|Year : 2014 | Volume
| Issue : 2 | Page : 155-157
Oeler's type III dens invaginatus: A case report with 1-year follow-up
Liza George1, Ajit G Mohan1, Justin Mathew2
1 Department of Conservative Dentistry and Endodontics, Annoor Dental College, Muvattupuzha, Kerala, India
2 Department of Oral and Maxillofacial Surgery, Annoor Dental College, Muvattupuzha, Kerala, India
|Date of Web Publication||20-Jun-2014|
Dr. Liza George
Department of Conservative Dentistry and Endodontics, Annoor Dental College, Muvattupuzha, Kerala
Source of Support: None, Conflict of Interest: None
Dens invaginatus is a rare anomaly that occurs due to deepening of enamel organ into the root, either fully or partially during tooth development. The purpose of this paper is to present a case of Oehler's type III dens invaginatus on a maxillary left lateral incisor with a large periapical lesion. Combined endodontic therapy and surgery showed good healing when the patient was evaluated clinically and radiographically after 1-year. This case report highlights the importance of proper debridement of the main canal of a case of dens invaginatus because of its complex anatomy.
Keywords: Dens invaginatus, maxillary lateral incisor, invagination, periapical lesion
|How to cite this article:|
George L, Mohan AG, Mathew J. Oeler's type III dens invaginatus: A case report with 1-year follow-up. Eur J Gen Dent 2014;3:155-7
|How to cite this URL:|
George L, Mohan AG, Mathew J. Oeler's type III dens invaginatus: A case report with 1-year follow-up. Eur J Gen Dent [serial online] 2014 [cited 2019 Jul 16];3:155-7. Available from: http://www.ejgd.org/text.asp?2014/3/2/155/134846
| Introduction|| |
Dens invaginatus or dens in dente occurs as a result of deepening or invagination of the dental papilla prior to calcification of the dental tissues.  The maxillary lateral incisor is the most commonly affected teeth with a prevalence of 0.25-5.1%.  According to Oehlers, dens invaginatus can be classified into three categories depending on the depth of enamel invagination inside the tooth.  Type I is reported to be the most common (79%) followed by type II (15%) and type III (5%).  This case report presents a case of type III dens invaginatus involving maxillary lateral incisor where conventional endodontic treatment was initially attempted followed by periapical surgery.
| Case Report|| |
A 35-year-old male patient came to the dental office for routine check-up. On examination, tooth number 22 showed discoloration and a swelling was seen on the left side of the palate in the apical area of tooth numbers 21, 22, and 23. The swelling was firm and there was no associated sinus opening. The pulp sensibility test was done with electric pulp tester and tooth number 22 gave a negative response [Figure 1]. Intraoral periapical radiograph showed type III dens invaginatus involving the tooth number 22 and a large radiolucency extending from tooth number 21 on the mesial side to tooth number 23 on the distal side [Figure 2].
|Figure 2: Radiograph showing dens invaginatus in tooth 22 with periapical lesion|
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Considering the extent of the lesion, root canal treatment was started in all the three teeth under rubber dam isolation after administering local anesthesia using 2% lidocaine plus 1:1,000,000 epinephrine. Access opening was first initiated on tooth number 22 and a wide mesiodistal oval shaped cavity was made using no-2 round bur. With the aid of the LN bur (Dentsply Maillefer, Tulsa, OK, USA) and DG-16 endodontic explorer (Hu-Friedy, Chicago, IL, USA) two orifices were detected and their patency was ascertained using No-10 K file (Dentsply, Maillefer). No communication was observed between the main canal and invagination. The orifices were enlarged at the coronal and middle third using Gates-Glidden drills numbers 1 and 2 [Figure 3]. The canals were irrigated with 5.25% sodium hypochlorite, 17% ethylene diamine tetra acetic acid and finally rinsed with 0.9% saline. The working length of main canal and invagination was determined using apex locator (Root ZX, J Morita, Japan) and confirmed with radiograph. Both were enlarged using step back technique up to No-40 K file (Dentsply, Maillefer). The canals were dried with sterile paper points (Dentsply, Maillefer) and calcium hydroxide (Calcicur; VOCO, Cuxhaven, Germany) was placed as the intracanal medicament. The access cavity was sealed temporarily with Cavit (3M ESPE AG, Seefeld, Germany). Simultaneously access opening was done on tooth numbers 21 and 23, working length established, cleaned and shaped, the intracanal medicament placed and the access cavity was sealed.
The patient was recalled after 1-month and on examination the swelling persisted on the palatal aspect and the tooth number 22 was tender on percussion. The patient was posted for periapical surgery. Prior to surgery the three teeth were obturated with Gutta-percha (Dentsply, Maillefer, Ballaigues, Switzerland) using lateral condensation technique with AH Plus sealer (Dentsply, Maillefer). The access cavity was sealed with Glass ionomer cement (Fuji IX; GC Corp., Tokyo, Japan) and later confirmed with radiograph [Figure 4].
A buccal full-thickness trapezoidal mucoperiosteal flap was elevated to expose the area of periapical lesion. Already existing pathological cortical bone window was expanded until underlying pathology was adequately exposed. Cystic enucleation was carried out under direct vision and the cyst was removed in-toto. Root resection was not done to maintain maximum cemental covering on the root surface and to maintain the original root length to help tooth stability. Gutta-percha at the exposed root surface was burnished. The bony cavity was irrigated with saline followed by closure of the site after hemostasis. Postoperative period was uneventful. The cystic sac was submitted for histopathological examination and the lesion was diagnosed as radicular cyst. Patient was reviewed at intervals of 3 months, 6 months, and 1-year and the radiograph showed good healing [Figure 5].
| Discussion|| |
Dens invaginatus is commonly overlooked because of absence of any significant clinical signs of anomaly. However, the tooth is more susceptible to caries, periapical pathology and periodontal inflammation due to enamel defects in the invaginated area.  Early intervention of the pit with acid etch restoration will prevent pulpal involvement. 
Types I and II dens invaginatus do not present treatment problems. It is only necessary to remove the invagination, create a tooth with a single canal, and do conventional endodontic treatment.  For cases of type III, invagination presents communication with the oral cavity.  Some authors have described nonsurgical treatments;  and there are also periodontal surgery case reports.  Extraction is indicated in case of teeth with poor prognosis.  This was a case of type III dens invaginatus, having two orifices, the main canal and the invagination, both exits separately at the apex. The apical exit of the invagination is the pseudo foramen and that of the main canal is the apical foramen.
Conservative treatment of any lesion is preferred over surgery as most periapical lesions are the inflammatory response to bacterial infection within the root canal. In nonsurgical management, root canal system is cleaned and disinfected; thereby periapical healing occurs. However in those cases in which causative factors are outside the root canal such as cyst, periapical surgery is indicated.
Calcium hydroxide intracanal medicament facilitates healing in nonvital teeth with periapical lesion. Herein, this case calcium hydroxide medication was attempted. Follow-up after 1 month revealed that the tooth was symptomatic and the swelling persisted. Hence, the treatment was changed to surgical intervention according to the clinical need. 
Invaginated teeth present technical difficulties due to its complex anatomy, the greatest of which was to locate the canals. The use of dental operating microscope, magnification loops and ultrasonic instruments is a valuable adjunct for visualizing the canals, thereby enhancing the success of the treatment.
At the 6 months and 1-year postoperative recall examination, the tooth was asymptomatic and radiographically showed signs of healing.
| Conclusion|| |
Type III dens invaginatus is a rare occurrence. Careful preoperative radiographic evaluation, a thorough knowledge of anatomical changes along and correct treatment procedure are necessary for success of the treatment.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]