Year : 2010 | Volume
: 13 | Issue : 2 | Page : 106--109
Successful apexification with resolution of the periapical lesion using mineral trioxide aggregate and demineralized freeze-dried bone allograft
Naveen Chhabra1, Kiran P Singbal2, Sharad Kamat3,
1 Department of Conservative Dentistry and Endodontics, Institute of Dental Sciences, Bareilly, India
2 Department of Conservative Dentistry and endodontics, Vyas Dental College, Jodhpur, India
3 Department of Conservative Dentistry and endodontics, PMNM Dental college and hospital, Bagalkot, India
Department of Conservative Dentistry and Endodontics, Institute of Dental Sciences, Bareilly, Uttar Pradesh-243 006
Immature teeth with necrotic pulp and large periapical lesion are difficult to treat via conventional endodontic therapy. The role of materials such as calcium hydroxide and mineral trioxide aggregate in apexification is indispensable. This case report presents the successful healing and apexification with combined use of white mineral trioxide aggregate and demineralized freeze-dried bone allograft.
|How to cite this article:|
Chhabra N, Singbal KP, Kamat S. Successful apexification with resolution of the periapical lesion using mineral trioxide aggregate and demineralized freeze-dried bone allograft.J Conserv Dent 2010;13:106-109
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Chhabra N, Singbal KP, Kamat S. Successful apexification with resolution of the periapical lesion using mineral trioxide aggregate and demineralized freeze-dried bone allograft. J Conserv Dent [serial online] 2010 [cited 2019 Sep 19 ];13:106-109
Available from: http://www.jcd.org.in/text.asp?2010/13/2/106/66723
Complete asepsis and three-dimensional obturation of the root canal system are essential for long-term endodontic success. In certain cases such as immature teeth, the absence of natural apical constriction creates a challenge. Therefore, one of the aims of endodontic treatment is to produce an apical barrier or stop, against which one can place a root canal filling material avoiding overextrusion. This technique is termed apexification.
Clinicians have tried several materials to form apical barrier in the past. These include: calcium hydroxide paste, calcium hydroxide powder; mixed with different vehicles, ,, tricalcium phosphate,  collagen calcium phosphate,  osteogenic protein-1, bone growth factor and oxidized cellulose.  proplast, (a polytetrafluor-ethylene and carbon felt-like porous material),  barium hydroxide,  true bovine bone ceramics,  and dentin chips. Antibacterial such as paste of metronidazole, ciprofloxacin, and cefaclor has effectively encouraged apexification.  Deliberate over instrumentation of the periapical area to produce a blood clot that will induce apical closure has also been described. 
Mineral trioxide aggregate (MTA) was developed at Loma Linda University for use as a root-end filling material.  MTA has shown potential outcome in carrying out apexification of immature permanent teeth. , Apexification using MTA has several advantages such as it neither gets resorbed, nor weakens the root canal dentin, and also sets in the wet environment. Satisfactory compaction of obturating material is achievable as MTA on setting provides a sound and hard apical barrier.
Bio-resorbable demineralized bone matrix (DMBM) is the protein component of bone and is widely used in various clinical conditions such as periodontal defects and oral and maxillofacial bone defects. Periodontal defects grafted with demineralized bone matrix allograft showed histologic evidence of regeneration of new bone and periodontium.  Considering the osteoconductive potential and proven success of demineralized bone matrix allograft in the management of periodontal defects, it provides an excellent alternative for use in management of large periapical radiolucency.
The apical matrix of some resorbable and biocompatible material is essential to control extrusion of MTA. "Modified matrix concept" for repair of perforation utilized resorbable collagen as a matrix followed by condensation of MTA.  Considering the biocompatible nature of bio-resorbable demineralized bone matrix, it could be the material of choice in such cases.
Therefore, present case report highlights the nonsurgical management of symptomatic tooth with blunderbuss canal and large periapical radiolucency using bio-resorbable demineralized bone matrix and MTA.
