal alveolar ridge augmentation was performed on the maxilla of rats by implantation of granules of two dense products and of two porous products, and the tissue response was compared with the material characteristics obtained by chemical analysis and infrared spectrometry. None of the apatites caused osteoinduction or osteoconduction; fibrous encapsulation with multinuclear giant cells was observed around all four types. One of the apatites was fluorapatite and not hydroxylapatite, as claimed by the manufacturer. The tissue response to this implant material was dominated by multinuclear giant cells.

Alveolar Process↗

PubMed1992

Alveolar ridge augmentation by osteoinductive materials in goats.

The purpose of the present study was to determine whether alveolar ridge augmentation could be induced in goats. In 12 male goats allogenic, demineralized, and lyophilized dentin or bone was implanted subperiosteally on the buccal sides of the natural edentulous regions of the alveolar process of the mandible. Light microscopic evaluation revealed fibrous encapsulation, a few multinuclear giant cells, little inflammatory reaction, and no osteoinduction. It was concluded that no osteoinduction took place in goats.

Alveolar Ridge Augmentation↗

PubMed1991

[Long time results of the Sandwich-technique for mandibular alveolar ridge augmentation].

During six years twenty-five patients have been operated upon using a "sandwich technique" for mandibular alveolar ridge augmentation. This technique was advocated by Schettler in 1974. In 3 cases, autologous rib cartilage was used, in 20 Cases an autologous transplant from the iliar crest and in two cases, autologous "cialit" conserved bone chips were inserted. All transplants healed without complications and less resorption was found in all transplants at the late follow-up examinations.

Alveolar Ridge Augmentation↗

PubMed1992

The effect of therapeutic radiation on canine alveolar ridges augmented with hydroxylapatite.

The purpose of this investigation was to evaluate the effect of radiation on hydroxylapatite (HA) implanted subperiosteally for alveolar ridge augmentation in dogs. All bicuspids and molars were extracted from 16 dogs. After 6 weeks, nonporous HA granules were implanted subperiosteally on the alveolar ridge. Following 4 months of healing, 12 dogs (experimental group) underwent therapeutic radiation therapy (Co60, 4,000 rad [40 Gy]) to the head and neck region. Four dogs were not irradiated and served as controls. Four animals (three experimental and one control) were killed at 5,6,7, and 8 months after HA augmentation. Light microscopic evaluation showed that approximately 25% of HA granules were encased by bone while the others were surrounded by fibrous connective tissue. Dissolution of the HA was observed. Microparticles of HA were phagocytized as part of a granulomatous inflammatory reaction. This reaction decreased significantly as time elapsed after implantation. Osteoclastic activity was seen at the junction of HA and periosteum and as part of bone remodeling. Dissolution of the HA granules and the granulomatous inflammatory reaction were not significantly increased by therapeutic radiation. The radiation did not cause development of dehiscence or osteonecrosis.

Alveolar Process↗

PubMed1978

Alveolar ridge augmentation with tricalcium phosphate ceramic.

Tricalcium phosphate ceramic, with 50% porosity and 400 to 500 micrometer pore diameter, was used to augment the edentulous alveolar ridge of 10 adult mongrel dogs. The implants were evaluated histologically at different time intervals (7, 30, 90, 180, and 360 days). Preoperative and postoperative blood chemistry studies were also evaluated. The results showed that, other than for the expected acute nonspecific inflammatory response due to the surgery, the material was well tolerated by the tissues and was nontoxic. Bone and soft tissues grew into the pores, thereby creating an excellent biomechanical bond between the ceramic implant and surrounding structures. Preoperative and postoperative blood chemistry studies demonstrated no significant change.

Alveolar Process↗

PubMed1977

Clinical and experimental results of a sandwich-technique for mandibular alveolar ridge augmentation.

During the past two and a half years, thirteen patients have been operated upon using a "sandwich-technique" for mandibular alveolar ridge augmentation. This new technique was advocated by Schettler in 1974. In 3 cases, autologous rib cartilage was used, in 6 cases an autologous transplant from the iliac crest, and on four occasions, autologous "cialit"-conserved bone chips were inserted. All transplants healed without complications and no resorption was found in either the autologous or homologous transplants at the late follow-up examinations. These findings are supported by animal experiments in rabbits with the aid of the polychrome sequence marking technique using fluorochromes.

Animals↗

PubMed1991

Alveolar ridge augmentation in rats by Bio-Oss.

The purpose of the study was to examine if Bio-Oss initiated osteoinduction or osteoconduction when implanted into rats. Sintered and unsintered granules of the anorganic bovine bone Bio-Oss was implanted subperiosteally for alveolar ridge augmentation purposes and heterotopically in the abdominal muscles of rats. Light microscopic evaluation revealed no osteoinduction or osteoconduction in connection with sintered or unsintered Bio-Oss. A foreign body reaction was observed around both forms.

