522
Radiology forum
ORAL SLRC ORAL MED ORAL PATHOL April 199I
causethe unerupted molar was entirely asymptomatic, we recommendedno treatment except periodic observation. After a l-year follow-up, the patient still has no symptoms and no radiographic change was apparent (Fig. 3). Gerry M. Raghoebar, DDS Geert Boering, DDS, PhD Department of Oral and Maxillofacial Surgery University Hospital Groningen P.O. Box 30.001 9700 RB Groningen, The Netherlands REFERENCES
1. Pindborg JJ. Pathology of the dental hard tissues. Copenhagen: Munksgaard, 1970:241. 2. Tsukamoto S, Braham RL. Unerupted secondprimary molar positioned inferior to the second premolar: clinical report. J Dent Child 1986;53:67-9. Fig. 3. Periapical radiograph molar after I -year follow-up.
ECTOPIC
of unerupted
deciduous
THIRD MOLAR
U
nilateral or bilateral ectopic impacted third molar teeth have been reported in various parts of the mandibular ramus. Aroche and coworkers’ refer to an ectopic third molar located in the medial subcondylar region of the mandibular ramus. An inverted, enclosedthird molar in the region of the mandibular condyle has been described by Srivastava and
Sinah. Bilateral ectopy of impacted mandibular third molars in the outer surface of the mandibuIar ramus was reported by Markowitz and coworkers.3 Eighty skulls with mandibles from the skull collection of the Department of Anatomy, University of Athens, and 400 skulls from the Terry Collection of the Smithsonian Institution anthropological department, were examined for the localization of ectopic teeth or any other dental abnormalities. In one mandible a third molar had erupted into the medial surface of the coronoid process of the right
Fig. 1. Third molar in medial surface of coronoid process. Inset (center) demonstrates degree of eruption.
Fig. 2. A panoramic third molar teeth.
radiograph
showing the ectopic
Radiology forum
Volume 7 I Number 4
mandibular ramus (Fig. 1). The tooth was 21 mm from the top of the coronoid processand 55 mm from the lower border of the mandibular angle. The crown of the tooth was well developed and three-fourths erupted. Panoramic radiography showed two wellformed roots that were not in relation to the mandibular canal (Fig. 2). No other significant abnormalities were observed either macroscopically or radiographically. Although clinical signs, if any, are not known in this case, the anatomic relations of the ectopic third molar might press and irritate the attachment fibers of the temporalis muscle and the oral mucosa during mastication. Temporal and buccal mucous membranes are innervated by branches of the trigeminal nerve. Symptoms during masticatory movements
MAXILLARY
523
might therefore include diffuse pain in the homolatera1temporomandibular region. Sophia Anagnostopoulou Department of Anatomy Athens University School of Medicine 5 Acronos St. Pangrati 11633 Athens, Greece REFERENCES
Aroche S, Fujikami TK, Lavalle SS. Ectopic molar inclusion in the internal subcondylar region. ADM 1981;38:76-9. Srivastava RP, Sinah G. An unusual impacted inverted molar in mandibular condyle with preauricular sinus (a casereport). J Indian Dent Assoc 1982;54:67-9. Markowitz NR, Wolford DG, Harrington WS, Monaco F. Bilateral vertical impacted third molars of the midramus. ORAL SURG ORAL MED ORAL PATHOL
1979;47: 107.
INCISOR DUPLICATION
A
healthy IO-year-old white boy was seen at the dental clinic for a complaint that his “front teeth” had not yet erupted. A clinical examination showed the presence of the right and left maxillary primary central incisors, as well as the right and left permanent lateral incisors. The crown portion of the maxillary permanent central incisors could be palpated through the gingiva. A maxillary occlusal radiograph (Fig. 1) showed the presenceof multiple maxillary central incisors, as well as the presenceof a supernumerary tooth located in the palate. Planned treatment consists of extracting the pala-
Fig.
tal supernumerary tooth and selecting which maxillary incisors to extract and retain. It is hoped that the two retained incisors will erupt and continue to develop normally. Robert Steelman, DMD Carolyn Wilson, DDS, MSD Steven Nelson, DDS Department of Pediatric Dentistry and Oral and Maxillofacial Surgery Baylor College of Dentistry 3302 Gaston Ave. Dallas, TX 75246
1.
