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Year : 2015  |  Volume : 3  |  Issue : 3  |  Page : 188-191

Seventh key of occlusion: Diagnostic significance in different angle's class I, II and III malocclusions

1 Department of Orthodontics, Corps Dental Unit, Bhopal, Madhya Pradesh, India
2 Department of Orthodontics, IDS, Bareily, Uttar Pradesh, India
3 Department of Periodontics, IDS, Bareily, Uttar Pradesh, India
4 Department of Orthodontics, Ashok Dental Hospital, Mumbai, Maharashtra, India

Correspondence Address:
Rajkumar Maurya
Corps Dental Unit, Bhopal Military Station, Bhopal, Madhya Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2321-3825.155991

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Introduction: As significant tooth size discrepancies prevent an ideal occlusion being produced at the end of orthodontic treatment, absence of a tooth size discrepancy is the seventh "key" for an ideal occlusion. Present study aimed to assess diagnostic reliability of Bolton's ratio for different Angle's malocclusion. Materials and Methods: The study models of 144 patients were divided in three groups based on malocclusion.The mesiodistal tooth width from permanent first molar to first molar were measured on the orthodontic study models. The readings were obtained using a digital vernier caliper to the nearest 0.01mm, with the blades of the caliper held perpendicular to the long axis of the tooth. Results: ANOVA showed no significant difference between all groups except between anterior ratio of Class II group. The mean ratio for the Class III sample was significantly greater than Class I and Class II subjects (P < 0.05). The overall ratio was significantly larger for the Class III subjects than other groups, but with no significance for either gender. Regarding absolute values, mean overall ratio for the different groups was in the order Class III > Class I > Class II with significant difference between the Class I and Class II groups. Conclusion: Subjects with Class III group had a significantly greater prevalence of tooth size discrepancies than Class I and Class II group. Statistically significant difference was seen in the anterior ratio between the males and females of Class II malocclusion and no significant difference between other groups.

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