A 16-year-old male patient of south Indian origin reported to the department of conservative dentistry and endodontics, PMNM Dental College and Hospital, Bagalkot, Karnataka, India, with the complain of pain in right mandibular posterior teeth since 3 weeks. Careful intraoral examination revealed sinus opening in relation to the right lower second premolar. Hard tissue examination revealed the presence of "dens evaginatus" and a deep pit in right mandibular second premolar [Figure 1]a. Concerned tooth did not respond to electric pulp testing. Radiographic examination revealed deep pit communicating with the pulp space, presence of blunderbuss canal, and large periapical radiolucency with respect to right mandibular second premolar [Figure 1]b. There were two treatment options- either surgical removal of the periapical lesion followed by retrograde filling or nonsurgical endodontic treatment consisting of routine endodontic therapy and apexification using mineral trioxide aggregate. Nonsurgical treatment was opted considering the age and amount of trauma expected during surgical treatment. Local anesthesia was not required as tooth was nonvital. Access was prepared under rubber dam isolation. Pus exuded through the canal immediately after access preparation. Canal was irrigated using lukewarm normal saline to assist in exudation. Access preparation was left open until exudate stopped coming out. This followed thorough biomechanical preparation, involving circumferential filling with a size 80 K file (Dentsply, India) to remove any debris or necrotic dentin and root canal irrigation with 1.25% sodium hypochlorite solution. Thereafter, calcium hydroxide and iodoform combination (Metapex TM , META Biomed Co. Ltd., Korea) was placed in canal and patient was recalled after 15 days [Figure 1]c. Recall appointment showed the healing sinus and patient was asymptomatic. The medicament was removed from the canal followed by irrigation with 1.25% sodium hypochlorite. After confirming dryness of canal, the apical matrix/barrier was created via pushing decalcified freeze-dried bone allograft (Osseograft TM , Advanced Biotech Products (P) LTD, India) through the canal using finger pluggers (Dentsply, India) and packing it in periapical area [Figure 1]d. This was followed by a placement of 5 mm apical plug of white mineral trioxide aggregate (PROROOT MTA TM Dentsply, India) using a finger plugger. Keeping moist cotton over the canal orifice achieved complete setting of MTA, which was followed by closure of access preparation using an interim restorative material (Cavit G TM 3M ESPE, India) [Figure 1]e. The patient was asymptomatic at 1-week recall visit. Therefore, remaining canal was obturated using resin-based endodontic sealer (AH 26, Dentsply India) and thermoplasticized gutta percha (Obtura II, J. Morita Corporation, Japan). The 6-month follow-up radiograph of the patient showed reduction in the size of the periapical lesion [Figure 1]f. At 2-year recall, the patient was completely asymptomatic and intraoral periapical radiograph of the same tooth revealed complete resolution of the periapical lesion [Figure 1]g.
Despite the higher success rate of apical barrier formation using calcium hydroxide, long-term follow-up is essential. Problems such as failure to control infection, recurrence of infection, and cervical root fracture may occur. , Apexification using mineral trioxide aggregate provides an alternative treatment modality in immature pulpless teeth. Apexification with MTA requires significantly less time.  Mineral trioxide aggregate as an apexification material represents a contemporary version of the primary monoblock. Apatite-like interfacial deposits form during maturation of MTA result in filling up of gaps induced during the material shrinkage phase and improve the frictional resistance of MTA to the root canal walls. The formation of nonbonding, gap-filling apatite deposits probably also accounts for the seal of MTA in orthograde obturations and perforation repair. 
MTA has superior biocompatibility and sealing ability and is less cytotoxic than other materials currently used in pulpal therapy.  The 5-mm barrier is significantly stronger and shows less microleakage as compared to the 2-mm barrier of MTA. 
Apexification using MTA lessens the treatment time between the patient's first appointment and the final restoration. The importance of this approach lies in the expedient cleaning and shaping of the root canal, followed by apical seal with a material that favors regeneration. In addition, there is reduced potential for fracture of immature teeth with thin roots, because of immediate placement of bonded core within the root canal. 
In the present case, combination of calcium hydroxide and iodoform was used as intracanal medicament for 15 days to make the canal dry and free from infection. Use of calcium hydroxide for such a short term does not adversely affect the fracture resistance of the tooth. 
