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2017•The Angle OrthodontistOpen access

Buccolingual inclination of first molars in untreated adults: A CBCT study

Rola Alkhatib, Chun‐Hsi Chung

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Abstract

OBJECTIVE: To evaluate the buccolingual inclinations of maxillary and mandibular first molars in untreated adults. MATERIALS AND METHODS: Fifty-nine subjects (14 males and 45 females; mean age, 41.2 years) with no missing teeth, no crossbite, and minimal crowding were included. For each subject, a CBCT was taken. The long axis of each first molar was determined, and the inclination of each molar was measured using the long axis and the floor. RESULTS: One hundred seventeen out of 118 mandibular first molars measured had a lingual inclination, with a mean of 12.59° ± 5.47°. For the maxillary first molars, 107 out of 118 had a buccal inclination, with a mean of 4.85° ± 4.22°. CONCLUSIONS: There is a curvature to the inclinations of first molars in untreated adults, where the maxillary molars have a slight buccal inclination and mandibular molars have a slight lingual inclination.

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OBJECTIVE: To evaluate the buccolingual inclinations of maxillary and mandibular first molars in untreated adults. MATERIALS AND METHODS: Fifty-nine subjects (14 males and 45 females; mean age, 41.2 years) with no missing teeth, no crossbite, and minimal crowding were included. For each subject, a CBCT was taken. The long axis of each first molar was determined, and the inclination of each molar was measured using the long axis and the floor. RESULTS: One hundred seventeen out of 118 mandibular first molars measured had a lingual inclination, with a mean of 12.59° ± 5.47°. For the maxillary first molars, 107 out of 118 had a buccal inclination, with a mean of 4.85° ± 4.22°. CONCLUSIONS: There is a curvature to the inclinations of first molars in untreated adults, where the maxillary molars have a slight buccal inclination and mandibular molars have a slight lingual inclination.

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Available abstract

OBJECTIVE: To evaluate the buccolingual inclinations of maxillary and mandibular first molars in untreated adults. MATERIALS AND METHODS: Fifty-nine subjects (14 males and 45 females; mean age, 41.2 years) with no missing teeth, no crossbite, and minimal crowding were included. For each subject, a CBCT was taken. The long axis of each first molar was determined, and the inclination of each molar was measured using the long axis and the floor. RESULTS: One hundred seventeen out of 118 mandibular first molars measured had a lingual inclination, with a mean of 12.59° ± 5.47°. For the maxillary first molars, 107 out of 118 had a buccal inclination, with a mean of 4.85° ± 4.22°. CONCLUSIONS: There is a curvature to the inclinations of first molars in untreated adults, where the maxillary molars have a slight buccal inclination and mandibular molars have a slight lingual inclination.

Key concepts: Molar, Orthodontics, Medicine, Dentistry, Mandibular first molar, Mandibular second molar

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