Duration and rate of clinical eruption of third molars

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Objectives: The aim of the current paper was to present norms of clinical duration and rate of eruption for upper and lower 3rd molars utilizing recently published data for a Jordanian population.
Methods: Duration of Clinical Eruption (CDE) in years and Clinical Eruption Rates (CER) in mm/year were calculated from recently published median ages at emergence and functional eruption of 3rd molars for a Jordanian population.
Results: Third molars clinically erupt at a rate between 1.45 to 1.85 mm/year, being slightly faster in the lower jaw. The average CDEs were 2.95 and 2.75 years for upper and lower 3rd molars respectively. Upper 3rd molars of males needed a slightly longer CDE than lower 3rd molars did while, in females, there was no difference in CDE across arches. The average CERs were 1.53 and 1.82 mm/year for upper and lower 3rd molars respectively. In contrast to males, females exhibited slightly faster CER for the upper 3rd molar and slightly slower CER for the lower 3rd molar. CERs are steadier and more linear in the upper than in the lower 3rd molar.
Conclusions: This study has reported the first norms of duration and rate of clinical eruption specific to upper and lower 3rd molars. Normally, third molars remain around 3 years in clinical eruption, which render them more vulnerable to recurrent pericoronitis and other local pathologies than the rest of the teeth. The availability of these norms will help dentists and auxiliaries identify and diagnose delayed and slow eruption cases and make their clinical decision upon removing or keeping 3rd molars.
Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalDental Oral Biology and Craniofacial Research
Issue number1
Publication statusPublished - 26 Feb 2019


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