Changes in Traditional Bolton’s Ratio With Various Extraction Combinations - An In vitro Study

Kanniyappan, Premalatha; Saravanan, B. C.; Thulasiram, E.

doi:10.13005/bpj/762

Cited by 2 publications

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“…The objective of orthodontic treatment is to obtain optimal overjet and overbite, good aesthetics, good final occlusion, and good stability. One of the factors which plays an important role in achieving the goal is the harmony in the width of maxillary and mandibular mesiodistal teeth [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Premolar Extraction on Bolton Overall Ratio in Class I Malocclusion at RSGMP FKG USU

Nasution¹,

Bahirrah²,

Oeripto³

2018

Proceedings of the International Dental Conference of Sumatera Utara 2017 (IDCSU 2017)

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Abstract-In orthodontics treatment, to obtain a good and stable occlusion, harmony between the combined mesiodistal width of maxillary teeth and that of mandibular teeth must be attempted. Extraction of premolar is routinely carried out as part of orthodontic treatment, but it can lead to the changes of the overall Bolton ratio and the changes are influenced by different extraction combinations. The purpose of this study is to investigate the effects of premolar extraction on the overall Bolton ratio in Class I malocclusion patients. Mesiodistal tooth width of 40 pretreatment dental casts of subjects with Class I malocclusions was measured with 0.01 mm accuracy digital caliper. The overall ratios and tooth-size discrepancies were determined before and after hypothetical premolar extractions. Before and after extractions, the subjects were divided into small, normal, and large overall ratio groups categorized by the Bolton ± standard deviation definition. Extractions were performed in the following combinations: (1) all first premolars, (2) all second premolars, (3) maxillary first and mandibular second premolars, and (4) maxillary second and mandibular first premolars. Statistical evaluations were performed using One-way ANOVA analysis, Wilcoxon Signed Rank test. Results showed that the overall ratios decreased after extraction in any combinations of premolars. The subjects in Bolton small group were still in small group after extractions. Some subjects of the Bolton normal group were then categorized as Bolton normal and Bolton small after extractions. Most subjects of the Bolton large were classified as the Bolton normal group after extractions. It is concluded that the four premolar extraction combinations had significant impact on the overall Bolton ratio; the overall Bolton ratio is decreased after extraction of premolar in any combinations of extraction.

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Section: Introductionmentioning

confidence: 99%

The Effect of Premolar Extraction on Bolton Overall Ratio in Class I Malocclusion at RSGMP FKG USU

Nasution¹,

Bahirrah²,

Oeripto³

2018

Proceedings of the International Dental Conference of Sumatera Utara 2017 (IDCSU 2017)

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“…[ 11 13 14 15 ] Recently, researchers have also focused on other variables influencing satisfactory occlusal relationships such as arch form, maxillary incisor thickness, and incisor inclinations. [ 16 ] Clinically significant TSD can be anticipated in extraction cases as a result of the extraction pattern chosen if due importance was not given to tooth size. The aim of the present study was to identify the consequence of premolar extractions on Bolton's overall ratios in South Indian population and to compare these effects between males and females.…”

Section: Introductionmentioning

confidence: 99%

Outcome of premolar extractions on Bolton's overall ratio and tooth size discrepancies in South India

Varghese

Yerasi

Jose

et al. 2016

J Int Soc Prevent Communit Dent

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Aims and Objectives:Attainment of ideal occlusion is often restricted by disproportionate sizes of individual teeth, which is otherwise termed as tooth size discrepancy (TSD). While extraction of teeth for orthodontic purposes is not uncommon, there is considerable resistance against this school of thought. The extraction of premolars, in particular, received considerable attention because of the potential TSD that could result following the extraction of premolars. The aim of the present study was to identify the consequence of premolar extractions on Bolton's overall ratios in South Indian population.Materials and Methods:One hundred participants were recruited into the study through purposive nonproportionate quota sampling. Pretreatment dental casts of the study participants were measured for mesiodistal tooth widths to determine Bolton's overall ratio before the hypothetical tooth extractions were performed. The hypothetical extractions were executed in four different combinations as follows: (a) Maxillary and mandibular first premolars, (b) maxillary first premolars and mandibular second premolars, (c) maxillary second premolars and mandibular first premolars, and (d) maxillary and mandibular second premolars. Bolton's overall ratios were calculated after the hypothetical tooth extractions were performed. Statistical analysis was done using the Statistical Package for the Social Sciences, version 20 software.Results:It was observed that extractions performed in any of the combinations followed in this study resulted in a decrease of overall Bolton's ratios. However, the discrepancy in tooth size was highest with the extraction of all first premolars, whereas least discrepancy was recorded with all second premolars extraction. It was also found that, based on the combination of teeth chosen for extraction, there was significant difference in Bolton's overall ratios between males and females.Conclusion:In formulating a treatment plan involving premolar extraction, significant tooth size discrepancies could change mutually after extraction.

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Changes in Traditional Bolton’s Ratio With Various Extraction Combinations - An In vitro Study

Cited by 2 publications

References 0 publications

The Effect of Premolar Extraction on Bolton Overall Ratio in Class I Malocclusion at RSGMP FKG USU

The Effect of Premolar Extraction on Bolton Overall Ratio in Class I Malocclusion at RSGMP FKG USU

Outcome of premolar extractions on Bolton's overall ratio and tooth size discrepancies in South India

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