Table 7 Comparison of current study with other studies
Project | Object | Sample number | Vertical relationship between the roots of the maxillary molar and the MSF | Distance between the root apices and the MSF | MSF thickness of the cortical bone closest to root apices | MSF thickness of the mucosa closest to root apices | Apical protrusion over the inferior wall of the sinus | The angle between the buccal and palatal roots of the maxillary molar |
|---|---|---|---|---|---|---|---|---|
Current study | Chinese populaion | 200 patients | The most common relationship was the MSF above the connection of the buccal and palatal root apices for first and second molar. | The shortest were observed at the mesiobuccal root of the left second molar, 1.57 ± 3.33 mm. | The thinnest were observed at the mesiobuccal root of the right second molar, 0.46 ± 0.28 mm. | The thinnest were observed at the distobuccal root of the right second molar,1.52 ± 0.85 mm. | It was most often occurred in the mesiobuccal root of left second molar (frequency, 20.5%). | The largest was observed in the right first molar (56.47 ± 29.30) when the MSF is located above the connection between the buccal and palatal root apices. |
Estrela et al .[7] | Brazilian population | 202 patients | The most common relationship was the MSF located below the level connecting the buccal and palatal root apices without an apical protrusion over the MSF for first and second molar. | The shortest were observed at the mesiobuccal root of the second molar, 0.36 ± 1.17 mm. | The thinnest were observed at the mesiobuccal root of the left second molar, 0.65 ± 0.41 mm. | NA | It was most often occurred in the second molar (frequency, 40%). | NA |
Razumova et al .[13] | Russian population | 325 patients | The most common relationship was MSF located below the level connecting the buccal and palatal root apices without an apical protrusion over the MSF for first and second | NA | The thinnest were observed at the mesiobuccal root of the second molar, 0.54 ± 1.19 mm. | NA | NA | NA |
Yurdabakan et al .[14] | Turkish population | 394 patients | The most common relationship was the MSF above the connection of the buccal and palatal root apices for the third molar. | NA | NA | NA | The frequency of maxillary third molar protusion into the MSF was 40.4%. | NA |