The Ricketts Line is an assessment tool now used in the clinic by to assess ideal proportions of the lower face. It is extremely useful, specifically for the proportion of the lips in relation to the nose and chin in the overall aesthetic of the face.
What is the esthetic line?
The esthetic line is a line to connect from the tip of the nose to the protruding point of the lower jaw when looking from the side face. For Japanese, it is said that it would be esthetic if the upper lip and lower lip are located 2mm inside from the esthetic line, but typical Japanese lips touch the E-line.
What is esthetic plane?
Fundamentally the “E” plane is simply a line drawn from the tip of the nose to the tip of the chin. His key assessment was to look at how the upper and lower lip related to that line.
What is Ricketts esthetic plane?
Ricketts, who was concerned that dental practitioners were potentially making the aesthetic appearance of some patients worse by not paying attention to what he called the “Esthetic Plane” or “E” plane. Essentially, the “E” plane is simply a line drawn from the tip of the nose to the tip of the chin.
What is yen angle?
Subjects with a YEN angle between 117 and 123 degrees have a skeletal Class I pattern. With an angle less than 117 degrees, patients are considered to have a skeletal Class II relationship, and with an angle greater than 123 degrees, patients have a skeletal Class III.
What is the ideal curve of Spee?
The Curve of Spee is basically a part of a circle (8-inch diameter) which has its circumference as the anterior ramus of mandible. Ideally, it is aligned so that a continuation of this arc would extend through the condyles. The curvature of this arc would relate, on average, to part of a circle with a 4-inch radius.
How do you find the curve of Spee?
The depth of curve of Spee was measured as the perpendicular distance between the deepest cusp tip and a flat plane that was laid on the top of the mandibular dental cast, touching the incisal edges of the central incisors and the distal cusp tips of the most posterior teeth in the lower arch [Figure 1].
What is mandibular plane angle?
The Frankfort-mandibular plane angle (FMA) is formed by the intersection of the Frankfort horizontal plane and the mandibular plane. This angle can be traced and measured by means of a diagnostic overlay. A high-angle patient has an FMA of 30 degrees or more, and a low-angle patient has an FMA of 20 degrees or less.
How is Wits appraisal calculated?
The “Wits” appraisal of jaw disharmony is a simple method whereby the severity or degree of anteroposterior jaw dysplasia may be measured on a lateral cephalometric head film. The method entails drawing perpendiculars from points A and B on the maxilla and mandible, respectively, onto the occlusal plane.
