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Assessment of maxillary third molars with panoramic radiography and cone-beam computed tomography.

Jung YH, Cho BH - Imaging Sci Dent (2015)

Bottom Line: Almost all of the Level C molars were in contact with the roots of the second molar.Erupted teeth most commonly had three roots, and completely impacted teeth most commonly had one root.The superimposition of one third of the root and the sinus floor was most commonly associated with the sinus floor being located on the buccal side of the root.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Yangsan, Korea.

ABSTRACT

Purpose: This study investigated maxillary third molars and their relation to the maxillary sinus using panoramic radiography and cone-beam computed tomography (CBCT).

Materials and methods: A total of 395 maxillary third molars in 234 patients were examined using panoramic radiographs and CBCT images. We examined the eruption level of the maxillary third molars, the available retromolar space, the angulation, the relationship to the second molars, the number of roots, and the relationship between the roots and the sinus.

Results: Females had a higher frequency of maxillary third molars with occlusal planes apical to the cervical line of the second molar (Level C) than males. All third molars with insufficient retromolar space were Level C. The most common angulation was vertical, followed by buccoangular. Almost all of the Level C molars were in contact with the roots of the second molar. Erupted teeth most commonly had three roots, and completely impacted teeth most commonly had one root. The superimposition of one third of the root and the sinus floor was most commonly associated with the sinus floor being located on the buccal side of the root.

Conclusion: Eruption levels were differently distributed according to gender. A statistically significant association was found between the eruption level and the available retromolar space. When panoramic radiographs showed a superimposition of the roots and the sinus floor, expansion of the sinus to the buccal side of the root was generally observed in CBCT images.

No MeSH data available.


Related in: MedlinePlus

The horizontal relationship between the root of the maxillary third molars and the sinus on cone-beam computed tomography images. A. Type B, the lowest point of the sinus floor is located on the buccal side of the root. B. Type C, the root is projects into the sinus. C. Type P, the lowest point of the sinus is located on the palatal side of the root. D. Type M, the lowest point of the sinus is located on the mesial side of the third molar. E. Type D, the lowest point of the sinus is located on the distal side.
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Figure 5: The horizontal relationship between the root of the maxillary third molars and the sinus on cone-beam computed tomography images. A. Type B, the lowest point of the sinus floor is located on the buccal side of the root. B. Type C, the root is projects into the sinus. C. Type P, the lowest point of the sinus is located on the palatal side of the root. D. Type M, the lowest point of the sinus is located on the mesial side of the third molar. E. Type D, the lowest point of the sinus is located on the distal side.

Mentions: On CBCT images, the angulation of the maxillary third molars, the number of roots, and the horizontal relationship between the roots of the third molars and the sinus were investigated. The angulation of the maxillary third molar with respect to the long axis of the second molar was classified as vertical, buccoangular, linguoangular, buccolingual, mesioangular, distoangular, horizontal, and inverted using a modified version of Winter's classification (Fig. 4). The number of roots was classified into one fused root, two roots, three roots, and four roots. Class 3, class 4, and class 5 relationships on panoramic radiographs were subclassified into five types according to the horizontal relationship between the roots of the third molars and the sinus on CBCT images: type B, the lowest point of the maxillary sinus floor is located on the buccal side of the root; type C, the root projects into the sinus; type P, the lowest point of the sinus floor is located on the palatal side of the root; type M, the lowest point of the maxillary sinus floor is located on the mesial side of the maxillary third molar; and type D, the lowest point of the maxillary sinus floor is located on the distal side of the maxillary third molar (Fig. 5).


Assessment of maxillary third molars with panoramic radiography and cone-beam computed tomography.

Jung YH, Cho BH - Imaging Sci Dent (2015)

The horizontal relationship between the root of the maxillary third molars and the sinus on cone-beam computed tomography images. A. Type B, the lowest point of the sinus floor is located on the buccal side of the root. B. Type C, the root is projects into the sinus. C. Type P, the lowest point of the sinus is located on the palatal side of the root. D. Type M, the lowest point of the sinus is located on the mesial side of the third molar. E. Type D, the lowest point of the sinus is located on the distal side.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4697008&req=5

Figure 5: The horizontal relationship between the root of the maxillary third molars and the sinus on cone-beam computed tomography images. A. Type B, the lowest point of the sinus floor is located on the buccal side of the root. B. Type C, the root is projects into the sinus. C. Type P, the lowest point of the sinus is located on the palatal side of the root. D. Type M, the lowest point of the sinus is located on the mesial side of the third molar. E. Type D, the lowest point of the sinus is located on the distal side.
Mentions: On CBCT images, the angulation of the maxillary third molars, the number of roots, and the horizontal relationship between the roots of the third molars and the sinus were investigated. The angulation of the maxillary third molar with respect to the long axis of the second molar was classified as vertical, buccoangular, linguoangular, buccolingual, mesioangular, distoangular, horizontal, and inverted using a modified version of Winter's classification (Fig. 4). The number of roots was classified into one fused root, two roots, three roots, and four roots. Class 3, class 4, and class 5 relationships on panoramic radiographs were subclassified into five types according to the horizontal relationship between the roots of the third molars and the sinus on CBCT images: type B, the lowest point of the maxillary sinus floor is located on the buccal side of the root; type C, the root projects into the sinus; type P, the lowest point of the sinus floor is located on the palatal side of the root; type M, the lowest point of the maxillary sinus floor is located on the mesial side of the maxillary third molar; and type D, the lowest point of the maxillary sinus floor is located on the distal side of the maxillary third molar (Fig. 5).

Bottom Line: Almost all of the Level C molars were in contact with the roots of the second molar.Erupted teeth most commonly had three roots, and completely impacted teeth most commonly had one root.The superimposition of one third of the root and the sinus floor was most commonly associated with the sinus floor being located on the buccal side of the root.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Yangsan, Korea.

ABSTRACT

Purpose: This study investigated maxillary third molars and their relation to the maxillary sinus using panoramic radiography and cone-beam computed tomography (CBCT).

Materials and methods: A total of 395 maxillary third molars in 234 patients were examined using panoramic radiographs and CBCT images. We examined the eruption level of the maxillary third molars, the available retromolar space, the angulation, the relationship to the second molars, the number of roots, and the relationship between the roots and the sinus.

Results: Females had a higher frequency of maxillary third molars with occlusal planes apical to the cervical line of the second molar (Level C) than males. All third molars with insufficient retromolar space were Level C. The most common angulation was vertical, followed by buccoangular. Almost all of the Level C molars were in contact with the roots of the second molar. Erupted teeth most commonly had three roots, and completely impacted teeth most commonly had one root. The superimposition of one third of the root and the sinus floor was most commonly associated with the sinus floor being located on the buccal side of the root.

Conclusion: Eruption levels were differently distributed according to gender. A statistically significant association was found between the eruption level and the available retromolar space. When panoramic radiographs showed a superimposition of the roots and the sinus floor, expansion of the sinus to the buccal side of the root was generally observed in CBCT images.

No MeSH data available.


Related in: MedlinePlus