[A study of Bolton tooth-size discrepancies of malocclusion patients]

Full Abstract

OBJECTIVE: To analysis the sum and frequencies of Bolton tooth-size discrepancies Angle Class I, II, III malocclusion patients. METHODS: Measured each tooth crown mesial-distal size between the first molar of 439 dental plaster casts of malocclusion patients and obtained the sums of six anterior tooth-size and twelve tooth-size between the first molar of upper or lower and calculated the anterior and total tooth-size discrepancies by Bolton rate standards, then statistic analyses were done. RESULTS: Patients whose sums of anterior tooth-size discrepancy were pass 1.5 mm or less than -1.5 mm was 14.02% in Angle Class I malocclusion patients and 9.49% in Class II and 19.32% in Class III. Patients whose sums of total tooth-size discrepancy were pass 1.5 mm or less than -1.5 mm was 19.63% in Angle Class I malocclusion patients and 15.33% in Class II and 20.45% in Class III. The upper sum of anterior tooth-size of Class I malocclusion patients whose sums of anterior tooth-size discrepancies were pass 1.5 mm or less than -1.5 mm was always smaller than normal and the lower sum was always larger. The sums of anterior tooth-size discrepancy of Class I, II, III and total tooth-size discrepancy of Class I were always between 1.5 mm-2.5 mm or -2.5 mm(-)-1.5 mm. Patients whose sums of anterior tooth-size discrepancy were pass 3.5 mm or less than -3.5 mm was 2.34% in Class I malocclusion patients and 0 in class II and 0 in class III. Patients whose sums of total tooth-size discrepancy were pass 3.5 mm or less than -3.5 mm was 4.21% in Class I and 1.46% in Class II and 4.54% in Class III. CONCLUSION: Tooth-size discrepancy of malocclusion patients was not the general cause of malocclusion.

Author information

Author/s: Huang, Minfang (M);

Affiliation: Department of Stomatology, People's Hospital of Guangxi Zhuang Autonomous Region, Nanning 530021, China.

Journal and publication information

Publication Type: English Abstract; Journal Article

Journal: Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology (Hua Xi Kou Qiang Yi Xue Za Zhi), published in China. (Language: chi)

Reference: 2003-Jun; vol 21 (issue 3) : pp 211-2, 216

Dates: Created 2003/08/05; Completed 2004/07/22; Revised 2006/11/15;

PMID: 12898766, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

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