Abstract
Purpose
Materials and Methods
Results
Conclusion
Figures and Tables
Fig. 1
Eruption levels of maxillary third molars on panoramic radiographs. A. Level A, the occlusal plane of the third molar is at the same level as the adjacent second molar. B. Level B, the occlusal plane of the third molar is between the occlusal plane and the cervical line of the adjacent tooth; C. Level C, the occlusal plane of the third molar is apical to the cervical line of the adjacent tooth.
![isd-45-233-g001](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-g001.jpg)
Fig. 2
Classification of the available retromolar space on panoramic radiographs. A. Sufficient, a space greater than or equal to the mesiodistal length of the third molar; B. Reduced, a space greater than half and less than the mesiodistal length of the third molar; C. Insufficient, a space less than half the mesiodistal length of the third molar.
![isd-45-233-g002](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-g002.jpg)
Fig. 3
The relationship between the root of the maxillary third molars and the sinus on panoramic radiographs. A. Class 1, the sinus floor is above the roots. B. Class 2, the sinus floor touches the root tips. C. Class 3, the sinus floor is superimposed on up to one third the root. D. Class 4, the sinus floor is superimposed on up to two thirds of the root. E. Class 5, the sinus floor extends up to the tooth cervix.
![isd-45-233-g003](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-g003.jpg)
Fig. 4
Classification of the angulation of the maxillary third molars on cone-beam computed tomography images. V, vertical; B, buccoangular; L, linguoangular; BL, buccolingual; M, mesioangular; D, distoangular; H, horizontal; I, inverted.
![isd-45-233-g004](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-g004.jpg)
Fig. 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.
![isd-45-233-g005](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-g005.jpg)
Table 1
Comparison of the eruption levels of the maxillary third molars between genders
![isd-45-233-i001](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-i001.jpg)
Level A: the occlusal plane of the third molar is at the same level as the adjacent second molar, Level B: the occlusal plane of the third molar is between the occlusal plane and the cervical line of the adjacent tooth, Level C: the occlusal plane of the third molar is apical to the cervical line of the adjacent tooth. P<0.01, chi-square test.
Table 4
Eruption levels of the maxillary third molars according to their relationship to the second molar
![isd-45-233-i004](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-i004.jpg)
Table 5
Relationship between the number of roots and the eruption level of the maxillary third molars
![isd-45-233-i005](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-i005.jpg)
Table 6
Relation of the maxillary third molars to the maxillary sinus according to eruption level
![isd-45-233-i006](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-i006.jpg)
Class 1: sinus floor is above the roots, Class 2: sinus floor touches the root tips, Class 3: sinus floor is superimposed on up to one third of the root, Class 4: sinus floor is superimposed on up to two thirds of the root, Class 5: sinus floor extends up to the tooth cervix. P<0.01, chi-square test.
Table 7
The horizontal relationship between the maxillary third molars and the maxillary sinus according to the extension of the maxillary sinus on panoramic radiographs
![isd-45-233-i007](/upload/SynapseData/ArticleImage/2080isd/isd-45-233-i007.jpg)
Type B: the lowest point of the 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 is located on the palatal side of the root, Type M: the lowest point of the sinus is located on the mesial side of the third molar, Type D: the lowest point of the sinus is located on the distal side.
References
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