1/10/24 IJPRD Flashcards
Describe the study about Implant transmucosal contouring.
Pelekanos & Vergoullis, IJPRD
Anatomical healing abutment has 2 zones: Subzenith and suprazenith.
Subzenith:
> Deep zone = CT and crestal bone attachment
> Transition zone = junctional epithelium attachment
> Cervical zone: Adaption to the marginal soft tissue and plaque control
Plastic materials like resins (acrylic, composite) and polyethyl- / polymethyl- methacrylates , allow epithelial attachment if they are polished (but not varnished or chlorhexidine treated)
Deep zone: Can be provided by the polished collar of the implant. Ideal emergence is ≤15 degrees, and is either straight or concave.
Transition zone: Emergence angle must be between 0 - 90 degrees. Can be convex (if thick tissue), or straight / concave (if thin tissue)
> Must respect interproximal papilla space of 1.5 -2mm
Describe the article “Maxillary sinus elevation by crestal window”, on the influence of sinus 3D size on bone regeneration
Soardi et al. IJPRD = including Dr. Wang
Used piezos to elevate a crestal sinus window; added 4:1 mix of cortical : cancellous mineralized human allograft. Collected bone core trephines at 4-5 months postop; analysis via CBCT and histology.
Results: 39 patients total.
> Narrow sinus: < 15mm Bucco-palatal distance (BPD).
> Wide sinus: >15mm BPD
>Short sinus: “hemi-ellipsoidal volume” averaging 1,624 mm3
> Long sinus: “Hemi-ellipsoidal volume” averaging 2,898 mm3
Result: Narrow and short sinuses had the lowest amounts of soft tisue and greatest amount of bone. = Sinus size only affects soft tissue and bone, but not residual graft.
Describe the study on the Effectiveness of Hyaluronic acid injection for papilla recovery
da Silva et al. IJRPD
Injected hyaluronic acid (HA) into papillas with “black triangles”
6 patients with 19 defective papillae. 0.2 mL HA injected 2-3 mm into the papilla tip
Scans at 1, 2, 3, 4 months post-injection.
Result: NSSD in linear tissue gains. However, at 3 months there was a “significant increase in size percentage” compared to baseline (58% +/- 32.9% at T3, versus baseline 30.41% +/- 23.4%.
Describe the article on the effectiveness of Bichat’s buccal fat pad for vertical ridge augmentation in the maxilla
Cucchi et al IJPRD
Used buccal fat pad to cover nonresorbable membranes for vertical GBR in the maxilla.
12 patients (6 with a history of periodontitis, 4 who were smokers)
Used 50:50 autogenous : BioOss and either Titanium mesh or dPTFE membranes. (Resorbable membrane placed on top). Buccal fat pad placed over all of it.
No early or late exposures occurred. 1 patient had intraoperative hemmorrhage, and 1 had temporary paresthesia (lasting <1 month). Vertical bone gain was 4.2 mm +/- 1.8mm.
Describe the study on maxillary sinus floor augmentation with a new porcine-apatite xenograft - a case series.
Soardi et al IJPRD = including Dr. Wang
Evaluate the clinical and histologic results of using this novel porcine-apatite xenograft (“RegenerOss”) at 6, 9, 12 months after crestal window sinus elevation.
24 Patients had ≤2 mm of crestal bone height at the sinus floor.
Results: Lots of residual graft particles present in the core histologies. = NSSD at 6, 9, 12 months. (6 mo: 12% residual graft; 9mo: 7%; 12mo: 6%).
However, there was SSD in % soft tissue and % bone at 6 and 12 months. (Soft tissue: 70% at 6mo, 54% at 12mo. Bone: 19% at 6mo; 40% at 12mo).
Conclusion is that RegenerOss can be successfully used in crestal sinus augmentation.
Describe the study on Artificial intelligence for identifying dental implants on radiographs.
Hsiao et al IJPRD
Used 10 different AI systems to identify implants in radiographs. Overall 90% accuracy was achieved.
The highest accuracy was from ShuffleNet, achieving 97% accuracy.
The fastest was Nvidia 1050Ti , identifying them in less than 0.2 seconds.
