J Periodontal Implant Sci.  2020 Feb;50(1):38-47. 10.5051/jpis.2020.50.1.38.

Alveolar bone height according to the anatomical relationship between the maxillary molar and sinus

Affiliations
  • 1Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, Seoul, Korea. sshan@yuhs.ac
  • 2Department of Periodontics, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, Korea.

Abstract

PURPOSE
The aim of this study was to investigate the available alveolar bone height between the maxillary molars and the sinus floor according to their anatomical relationship using cone-beam computed tomographic (CBCT) images.
METHODS
A total of 752 maxillary first (M1) and second molars (M2) on CBCT scans of 188 patients were selected. First, each maxillary molar was categorized as type 1, 2, 3, or 4 according to the relationship of the molar root with the maxillary sinus floor. The frequency distribution of each type was analyzed. Second, the shortest vertical distance (VD) of each molar was measured from the furcation midpoints of the roots to the lowest point of the sinus floor by 2 observers. Intraclass correlation coefficients and the t-test were calculated for the VD measurements.
RESULTS
For M1, type 3 was the most frequent, followed by type 2. For M2, type 3 was the most common, followed by type 1. The VD measurements of type 1 were 9.51±3.68 mm and 8.07±2.73 mm for M1 and M2, and those of type 3 were 3.70±1.52 mm and 4.03±1.53 mm for M1 and M2, respectively. The VD measurements of M2 were significantly higher in female patients than in male patients.
CONCLUSIONS
Type 3 was the most frequent anatomical relationship in the maxillary molars, and showed the lowest alveolar bone height. This information will help clinicians to prevent complications related to the maxillary sinus during maxillary molar treatment and to predict the available bone height for immediate implant planning.

Keyword

Cone-beam computed tomography; Dental implants; Maxillary sinus; Molar

MeSH Terms

Cone-Beam Computed Tomography
Dental Implants
Female
Humans
Male
Maxillary Sinus
Molar*
Dental Implants

Figure

  • Figure 1 Overall flowchart of image reconstruction for reproducible measurements of the available alveolar bone height. (A) The occlusal plane of the original data was reoriented to be parallel to the base plane. (B) The CBCT image was aligned to be perpendicular to the arch shape at the cervical level of the maxillary molars. (C) Reconstruction of the cross-sectional image. CBCT: cone-beam computed tomography.

  • Figure 2 Illustrations of the classification of the relationship between the maxillary molars and the sinus floor.

  • Figure 3 Measurement of the shortest vertical distance from the furcation midpoint of the maxillary molar to the sinus floor.

  • Figure 4 The frequency distribution of the classification in the maxillary first molars (A) and second molars (B).


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