EAO‐384/PO‐PIB‐001 | Orthodontic mini‐implant migration: a histological and histomorphometric study in rat vertebrae.

Implant primary stability, which depends mainly on the amount and quality of bone, is important for implant survival. Socket preservation aims to reduce bone volumetric changes following tooth extraction. This animal study aims to examine whether preserving a ridge by using xenograft impairs the primary stability of the implant. Eighteen artificial bone defects were prepared in four sheep (5mmØ and 8mm length). Defects were randomly grafted with xenografts: Bio-Oss (BO), Bioactive Bone (BB), or left for natural healing (control). After 8 weeks, bone biopsy was harvested and dental implants installed. During installation, peak insertion torque (IT) was measured by hand ratchet, and primary stability by the Osstell method. Histomorphometric analysis showed a higher percentage of new bone formation in the naturally healed defects compared to sites with xenograft (control 68.66 ± 4.5%, BB 48.75 ± 4.34%, BO 50.33 ± 4.0%). Connective tissue portion was higher in the BO and BB groups compared to control (44.25 ± 2.98%, 41 ± 6%, and 31.33 ± 4.5, p<0.05, respectively). Residual grafting material was similar in BO and BB (7 ± 2.44%, 8.66 ± 2.1 %, respectively). Mean IT and ISQ values were not statistically different among the groups. A positive correlation was found between IT and ISQ (r=0.65, p=0.00). In conclusion, previously grafted defects with xenograft did not influence primary stability and implant insertion torque in delayed implant placement. These results may be attributed to a relatively high bone fill of the defect (~50%) two months after grafting.

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Anorganic bovine-derived hydroxyapatite versus β-tricalcium phosphate in sinus augmentation. A comparative histomorphometric study

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-11-00061.1 ◽

2012 ◽

pp. 120522093526004

Author(s):

Mehmet Kurkcu ◽

Mehmet Emre Benlidayi ◽

Burcu Cam ◽

Yasar Sertdemir

Keyword(s):

Tricalcium Phosphate ◽

Sinus Augmentation ◽

Histomorphometric Study

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Evaluation, the Histomorphometric Study of Nanocrystalline Hydroxyapatite (Nano Bone) Wif Lovastatin in the Preservation of the Tooth Socket

Case Medical Research ◽

10.31525/ct1-nct03981601 ◽

2019 ◽

Author(s):

Keyword(s):

Tooth Socket ◽

Histomorphometric Study ◽

Nanocrystalline Hydroxyapatite

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Histomorphometric Study on the Effects of Methotrexate on Gonads: An Experimental Study in Albino Rat

Academia Anatomica International ◽

10.21276/aanat.2015.1.1.10 ◽

2015 ◽

Vol 1 (1) ◽

Author(s):

Rati Tandon ◽

Nusra Rahman ◽

Arsalan Moinuddin ◽

Mudrika Gaur ◽

Gulshan Battan ◽

...

Keyword(s):

Experimental Study ◽

Albino Rat ◽

Histomorphometric Study

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Fixation stability and implant-associated complications in periacetabular osteotomy: a comparison of screw and K-wire fixation

Archives of Orthopaedic and Trauma Surgery ◽

10.1007/s00402-021-04112-7 ◽

2021 ◽

Author(s):

Vincent Justus Leopold ◽

Juana Conrad ◽

Robert Karl Zahn ◽

Christian Hipfl ◽

Carsten Perka ◽

...

Keyword(s):

Soft Tissue ◽

Screw Fixation ◽

Periacetabular Osteotomy ◽

Implant Migration ◽

Major Complications ◽

Significant Difference ◽

Duration Of Surgery ◽

Wire Fixation ◽

Fixation Stability ◽

Screw Group

Abstract Aims The aim of this study was to compare the fixation stability and complications in patients undergoing periacetabular osteotomy (PAO) with either K-wire or screw fixation. Patients and methods We performed a retrospective study to analyze a consecutive series of patients who underwent PAO with either screw or K-wire fixation. Patients who were treated for acetabular retroversion or had previous surgery on the ipsilateral hip joint were excluded. 172 patients (191 hips: 99 K-wire/92 screw fixation) were included. The mean age at the time of PAO was 29.3 years (16–48) in the K-wire group and 27.3 (15–45) in the screw group and 83.9% were female. Clinical parameters including duration of surgery, minor complications (soft tissue irritation and implant migration) and major complications (implant failure and non-union) were evaluated. Radiological parameters including LCE, TA and FHEI were measured preoperatively, postoperatively and at 3-months follow-up. Results Duration of surgery was significantly reduced in the K-wire group with 88.2 min (53–202) compared to the screw group with 119.7 min (50–261) (p < 0.001). Soft tissue irritation occurred significantly more often in the K-wire group (72/99) than in the screw group (36/92) (p < 0.001). No group showed significantly more implant migration than the other. No major complications were observed in either group. Postoperative LCE, TA and FHEI were improved significantly in both groups for all parameters (p = < 0.0001). There was no significant difference for initial or final correction for the respective parameters between the two groups. Furthermore, no significant difference in loss of correction was observed between the two groups for the respective parameters. Conclusion K-wire fixation is a viable and safe option for fragment fixation in PAO with similar stability and complication rates as screw fixation. An advantage of the method is the significantly reduced operative time. A disadvantage is the significantly higher rate of implant-associated soft tissue irritation, necessitating implant removal. Level of evidence III, retrospective trial.

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