Tayyaba Bibi, Ahsan Mahmood Shah.
Correlation Between Curve Of SPEE And Vertical Eruption Of Teeth Among Various Groups Of Malocclusion.
Pak Oral Dental J Jan ;37(1):66-9.

The aim of this study was to determine the depth of curve of Spee (COS) in different types of malocclusion and find a relationship between depth of COS and vertical eruption of anterior or posterior teeth. The study was conducted at Department of Orthodontics, Khyber College of Dentistry using the record of 120 patients in the form of lateral cephalograms and dental casts. The patients were divided into 4 equal groups (30 each) based on dental malocclusion as class I, class II div 1, class II div2 and class III. The depth of COS was measured for each group using a flat plane touching the incisors anteriorly and distal marginal ridges of posterior teeth on mandibular cast. On lateral cephalograms, perpendicular distances from the incisal tip of mandibular central incisor (L1-MP), the deepest point of COS (S-MP) and distobuccal cusp tip of mandibular second molar (L7-MP) to mandibualr plane (MP) were measured and proportioned as L1-MP/S-MP and L7-MP/S-MP. Pearson correlation was used to assess the relationship between COS and L1-MP/S-MP and L7-MP/S-MP. The second premolar cusp tip was the deepest point of COS in all groups with the maximum depth of 2.80 ± 0.417mm in Class II div2 and minimum depth of 1.40 ± 0.693mm in Class I malocclusion. Significant positive correlations were found between depth of COS and LI-MP/S-MP for Class I (r =0.670) and Class III (r =0.267) groups while L7-MP/S-MP was significant for Class II div 2 (r =0.235). It was concluded that depth of COS is affected by vertical eruption of anterior teeth in class I and Class III malocclusion while posterior teeth eruption significantly contributed in Class II div 2.

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