報告日期： 104/ 2/10 內文：
I. Introduction
1. Supernumerary teeth refer to teeth in excess of the normal full complement of teeth in primary or permanent dentition.
2. The prevalence of supernumerary teeth ranges from 0.1% to 3.6%, and they are twice as common in permanent compared to in primary dentition.
3. Supernumerary teeth may occur singly, multiply, unilaterally, or bilaterally in the maxilla, mandible, or both.
4. The anterior maxillary region appears to be the site of predilection
5. Multiple supernumerary teeth are generally associated with cleidocranial dysplasia, Gardner’s syndrome, or cleft lip and palate.
6. Nonsyndromic multiple supernumerary teeth (NSMST) is a rare disorder that describes the presence of five or more supernumerary teeth not associated with another disease such as those mentioned above.
7. This case report presents the treatment and 3-year follow up of NSMST in a 10-year-old girl with 11 supernumerary teeth, 2 of which showed subsequent formation.
II. Case report
1. General data：A 10-year-old Caucasian girl
2. Chief complaint：Delayed eruption of the permanent maxillary anterior teeth.
3. Past medical history & family history: No significant medical history and no family history of dental anomalies. The patient was a healthy child with no mental retardation, normal facial appearance, and no skeletal or other abnormalities suggestive of a systemic syndrome.
口腔病理科 On-Line KMU Student Bulletin
4. Clinical examination：
Overretained primary maxillary anterior teeth.
Class I molar relationship.
Oral hygiene: fair.
5. panoramic radiograph: 9 retained supernumerary teeth:
2 mesiodens,
4 in the mandibular left and right premolar regions,
2 in the maxillary right premolar region,
1 in the maxillary right canine region..
6. Treatment: Extraction of the retained supernumerary teeth and associated primary teeth in order to allow the permanent teeth to erupt. 20 teeth were extracted under general anesthesia (11 primary teeth and 9 impacted supernumerary teeth)
7. Postoperative follow-up:
The patient was also provided with removable space maintainers
Routine clinical and radiographic follow-up was performed at 6, 12, and 24 months in order to detect any possible delayed appearance of new supernumerary teeth.
After 2 years of follow-up, 2 additional supernumerary teeth were observed, 1 in the maxillary left premolar region and 1 in the maxillary anterior region.
口腔病理科 On-Line KMU Student Bulletin
Extraction of the new supernumerary teeth was performed ,
Orthodontic treatment was initiated.
3-years follow up
Panoramic radiograph of the younger brother of the patients’ at age 5 showed an impacted supernumerary tooth in the mandibular left canine region
Extraction the supernumerary tooth was delayed until the eruption time of premolars
III. Discussion: Nonsyndromic Multiple Supernumerary Teeth 1. Although the exact etiology of supernumerary teeth is unknown.
Phylogeny - the most acceptable;
Autonomic recessive inheritance linked to the X chromosome;
An abnormal reaction to a local traumatic episode;
Environmental factors;
Dichotomy of the tooth germ
examination showing the presence of five or more supernumerary teeth, regardless of their location.
3. No systemic disorder.
4. Prevalence: Yague-Garc ¨ ´ıa et al. reported
76.7% of supernumerary teeth in NSMST to be located in the upper jaw,
Mesiodens the most frequent supernumerary tooth, representing 35.29%
5. Radiological examinations: Periodic radiological examinations to rule out the formation of new supernumerary teeth is advisable in suspected cases of NSMST.
6. Complications:
Crowding
Delayed eruption or impaction
Diastema development
Cystic lesions
Occlusal problems
Resorption of adjacent teeth.
Therefore, early diagnosis, proper evaluation, and appropriate treatment are essential.
7. Treatment: There is no single ideal treatment option for supernumeraries;
Orthodontic treatment.
The risk of damage to adjacent structures
The benefits
In this case, the supernumerary teeth were extracted because they would impede the eruption of permanent premolars and incisors.
8. Conclusion: Regular follow-up for late forming supernumeraries is crucial for NSMST cases. Radiographic monitoring of the siblings is also important in such cases.
題號 題目
1 Which disease does not associate with multiple supernumerary teeth?
(A) Cleidocranial dysplasia (B) Gardner’s syndrome
(C) Gorlin syndrome
(D) Cleft lip and palate
答案( C) 出處：Oral and Maxillofacial Pathology - 3rd Edition
題號 題目
2 最常見發現多生牙(supernumerary teeth)的區域為下列何者?
(A) 上顎前牙
(B) 上顎小臼齒.
(C) 下顎前牙
(D) 下顎小臼齒
答案( A) 出處：Oral and Maxillofacial Pathology - 3rd Edition
