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Anatomy and Embryology of the Mouth and Dentition
Published in John C Watkinson, Raymond W Clarke, Terry M Jones, Vinidh Paleri, Nicholas White, Tim Woolford, Head & Neck Surgery Plastic Surgery, 2018
Behind the canines are two premolars, each with a buccal and lingual cusp (hence the term bicuspid). The occlusal surfaces of the maxillary premolars are oval (the long axis is buccopalatal) with a mesiodistal fissure separating the two cusps. The maxillary first premolar usually has two roots (one buccal, one palatal). The maxillary second premolar usually has one root. The occlusal surfaces of the mandibular premolars are more circular or squarer than those of the uppers. The buccal cusp of the mandibular first premolar towers above the very much reduced lingual cusp. In the mandibular second premolar, the lingual cusp is more substantial compared with the first, and frequently presents as two cusps. Each lower premolar tooth generally has one root.
Fixed prosthodontics—clinical vs pre-clinical practice
Published in R.M. Natal Jorge, J.C. Reis Campos, Mário A.P. Vaz, Sónia M. Santos, João Manuel R.S. Tavares, Biodental Engineering IV, 2017
Carlos Ferreira Almeida, Rui Machado, Orlando F. Lino, César Silva, João Carlos Sampaio-Fernandes
Al-Rafee et al. and Leempoel et al., in studies regarding bridges conducted in Saud Arabia and The Netherlands, respectively, reported that more bridges were placed in the maxilla, and that lower first molars were the teeth that needed to be replaced most often. The most common places for abutments were the maxillary second premolars and the mandibular second premolars and second molars (Al-Rafee et al., 1996; Leempoel et al., 1989).
Cysts of the jaws, face and neck
Published in John Dudley Langdon, Mohan Francis Patel, Robert Andrew Ord, Peter Brennan, Operative Oral and Maxillofacial Surgery, 2017
Dentigerous cysts of the jaws develop in association with impacted teeth, most commonly mandibular third molars. Maxillary third molars, maxillary canines and mandibular second premolars are also observed to be associated with dentigerous cysts. They may also occur in association with supernumerary teeth and odontomas; however, they are only rarely associated with primary teeth.1, 2 Although dentigerous cysts occur over a wide age range, they are most commonly seen in patients between the ages of 10 and 30 years. Many dentigerous cysts are small asymptomatic lesions that are discovered serendipitously on routine radiographs, although some may enlarge to considerable size thereby causing bony expansion.
Association between dental and skeletal maturation in Scandinavian children born between 2005 and 2010
Published in Acta Odontologica Scandinavica, 2023
Astrid Rathcke Poulsen, Liselotte Sonnesen
Based on Demirjian’s method, the mandibular second premolar in the DM stage F was significantly positively associated with the SM stage PP2= or S when adjusted for age and sex (p < .05, highlighted in Table 3). This indicates that when the roots of the mandibular second premolars are ¾ formed or have similar length as the crown (DM stage F), this is either significantly associated with the beginning of the adolescent period (SM stage PP2=) or with the period shortly before PHV (SM stage S, approx. 1 year according to [1], Figure 2).
Lingual orthodontic treatment of a skeletal class II patient with miniscrew-assisted absolute anchorage in maxillary arch and total distalization in mandibular arch: a case report
Published in Orthodontic Waves, 2021
Nguyen Viet Anh, Nguyen Thu Tra, Nguyen Thi Thuy Hanh
Intraorally, the patient had an end-on Class II molar relationship and full Class II canine relationship on both sides. The patient had excessive overjet of 10.0 mm and deep overbite of 5.2 mm (75%). The upper arch form was tapered and slightly narrow. The mandibular second premolars were lingually placed. There was mild crowding in both arches with deep Curve of Spee in the lower arch (Figure 2). The upper midline was coincident with the facial midline, but the lower dental midline was deviated 3 mm to the right side.
The importance of controlling vertical movement of posterior teeth for a Class II malocclusion in a non-growing patient: a case report
Published in Orthodontic Waves, 2021
Preeya Suwanwitid, Tanan Jaruprakorn, Chidsanu Changsiripun
Two reasonable treatment options were presented to this patient. Option one recommended correcting the listed problems with dental extractions of two maxillary first premolars with or without two mandibular second premolars, but this option could lead to an increased flattening of the facial profile and root resorption [7].