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Applicability of cone beam computed tomography gray values for estimation of primary stability of dental implants / Aplicabilidade dos valores de cinza da tomografia computadorizada de feixe cônico na estimativa da estabilidade primária de implantes dentários
Sheikhi, Mahnaz; Karami, Mehdi; Abbasi, Somayeh; Moaddabi, Amirhossein; Soltani, Parisa.
  • Sheikhi, Mahnaz; Isfahan University of Medical Sciences. School of Dentistry. Torabinejad Dental Research Center, Department of Oral and Maxillofacial Radiology. Isfahan. IR
  • Karami, Mehdi; Isfahan University of Medical Sciences. School of Medicine. Department of Radiology. Isfahan. IR
  • Abbasi, Somayeh; Islamic Azad University. Department of Mathematics, Isfahan (khorasgan) Branch. Isfahan. IR
  • Moaddabi, Amirhossein; Mazandaran University of Medical Sciences. School of Dentistry. Department of Oral and Maxillofacial Surgery. Sari. IR
  • Soltani, Parisa; Isfahan University of Medical Sciences. Dental Implants Research Center, Dental Research Institute. Department of Oral and Maxillofacial Radiology. Isfahan. IR
Braz. dent. sci ; 24(1): 1-8, 2021. tab, ilus
Article in English | BBO, LILACS | ID: biblio-1145561
RESUMO

Objetivo:

Avaliar a relação entre a densidade óssea medida em imagens de tomografia computadorizada (TC) e tomografia computadorizada de feixe cônico (TCFC) e relacionar com a estabilidade primária de implantes dentários. Material e

métodos:

Foram utilizadas neste estudo 20 cabeças femorais bovinas frescas, preparadas pela remoção de partes moles, secção do osso e colocação de marcadores para localização e angulação dos implantes. A densidade óssea da área peri-implantar foi determinada no pré-operatório em imagens TC e TCFC das amostras de osso peparado, representadas por unidades Hounsfield (HUs) e valores de cinza (GVs), respectivamente. Em seguida, 60 implantes em três tamanhos (diâmetro = 4 mm, comprimento = 8, 10 e 12 mm) foram inseridos nos ossos e o torque máximo de inserção (TI) foi registrado. O dispositivo Osstell também foi usado para determinar o quociente de estabilidade do implante (ISQ) para cada implante. A análise estatística foi realizada nos dados (α = 0,05).

Resultados:

Os valores médios ± DP de GV,HU e ISQ foram 1592,75 ± 231,82, 675,26 ± 115,38 e 61,90 ± 10,14, respectivamente. Além disso, o limite de TI mais frequente foi 30-35 Ncm (41,4%). Relações significativas foram observadas entre HU e IT, GV e IT, HU e ISQ, GV e ISQ, e IT e ISQ em todos os tamanhos de implante. Os GV e HU também se correlacionaram significativamente.

Conclusão:

Os valores da densidade óssea em imagens de TCFC e TC mostram-se positivamente associados para estabilidade primária de implantes dentários. Portanto, os GVs obtidos no Sistema de TCFC (Sirona's Galileos) poderiam ser usados para a seleção pré-operatória de sítios edêntulos que permitam uma melhor estabilidade do implante ou locais que requerem procedimentos adicionais para aumentar a taxa de sucesso dos implantes dentários. (AU)
ABSTRACT

Objective:

To evaluate the relationship between bone density measured by computed tomography (CT) and cone beam computed tomography (CBCT) (Sirona's Galileos scanner) with primary stability of dental implants. Material and

methods:

20 fresh bovine femoral heads were prepared by removal of soft tissue, sectioning of the bone, and placement of markers for location and angulation of implants. Bone density of peri-implant areas was determined preoperatively by CT and CBCT scanning of the prepared bone samples represented by Hounsfield units (HUs) and gray values (GVs), respectively. Then, 60 implants in three sizes (diameter = 4 mm, length = 8, 10, and 12 mm) were inserted into the bones and maximum insertion torque (IT) was recorded. Osstell device was also used for determining the implant stability quotient (ISQ) for each implant. Statistical analysis was performed on the data (α = 0.05).

Results:

Mean ± SD values of GV,HU, and ISQ were 1592.75 ± 231.82, 675.26 ± 115.38 and 61.90 ± 10.14, respectively. Moreover, the most frequent IT limit was 30-35 Ncm (41.4%). Significant relationships were observed between HU and IT, GV and IT, HU and ISQ, GV and ISQ, and IT and ISQ in all implant sizes. Moreover, GV and HU also significantly correlated to each other.

Conclusion:

Bone density values in CBCT and CT scans are positively associated to primary stability of dental implants. Therefore, GVs obtained from Galileos CBCT scanner can be used for preoperative selection of edentulous sites which allow for better implant stability or locations which require further procedures for enhancing the success rate of dental implants (AU)
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Tomography, X-Ray Computed / Dental Implantation / Cone-Beam Computed Tomography Limits: Animals Language: English Journal: Braz. dent. sci Journal subject: Dentistry / Sa£de Bucal Year: 2021 Type: Article Affiliation country: Iran Institution/Affiliation country: Isfahan University of Medical Sciences/IR / Isfahan University of Medical Sciences/IR / Islamic Azad University/IR / Mazandaran University of Medical Sciences/IR

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Full text: Available Index: LILACS (Americas) Main subject: Tomography, X-Ray Computed / Dental Implantation / Cone-Beam Computed Tomography Limits: Animals Language: English Journal: Braz. dent. sci Journal subject: Dentistry / Sa£de Bucal Year: 2021 Type: Article Affiliation country: Iran Institution/Affiliation country: Isfahan University of Medical Sciences/IR / Isfahan University of Medical Sciences/IR / Islamic Azad University/IR / Mazandaran University of Medical Sciences/IR