Radiology forum
ORAL SLRC ORAL MED ORAL PATHOL April 199I
causethe unerupted molar was entirely asymptomatic, we recommendedno treatment except periodic observation. After a l-year follow-up, the patient still has no symptoms and no radiographic change was apparent (Fig. 3). Gerry M. Raghoebar, DDS Geert Boering, DDS, PhD Department of Oral and Maxillofacial Surgery University Hospital Groningen P.O. Box 30.001 9700 RB Groningen, The Netherlands REFERENCES
1. Pindborg JJ. Pathology of the dental hard tissues. Copenhagen: Munksgaard, 1970:241. 2. Tsukamoto S, Braham RL. Unerupted secondprimary molar positioned inferior to the second premolar: clinical report. J Dent Child 1986;53:67-9. Fig. 3. Periapical radiograph molar after I -year follow-up.
ECTOPIC
of unerupted
deciduous
THIRD MOLAR
U
nilateral or bilateral ectopic impacted third molar teeth have been reported in various parts of the mandibular ramus. Aroche and coworkers’ refer to an ectopic third molar located in the medial subcondylar region of the mandibular ramus. An inverted, enclosedthird molar in the region of the mandibular condyle has been described by Srivastava and
Sinah. Bilateral ectopy of impacted mandibular third molars in the outer surface of the mandibuIar ramus was reported by Markowitz and coworkers.3 Eighty skulls with mandibles from the skull collection of the Department of Anatomy, University of Athens, and 400 skulls from the Terry Collection of the Smithsonian Institution anthropological department, were examined for the localization of ectopic teeth or any other dental abnormalities. In one mandible a third molar had erupted into the medial surface of the coronoid process of the right
Fig. 1. Third molar in medial surface of coronoid process. Inset (center) demonstrates degree of eruption.
Fig. 2. A panoramic third molar teeth.
radiograph
showing the ectopic
Radiology forum
Volume 7 I Number 4
mandibular ramus (Fig. 1). The tooth was 21 mm from the top of the coronoid processand 55 mm from the lower border of the mandibular angle. The crown of the tooth was well developed and three-fourths erupted. Panoramic radiography showed two wellformed roots that were not in relation to the mandibular canal (Fig. 2). No other significant abnormalities were observed either macroscopically or radiographically. Although clinical signs, if any, are not known in this case, the anatomic relations of the ectopic third molar might press and irritate the attachment fibers of the temporalis muscle and the oral mucosa during mastication. Temporal and buccal mucous membranes are innervated by branches of the trigeminal nerve. Symptoms during masticatory movements
MAXILLARY
523
might therefore include diffuse pain in the homolatera1temporomandibular region. Sophia Anagnostopoulou Department of Anatomy Athens University School of Medicine 5 Acronos St. Pangrati 11633 Athens, Greece REFERENCES
Aroche S, Fujikami TK, Lavalle SS. Ectopic molar inclusion in the internal subcondylar region. ADM 1981;38:76-9. Srivastava RP, Sinah G. An unusual impacted inverted molar in mandibular condyle with preauricular sinus (a casereport). J Indian Dent Assoc 1982;54:67-9. Markowitz NR, Wolford DG, Harrington WS, Monaco F. Bilateral vertical impacted third molars of the midramus. ORAL SURG ORAL MED ORAL PATHOL
1979;47: 107.
INCISOR DUPLICATION
A
healthy IO-year-old white boy was seen at the dental clinic for a complaint that his “front teeth” had not yet erupted. A clinical examination showed the presence of the right and left maxillary primary central incisors, as well as the right and left permanent lateral incisors. The crown portion of the maxillary permanent central incisors could be palpated through the gingiva. A maxillary occlusal radiograph (Fig. 1) showed the presenceof multiple maxillary central incisors, as well as the presenceof a supernumerary tooth located in the palate. Planned treatment consists of extracting the pala-
Fig.
tal supernumerary tooth and selecting which maxillary incisors to extract and retain. It is hoped that the two retained incisors will erupt and continue to develop normally. Robert Steelman, DMD Carolyn Wilson, DDS, MSD Steven Nelson, DDS Department of Pediatric Dentistry and Oral and Maxillofacial Surgery Baylor College of Dentistry 3302 Gaston Ave. Dallas, TX 75246
1.
