Korean J Orthod.  2009 Dec;39(6):354-361. 10.4041/kjod.2009.39.6.354.

Consideration of maxillary sinus bone thickness when installing miniscrews

• Kim DH
• Lee JW
• Cha KS
• Chung DH

• KMID: 1975779
• DOI: http://doi.org/10.4041/kjod.2009.39.6.354

Abstract

OBJECTIVE
Miniscrews are widely used in orthodontic treatment for the purpose of anchorage control. Maximum anchorage can be acquired by the use of miniscrews. Maxillary miniscrew has many clinical advantage for orthodontic treatment. Maxillary sinus, tooth root can be an obstacle for maxillary miniscrew installation. The purpose of this study was to find the safest area and direction of miniscrew insertion in consideration of the maxillary sinus. METHODS: The maxillary sinus area of 40 patients (20 male, 20 female) was measured using 3D computed tomography and 3D reconstruction program. RESULTS: The maxillary sinus floor was located most inferiorly between the 1st molar and 2nd molar and located most superiorly between the 1st premolar and 2nd premolar. Buccal bone thickness from the maxillary sinus is significantly thicker between the 1st molar and 2nd molar and significantly thinner between the 1st premolar and 2nd premolar. The area between the 1st premolar and 2nd premolar has a significantly longer vertical distance from CEJ to sinus in consideration of buccal bone thickness. CONCLUSIONS: Considering maxillary bone thickness, the posterior area has advantages over the anterior area for installing miniscrews safely and preventing perforation.

Keyword

Miniscrew; Maxillary sinus

MeSH Terms

Bicuspid
Floors and Floorcoverings
Humans
Imidazoles
Male
Maxilla
Maxillary Sinus
Molar
Nitro Compounds
Tooth Cervix
Tooth Root
Imidazoles
Nitro Compounds

Figure

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  Fig. 1 Definition of vertical bone thickness (A) between CEJ and sinus floor in frontal view.

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  Fig. 2 Definition of horizontal bone thickness (B) from sinus floor to buccal bone margin in axial view.

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  Fig. 3 Vertical bone thickness between CEJ and sinus floor when horizontal bone thickness is 4 mm (C1), 3 mm (C2), and 2 mm (C3) in frontal view.

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  Fig. 4 Available vertical bone height from CEJ when horizontal bone thickness is 4 mm for all 80 samples. Pm, Maxillary premolar; M, maxillary molar.

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