engleski

Orientation of craniofacial planes to gravity horizontal plane

Introduction: Orientation planes for mounting models in articulators are thought to be parallel with real horizontal plane. Aim of the study: To measure inclination between craniofacial planes and real gravity horizontal plane. Materials and Methods: Fifty six dental students with complete natural dentition and Angle Class I participated. Left profiles and an-face photographs with a subject in a natural head position and clenching on a Fox plane were obtained from a distance of 1.5 m. A plumb line was pending from the ceiling to identify gravity vector (true vertical). Perpendicular line to a true vertical line was drown on digital photographs (true horizontal) and inclinations between Frankfort horizontal plane and true horizontal, between Camper's line and true horizontal, between Fox plane and and true horizontal and inclination between bipupilar line and true horizontal were measured. Statistical analysis (descriptives, t test) was made using SPSS 12 for Windows. Results: Mean values between bipupilar line and true horizontal was: x= -.25± ; ; ; 1.94 degrees and no significant difference was observed (t= 0.96 ; P=0.39, NS). Mean difference between Camper's line and true horizontal was: x= 5.53± ; ; ; 7.68 degrees and the difference was statistically significant (t= 5.39 ; P<0.001). Mean difference between Frankfort horizontal plane and true horizontal was: x= - 10.33 ± ; ; ; 7.68 degrees and the difference was statistically significant (t= -11.62 ; P<0.001). Mean difference between Fox (occlusal) plane and true horizontal plane was: x= 1.42 ± ; ; ; 5.56 degrees and the difference was not statistically significant (t= 1.9 ; P<0.061). Conclusion: Occlusal plane (Fox plane) and bipupilar plane are almost parallel to gravity horizontal plane in natural head position ; Not only that planes of orientation, such as Frankfort horizontal plane and Camper’ s line are not parallel to gravity horizontal plane during natural head position, but are not parallel to the occlusal plane, as well.

craniofacial planes; Fox plane; gravity horizontal plane; inclination

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