Abdominal Muscles↗

PubMed1991

Alveolar ridge augmentation in rats by combined hydroxylapatite and osteoinductive material.

The purpose of this study was to examine if increased bony ingrowth developed when hydroxylapatite was implanted together with an osteoinductive substrate. Dense hydroxylapatite granules (HA) (Calcitite, Calcitek, San Diego, CA, USA) were mixed with equal volumes of allogenic, demineralized, lyophilized dentin or bone and implanted subperiosteally for alveolar ridge augmentation purposes and heterotopically in the abdominal muscles in rats. Light microscopic evaluation revealed that HA was surrounded by fibrous connective tissue containing foreign body giant cells and it had neither an osteoinductive nor an osteoconductive effect. The newly formed bone induced from the implanted allogenic, demineralized, lyophilized dentin or bone was never found in close contact with the HA and did not incorporate the implant.

Abdominal Muscles↗

PubMed1991

[Experimental investigation on application of hydroxyapatite implant to alveolar ridge augmented by porous hydroxyapatite granules--histological observation on implant and implant covered with autogenous iliac bone].

UNLABELLED: The purpose of this study was to investigate the possibility of applying the hydroxyapatite implant and the hydroxyapatite implant covered with autogenous iliac bone to the augmented mandible. Three months after the extractions of the lower P3, P4, and M1 of mongrel dogs, alveolar ridge augmentations were performed widely with porous hydroxyapatite granules. After one month, the hydroxyapatite implants were inserted in the iliac bone of the same dog. Four months after the augmentation, the hydroxyapatite implant and the hydroxyapatite implant covered with autogenous iliac bone were implanted only in the augmented area with the granules of the mandible. Two months later, specimens were taken out and fixed by 10% formalin alcohol. They were embedded in polyester resin and undecalcified sections were prepared. The sections were stained with toluidine blue and observed under light microscope. RESULTS: 1) Bone ingrowth was seen in most parts of the intergranular spaces and in some spaces fibrous connective tissues were observed. 2) The hydroxyapatite implant was partly attached to the bone. But a large surface of the implant was connected to the fibrous tissues among the granules. 3) The hydroxyapatite implant covered with the iliac bone was combined with the bone of the intergranular spaces.

Alveolar Process↗

PubMed1992

Current status of tissue expanders in alveolar ridge augmentation: a review.

The need for major surgery involving bone and skin grafting procedures in the treatment of severe alveolar atrophy has, for many patients, been obviated by the advent of reliable endosseous implant systems. However, some patients, usually for medical, psychological, or financial reasons are unsuitable for endosseous implant therapy. In such patients, ridge augmentation with particulate hydroxyapatite may result in significantly improved denture function. However, hydroxyapatite tends to disseminate throughout any surgically created subperiosteal space, resulting in an undesirable ridge form. This problem may be overcome by the use of tissue expanders in a two-stage surgical procedure. This article briefly reviews the concept of tissue expansion and describes its application to the technique of alveolar ridge augmentation.

Alveolar Ridge Augmentation↗

PubMed1992

Use of polyglactin 910 knitted mesh tubing to stabilize particulate hydroxyapatite in alveolar ridge augmentation. A preliminary report.

A universal problem with the use of hydroxyapatite (HA) particles has been the tendency for these particles to migrate beyond planned boundaries. This is a preliminary report on the use of polyglactin 910 knitted mesh (Vicryl) tubing containing HA particles in ridge-augmentation procedures, assessing the technique and the containment of HA particles. The technique is described and experience with six cases is presented. This study found no clinical or radiographic evidence of particle migration after normal function had been resumed. In one case the graft failed to become firmly incorporated with the bone and the whole graft migrated anteriorly on the mandible but still provided improved function for the patient. The technique facilitates the placement of HA particles and would be particularly useful if open mucosal flap techniques were being used for ridge augmentation. The use of Vicryl tubing for HA augmentation procedures prevents the migration of particles and allows an easier and more accurate placement of the grafts.

Adult↗

PubMed1992

Modified roll technique for localized alveolar ridge augmentation.

A modification of Abram's roll technique is described. A "trap-door" approach is used to reflect and preserve the epithelium that overlies the connective tissue pedicle; the epithelial pedicle is used to cover the donor site. Two case reports illustrate the technique.

Adult↗

PubMed1992

Maxillary alveolar ridge augmentation with onlay bone-grafts and immediate endosseous implants.

