Implant Dentistry最新文献

Purpose: The aggressive juvenile ossifying fibroma is a benign fibro-osseous neoplasm that affects the jaws of young patients. The treatment can range from careful curettage to complete bone resection. Early dental rehabilitation through osseointegrated implants is indicated for functional recovery and esthetics.

Materials and methods: This article reports the case of a 20-year-old man submitted to osseous resection, installation of a titanium plate associated with bone graft and osteogenic substances with subsequent installation of osseointegrated dental implants.

Results: After 28 months of clinical and radiographic follow-up, there were no signs of tumor recurrence. As the patient showed good graft integration, 3 dental implants could be installed and are now waiting to receive a prosthetic work.

Conclusions: The use of a graft with morphogenetic proteins proved to be stable and efficient as it allowed the rehabilitation with dental implants.

Introduction: Osseodensification preserves bone bulk, facilitates compaction autografting, and deforms trabecular bone in an outward strain, which result in alveolar ridge plastic expansion. The aim of this retrospective study was to evaluate ridge expansion after osseodensification.

Materials and methods: Patients treated with implant placement through osseodensification were evaluated. The alveolar ridge width was measured at the level of the crest and 10 mm apical to the crest before and after osseodensification. Insertion torque and implant stability quotient (ISQ) values were recorded at implant placements. Expansion values were grouped into the following 3 groups according to the initial alveolar ridge width: group 1: 3 to 4 mm (n = 9), group 2: 5 to 6 mm (n = 12), and group 3: 7 to 8 mm (n = 7).

Results: Twenty-one patients who received 28 implants were included. Twenty-six implants were integrated, resulting in a survival rate of 92.8%. There was a significant difference in the mean expansion value at the coronal aspect of the ridge between group 1, group 2, and group 3 (2.83 ± 0.66 mm, 1.5 ± 0.97 mm, 1.14 ± 0.89 mm, P < 0.05). The mean torque and ISQ values were 61.2 ± 13.9 Ncm and 77 ± 3.74.

Conclusion: Osseodensification can alter ridge dimensions and allow for ridge expansion. Greater expansion can be expected at the crest in narrow ridges with adequate trabecular bone volume.

An upper/lower overdenture case, which presented with clinical entities commonly associated with the combination syndrome, is described. To the author's knowledge, this is the first documented case to illustrate such a particular association. The patient presented with an upper overdenture on 4 individual implants with attachments, without palatal coverage, opposing a lower bar overdenture on 4 implants, delivered more than 10 years before presentation. The patient complained about esthetics (poor display of upper teeth, excessive showing of lower teeth, and occlusal plane cant) and chewing. The anterior maxilla had severe bone loss, whereas the anterior mandible had a large amount of bone. Our retreatment included an upper overdenture with palatal coverage and a lower overdenture, both prostheses supported by individually attached implants. The article describes in detail the reasoning behind chosen retreatment, along with limitations and compromises.

Purpose: This study was conducted to investigate one-piece narrow-diameter implants installed in maxillary lateral and mandibular incisor sites using immediate nonfunctional loading.

Materials and methods: In this 10-year clinical trial study, 42 narrow-diameter (3.0-mm) one-piece implants for 35 patients were inserted. Clinical and radiographic measurements were recorded in 10 years and analyzed statistically using t test.

Results: A total of 26 patients (20 females and 6 males) with 30 implants were available for the 10-year follow-up. The 10-year implant survival rate was 100%. A statistically significant mean marginal bone loss was observed between 12 months and 10 years (0.18 ± 0.29 mm). The mean pocket depth increase was statistically significant (0.68 ± 0.83 mm). No bleeding on probing was observed around 90% of the implants. Full-mouth plaque index was registered at 20% of the implants.

Conclusion: The results obtained in this analysis suggest that modest marginal bone loss was observed around the implants. One-piece narrow-diameter implants (Maximus 3.0; BioHorizons) can predictably restore missing maxillary lateral incisors and mandibular incisors in cases of careful patient selection.

