Can crown-root ratio predict premolar eruption?

Rowlands, Paul; Poling, Rebecca; Slater, Dina R.; Hobson, Ross; Steen, Nick

doi:10.1016/j.ajodo.2004.10.013

Cited by 14 publications

(12 citation statements)

References 8 publications

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“…For the premolars, the rate of root formation was more rapid in the middle three quarters of development, around the time of emergence, and in its approach to final position, than it was in early formation. Using the Simpson and Kunos scale, Rowlands et al (2006) found crown length to total length (5 crown length 1 root length) predictive of second premolar eruption timing. Dean (1985) measured the root cone angle by quarters of root development from radiographs of 461 mandibular teeth (N 5 77 individuals).…”

Section: Dental Development Studies: Root Developmentmentioning

confidence: 99%

Growth in root length of the mandibular canine and premolars in a mixed‐longitudinal orthodontic sample

Smith¹,

Buschang²

2009

American J Hum Biol

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Numerous studies of dental development focusing on eruption (clinical emergence) exist in the literature, but fewer studies examine dental development as a process extending across years or decades, and root development is commonly assessed using fractional root lengths. Here, we examine the growth of mandibular canine and premolar roots in a mixed-longitudinal sample of orthodontic patients (77 females and 74 males) from north central Texas. Multilevel models are generated for root lengths as a percentage of total tooth lengths (within films) as well as for absolute root lengths (across films). As a percentage of tooth length, roots grow with decreasing velocity through time between 7 and 14 years of age. More complex patterns appear for absolute growth in root length, with girls showing an earlier maximum growth rate for the canine than for the premolars. Substitution of dental age for chronological age reduces between-subject variation (assessed at age 11), especially for boys. A better understanding of dental maturation, including root length growth, should allow improved prediction models.

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Section: Dental Development Studies: Root Developmentmentioning

confidence: 99%

Growth in root length of the mandibular canine and premolars in a mixed‐longitudinal orthodontic sample

Smith¹,

Buschang²

2009

American J Hum Biol

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“…Another point is that mandibular second premolars are usually the last successor teeth to erupt in the mandible and can determine the beginning of full orthodontic treatment. 14 From the standpoint of the clinician orthodontist, the prediction of the timing of eruption of mandibular second premolars can determine when to install a lingual arch and can decrease the number of appointments before full orthodontic treatment. In this way, the aim of this study was to investigate the relationship between the stages of dental development and the time elapsed until eruption of mandibular second premolars.…”

Section: Introductionmentioning

confidence: 99%

How to predict the timing of eruption of mandibular second premolars

Lima

Schmidt²,

Araújo

et al. 2012

The Angle Orthodontist

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“…19 In another example, a suitable waiting strategy prior to bonding full fixed appliances avoids longer treatment periods. 1 In addition, extractions of second deciduous molars, often required in interceptive guidance of occlusion, produce better results if performed during periods of greater eruption rates of the LPm2. 2,4,20 Eruption rates depend on bone formation as the root grows, space in the dental arch, tooth eruption path, and resorption of the deciduous teeth.…”

Section: Discussionmentioning

confidence: 99%

“…1 Moreover, most of the leeway space in the lower arch is released at exfoliation of the predecessors, the second deciduous molars. 2,3 Comprehensive diagnosis often indicates preservation of the leeway space 3 and/ or extraction of lower deciduous molars to favor development of the dentition.…”

Section: Introductionmentioning

confidence: 99%

“…5 More advanced developmental stages of the LPm2 are significantly correlated with shorter periods until emergence occurs. 1,7 However, beyond the static relationship between stages of tooth development and milestones of the eruption process, estimated eruption rates could determine the ideal time for treatment in each case. Currently, panoramic radiographs and oblique 458 cephalograms are the gold-standard methods of assessment used in most studies 1,4-8 of tooth development and eruption, regardless of image enlargement, distortion, and superimposition of anatomic structures.…”

Section: Introductionmentioning

confidence: 99%

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Eruption rates of lower second premolars at different development stages evaluated with cone-beam computed tomography

Rinaldi

Lima

Menezes

et al. 2016

The Angle Orthodontist

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Objective: To evaluate and compare the eruption rates of lower second premolars (LPm2) at different developmental stages using cone-beam computed tomography (CBCT). Materials and Methods: Retrospectively, 31 individuals (9.77 6 1.25 years) had their LPm2 scored according to the Demirjian method, and afterwards they were split into three groups according to developmental stage, as follows: D ¼ complete-formed crowns; E ¼ root length less than crown height; and F ¼ root length greater than or equal to crown height. Linear distances from the LPm2 crown tip to the anatomical reference line (ARL) and to the occlusal plane line (OPL) were measured in paired CBCT scans (T1, T2), taken with an average interval of 8.6 months between them. Eruption rates (mm/y) were calculated and then compared between groups. Results: Eruption rates were greater for LPm2 at stage F than at stages D or E (P , .01) regardless of whether they were measured from the ARL (D ¼ 2.84 mm/y; E ¼ 2.55 mm/y; F ¼ 5.38 mm/y) or from the OPL (D ¼ 1.82 mm/y; E ¼ 2.02 mm/y; F ¼ 5.26 mm/y). Eruption rates evaluated from the ARL and the OPL had no statistically significant differences (P ¼ .052), and a positive correlation (r ¼ .79, P , .001) between them was observed. Conclusions: LPm2 at Demirjian stage F showed greater eruption rates than at stages D or E, regardless of whether rates were measured from the ARL or the OPL. Faster eruption is expected for LPm2 at stage F. Evaluation of the LPm2's developmental stage using CBCT can aid in clinical decision making regarding the correct timing for intervention. (Angle Orthod. 2017;87:570-575)

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Can crown-root ratio predict premolar eruption?

Cited by 14 publications

References 8 publications

Growth in root length of the mandibular canine and premolars in a mixed‐longitudinal orthodontic sample

Growth in root length of the mandibular canine and premolars in a mixed‐longitudinal orthodontic sample

How to predict the timing of eruption of mandibular second premolars

Eruption rates of lower second premolars at different development stages evaluated with cone-beam computed tomography

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