Management of the atrophic maxilla can be a taxing surgical problems. One treatment alternative is to use autogenous bone transplants and immediate titanium fixture implantation. Despite the extensive literature on routine implant treatment of the edentulous jaws, only very few reports have dealt with the outcome of bone graft reconstructive surgery as part of the dental implant restoration. This study presents the treatment and healing results of 8 consecutive patients, who, over a period of 2 years and 8 months, were treated using onlay iliac bone grafts to atrophic maxillary alveolar ridges with immediate implant insertion. The patients were followed for 32-64 months. 83% of the fixtures (n = 46) were well-integrated. Two fixtures in each of 2 patients were lost due to traumatic bone-graft fractures. Palpatory bone-graft volume and prosthetic function were, with the exception of 1 patient, good. Radiological examination demonstrated preservation of the major part of the vertical dimension of the grafted bone. Patient's assessment was of good aesthetics and intraoral function; 2 patients had minor phonetic problems. In conclusion, similar success to routine maxillary implant treatment can be achieved in the event of extreme maxillary bone deficiency, by bone grafting and immediate fixture insertion.

Adult↗

PubMed1991

Alveolar ridge augmentation with hydroxylapatite using fibrin sealant for fixation. Part II: Clinical application.

The use of fibrin as a resorbable biological adhesive permits moulding of HA granules into individually shaped implants. The binder prevents dislocation of granules during delivery, and the moulded implants securely retain their shape until fibrous tissue ingrowth is complete. Three years of clinical experience have shown that, mouldable fibrin-bound HA has so far proved suitable as a bone substitute in preprosthetic as well as in plastic and reconstructive surgery.

Aged↗

PubMed1991

Alveolar ridge augmentation with hydroxylapatite using fibrin sealant for fixation. Part I: An experimental study.

Histological studies in animals have shown that fibrin sealant can be employed as a resorbable, biological binding agent for fixation of initially mouldable hydroxylapatite (HA) implants. Mixing HA granules with a 2 component fibrin sealant from which thrombin solution has been diluted to 1 IU/ml provides a simple method for obtaining mouldable implants. During insertion of the HA granules, the sealant prevents dislocation and migration, and on solidification, the moulded implant securely retains its shape and position until connective tissue ingrowth is complete. The use of polygonal granules permits a constant implant contour from the very beginning.

Alveolar Ridge Augmentation↗

PubMed1992

Alveolar ridge augmentation with collagen tubes containing bone and hydroxylapatite.

The use of collagen tube containers with implants of an autogenous bone and particulate hydroxylapatite composite is reported. The tubes were used to shape the mixture and to facilitate its implantation in cases of severe mandibular resorption. Following a minimum of 60 months after implant placement and a minimum of 48 months of denture wear, the implant and overall prosthodontic success were rated favorably by the patient and the prostodontist. Individual implants were evaluated with polarized and fluorescent light microscopy and with microradiography. While the clinical results were good, the microscopic evaluation showed the amount of bone present within the implant to be variable.

Aged↗

PubMed1979

Long-term results of alveolar ridge augmentation.

Autologous onlay rib grafts in 22 patients were evaluated for bone remodeling patterns. The patients had been followed up for four to ten years; the mean was 6.2 years. The unquantitated increase in bony mass of the mandible, with altered ridge form and subsequent soft tissue surgery, provided consistent, predictable results and return to excellent denture function with long-term stability.

Alveolar Process↗

PubMed2026

Flap Versus Tunneling for Horizontal Ridge Augmentation With FDBA and i-PRF: A Randomized Controlled Clinical Trial.

AIM: This study evaluated the efficacy of conventional flap and tunneling techniques for horizontal alveolar ridge augmentation using freeze-dried bone allograft (FDBA) particles combined with injectable platelet-rich fibrin (i-PRF). MATERIALS AND METHODS: Forty-five patients were randomly allocated to one of three groups (n = 15 each): conventional flap (CF), tunneling with membrane (TM), or tunneling without membrane (TnM). Preoperative ridge width was measured via cone beam computed tomography (CBCT). All augmentation procedures incorporated FDBA and i-PRF; an absorbable collagen membrane was applied in the CF and TM groups. Follow-up assessments, including CBCT imaging and histomorphometric analysis, were conducted 6 months postoperatively. For normally distributed data, ANOVA with Tukey's post hoc test and paired samples t-test were applied. Non-normally distributed data were analyzed using Kruskal-Wallis, Mann-Whitney U, and Wilcoxon signed-rank tests. RESULTS: Statistical analysis was performed on 43 patients. All groups demonstrated an increase in ridge width after 6 months. At the 2 mm level, the mean width gain was 1.28 mm (95% CI: 0.17 to 2.40) in the TM group, 2.85 mm (95% CI: 1.80 to 3.89) in the TnM group, and 1.95 mm (95% CI: 1.07 to 2.83) in the CF group. However, statistical analysis revealed no significant intergroup variation (p > 0.05). Histomorphometric assessments similarly demonstrated comparable outcomes across all groups, with no statistically significant differences observed (p > 0.05). CONCLUSION: Within the limitations of this study, the tunneling technique, regardless of membrane use, appears to be a clinically viable alternative to the conventional flap method for horizontal alveolar ridge augmentation. However, further studies with longer follow-up periods are required to substantiate these findings. TRIAL REGISTRATION: irct.behdasht.gov.ir identifier: IRCT 20101204005305N21.

Humans↗