Tooth extractions in Orthodontics: first or second premolars?

Araújo, Telma Martins de; Caldas, Luciana Duarte

doi:10.1590/2177-6709.24.3.088-098.bbo

Cited by 23 publications

(14 citation statements)

References 30 publications

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“… 3 The maximum anchorage can be accomplished with skeletal anchorage devices, such as mini-implants and miniplates, or intraoral appliances such as Nance appliances. 4 Previous studies have found that the extraction of four bicuspids resulted in improved dental characteristics associated with BP. Additionally, a study observed an improvement in lip protrusion following extraction with maximum anchorage space closure.…”

Section: Introductionmentioning

confidence: 97%

Comparison of anterior maxillary and mandibular alveolar parameters in African American and Caucasian women: A retrospective pilot study

Renaud¹,

Gandhi

West³

et al. 2021

Imaging Sci Dent

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Purpose The primary objective of this study was to analyze the thickness and height of alveolar bone around the maxillary and mandibular incisors. Additionally, this study aimed to compare bone parameters between Caucasian (CC) and African American (AA) female patients. Materials and Methods In this retrospective pilot study, 50 female subjects (25 CC and 25 AA) were included. The inclusion criteria were AA or CC women between the ages of 18 and 50 with a normo-divergent facial pattern and Angle's class I, end-on class II, or mild class III malocclusion. The distance from the cementoenamel junction (CEJ) to the buccal and lingual alveolar crest; the alveolar ridge thickness at the mid-root and apex; and the buccal and lingual bone thickness at 3, 6, and 9 mm from the CEJ were measured. Results No significant difference was found ( P >0.05) in the cortical bone thickness at 3 mm, 6 mm, or 9 mm from the alveolar crest between CC and AA populations for most measurements. A significant difference in bone thickness was found ( P <0.05) for the lingual surface of the central incisor, with maxillary bone thickness found to be higher than mandibular bone thickness. The measurements of lingual thickness were larger than those of buccal thickness for both races. Conclusion There were no differences in maxillomandibular anterior alveolar bone measurements between normo-divergent adult AA and CC women, except for a few parameters at varying locations. However, future studies can be planned based the current pilot study data, which may provide valuable information.

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Section: Introductionmentioning

confidence: 97%

Comparison of anterior maxillary and mandibular alveolar parameters in African American and Caucasian women: A retrospective pilot study

Renaud¹,

Gandhi

West³

et al. 2021

Imaging Sci Dent

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“…Maxillary 1 st premolars are most common tooth to extract for orthodontic treatment purpose because of their position and compatible size with most types of discrepancies in cases that require the retraction of anterior teeth. 1 Consistent coronal description of this tooth is well explained in literature, but variation in root morphology is evident among various populations, with a higher incidence, which makes this tooth quite distinctive. 2 Its variation of root morphology has been a topic of interest, it has been studied among various Asian populations, like East-Asian (Chinese) 3 , South-Asian (Nepalese) 4 , South-East Asian (Singaporean) 5 and West-Asian (Saudia Arabia and Jordanian) 6,7 along with Africans and Europeans.…”

Section: Introductionmentioning

confidence: 70%

“…One of the first orthodontists to indicate permanent tooth extractions for correction of malocclusions was Charles Tweed, who found that only 20% of his clinical cases treated without extractions were successful. 1 It is clearly evident that extractions are inevitable in most of orthodontic treatment cases.…”

Section: Introductionmentioning

confidence: 99%

Root morphology of maxillary 1st premolar teeth in orthodontic extraction cases presenting in a tertiary care hospital: Taxilla Cantt.

Siddiq

Shakeel

Khan

et al. 2021

TPMJ

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Objective: To observe pattern and variation of root morphology of maxillary 1st premolar teeth in orthodontic extraction cases among local population. Study Design: Prospective Observational study. Setting: Dental College-HITEC Institute of Medical Sciences-Taxilla Cantt. Period: 1st January 2017 to 31st December 2019. Material & Methods: A total of 120 patients and 320 maxillary 1st premolars were studied clinically for gross root morphology after orthodontic tooth extraction, variation of gross root morphology was studied among extracted teeth, frequency distribution was observed on basis of gender and both quadrants in each patient, a critical analysis is also made about variation of root morphology among various populations across the world. Result: Out of 160 patients, 49 were males and 111 were females. 151 patients had bilateral similar root morphology, out of 320 clinically examined teeth 206 had two roots, and 123 teeth had fused root morphology, 83 teeth had two bifurcated (separate) roots while 114 teeth were single rooted. Conclusion: Maxillary 1st premolar is unique in terms of wide variation in root morphology which is evident among various population studies. Two roots with fused root morphology is most prevalent in Pakistani population.

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“…It is generally known that the extraction of four premolars, especially the first ones, creates spaces to straighten and retract the anterior teeth. This approach allows correction of dentoalveolar protrusion, and therefore leads to improvement of facial balance [ 27 , 28 , 29 ]. Contini et al [ 30 ] indicated that the facial balance is not only affected by orthodontic treatment, but also by facial growth.…”

Section: Discussionmentioning

confidence: 99%

Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics

Derwich¹,

Minch²,

Mituś-Kenig

et al. 2021

JPM

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Background: One of the goals of orthodontic treatment is to obtain maximum facial harmony. The sagittal position of the lower incisors plays a significant role in the planning of orthodontic treatment. The aim of the study was to evaluate the relationship between the sagittal position of lower incisors and facial profile esthetics with reference to the skeletal vertical dimension. Methods: There were 200 patients included in the study. Patients were allocated into three groups, depending on the vertical growth pattern: normal-angle, low-angle, and high-angle cases. Tweed–Merrifield cephalometric analysis was used to assess the sagittal and vertical position of the mandible, as well as to assess the sagittal position of the lower incisors. Results: Z-angle and Frankfort mandibular incisor plane angle (FMIA) decreased significantly (p < 0.001) with the increase of the skeletal vertical dimension. Incisor mandibular plane angle (IMPA) was significantly higher (p < 0.001) in low-angle patients compared to the high-angle ones. Z-angle appeared to be the most accurate parameter (area under curve, AUC = 0.957) describing patients with a convex profile. The cutoff value of Z-angle 68.0° was characterized by the sensitivity of 94.1% and the specificity of 84.3%. Conclusions: The sagittal position of the lower incisors significantly affects the facial profile convexity. The Z-angle is the parameter which most accurately describes the patients with a convex profile.

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Tooth extractions in Orthodontics: first or second premolars?

Cited by 23 publications

References 30 publications

Comparison of anterior maxillary and mandibular alveolar parameters in African American and Caucasian women: A retrospective pilot study

Comparison of anterior maxillary and mandibular alveolar parameters in African American and Caucasian women: A retrospective pilot study

Root morphology of maxillary 1st premolar teeth in orthodontic extraction cases presenting in a tertiary care hospital: Taxilla Cantt.

Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics

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