Objectives: To determine the effect of raloxifene (RAL) on bone response around implants in the maxilla of osteoporotic rats.

Materials and methods: Forty-five female rats at 8 weeks-old were divided into 3 groups: (1) control group, sham-operated rats, (2) ovariectomized group (OVX), and (3) ovariectomized and raloxifene-administered group (RAL). Eight weeks after the ovariectomy, upper right molar was extracted and an implant was placed at 4 weeks post-extraction. The RAL group was administered with 1 mg/kg/d of raloxifene via gavage while the OVX group and the control group received saline only. Three rats in each group were sacrificed at 1, 4, 7, 14, and 28 days and histologic sections were evaluated by hematoxylin and eosin staining and micro-computerized tomography was taken.

Results: The RAL group showed faster bone formation around the implant than the OVX group. At 4 weeks after implantation, newly formed bone close to implant threads was mature with considerable quantity of bone marrow in the RAL group.

Conclusion: Raloxifene showed increased bone formation around implant. This might have clinical implications in prosthetic restoration by dental implants for patients with poor bone quality.

We have encountered a rare case in which the subject underwent maxillary sinus floor elevation at another hospital, and a screw to fix the grafted bone substitute was forced into the maxillary sinus and intruded into the bone. Various different foreign bodies have been reported as being forced into the maxillary sinus due to dental treatment, and these foreign bodies are often retained on the maxillary sinus mucous membrane. However, no reports have described a screw forced in and intruded into the peculiar position in the bone, as seen in the present case, which we report here with additional discussion.

Purpose: The aim of this study was to evaluate the accuracy of computer-guided flapless implant (CGFI) surgery in edentulous jaws with fresh extraction sockets and compare it to CGFI in fully edentulous jaws.

Materials and methods: Ten patients with a completely edentulous arch (group A) and ten patients presenting natural teeth with a hopeless prognosis in the upper or lower jaw (group B) were consecutively treated with CGFI. A multipiece radiographic guide was fabricated for group B patients. The accuracy was assessed by matching the planning cone-beam computed tomography (CBCT) with a postoperative CBCT. Global coronal, global apical, angular deviation, and depth deviation were registered.

Results: The mean global coronal deviation for group A was 1.12 ± 0.5 mm, the mean global apical deviation was 1.36 ± 0.7 mm, the mean angular deviation was 3.16 ± 1.8 degrees, and the mean depth deviation was 0.51 ± 0.7 mm. The mean global coronal deviation for group B was 1.28 ± 0.6 mm, the mean global apical deviation was 1.65 ± 0.7 mm, the mean angular deviation was 3.42 ± 1.5 degrees, and the mean depth deviation was 0.53 ± 0.9 mm. Global apical deviation was significantly higher in the group B (P = 0.007).

Conclusion: CGFI surgery in edentulous arches with fresh extraction sockets may be accurate. However, clinicians should be aware that higher apical deviation may occur in this setting.

Introduction: The objective of this study is to evaluate the new bone formation after sinus floor augmentation with collagen plugs used as carriers for injectable platelet-rich fibrin (i-PRF).

Materials and methods: Postoperative immediate and postoperative 6th month panoramic radiographies of patients treated between January 1, 2015, and February 1, 2018, with sinus floor augmentation using i-PRF-soaked collagen plugs were retrieved from the archives, and subantral bone heights of distal and mesial regions of simultaneously inserted implants were measured with a software program. Statistical analysis was performed to understand whether there is a significant change in new bone formation at 6th month follow-up control.

Results: A total of 18 implants were inserted in 12 patients. There was significant new bone formation at 6th month follow-up radiography at mesial and distal regions of inserted implants (P < 0.05).

Conclusion: New bone was regenerated with i-PRF carried by collagen plugs in sinus floor augmentation.