The demineralized bone matrix acts as an osteoconductive and possibly as an osteoinductive material. , Hence, probably, allograft material could have promoted the healing in the present case. However, only objective of using bone graft material in this case was to produce an apical barrier. Use of the apical matrix of decalcified freeze-dried bone allograft material in the present case provided excellent compaction of mineral trioxide aggregate, while minimizing extrusion of mineral trioxide aggregate in the periapical area.
Decalcified freeze-dried bone allograft material has been extensively used in the management of extensive periodontal defects. Its use results in significant probing depth reduction, clinical attachment gain, and bone fill. Definite evidence exists that sites grafted with DFDBA heal with regeneration of periodontium. , Follow-up radiographs also showed the excellent healing with resolution of periapical pathology. Recent literature reported the successful use of combination of hydroxyapatite and platelet rich plasma in surgical management of the large periapical lesion with open apex.  Combination of hydroxyapatite and platelet-rich plasma or demineralized bone matrix and platelet-rich plasma can also be tried using the method as stated in the present case in further case studies.
'Dens evaginatus' or 'evaginated odontoma' is a developmental anomaly that occurs more often in mandibular premolars;  however, it can also affect other teeth, including supernumerary teeth.  It is the result of an abnormal proliferation of the inner enamel epithelium into the stellate reticulum of the enamel organ.  The resulting tubercle contains a core of dentin surrounding a pulpal extension, which may be narrow, wide, constricted, an isolated horn, or not present at all.  The prevalence of Dens evaginatus is between 1% and 4%. It occurs most commonly in people in the Mongoloid racial group, which includes the Paleo-Asiatics (Indians of North, Central and South America and Eskimos), the Neo-Asiatics (Chinese, Thais and Japanese), and the Indonesian-Malays (Filipinos).  In this case, probably invasion of salivary fluids and microorganisms through the enamel of the occlusal table caused the damage. Early detection of dens evaginatus is important-it may be possible to fissure seal over the defect using bonded restorative, or cut the defect away and perform an MTA pulpotomy.
This case report presents a novel approach to achieve single visit apexification of the cases with open apex and large periapical lesion. Present case also stresses the early detection and treatment of 'dens evaginatus' which if undetected can cause undue damage.
|1||Michanowicz JP, Michanowicz AE. A conservative approach and procedure to fill an incompletely formed root using calcium hydroxide as an adjunct. J Dent Child 1967;34:42-7.|
|2||Pitts DL, Jones JE, Oswald RJ. A histological comparison of calcium hydroxide plugs and dentin plugs used for the control of Guttapercha root canal filling material. J Endod 1984;10:283-93.|
|3||Schumacher JW, Rutledge RE. An alternative to apexification. J Endod 1993;19:529-31.|
|4||Coviello J, Brilliant JD. A preliminary clinical study on the use of tricalciumphosphate as an apical barrier. J Endod 1979;5:6-13.|
|5||Nevins A, Finkelstein F, Laporta R, BordenBG. Induction of hard tissue into pulpless open-apex teeth using collagen-calcium phosphate gel. J Endod 1978;4:76-81.|
|6||Dimashkieh MR. A method of using silver amalgam in routine endodontics, and its use in open apices. Br Dent J 1975;138:298-300.|
|7||Eleazer PD, McDonald TW, Sinai IH, Fantasia JE, Michelich RJ, Yagiela JA. Proplast as an apical barrier in root canal therapy. J Endod 1984;10:487-90.|
|8||Narang R, Wells H. Experimental osteogenesis in periapical areas with decalcified bone matrix. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1973;35:136-43.|
|9||Yoshida T, Itoh T, Saitoh T, Sekine I. Histopathological study of the use of freeze-dried allogenic dentin powder and True Bone Ceramic as apical barrier materials. J Endod 1998;24:581-6.|
|10||Thibodeau B, Trope M. Pulp revascularization of a necrotic infected immature permanent tooth: Case report and review of the literature. Pediatr Dent 2007;29:47-50. |
|11||Ham JW, Patterson SS, Michell DF. Induced apical closure of immature pulpless teeth in monkeys. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1972;33:438-49.|
|12||Torabinejad M, Hong CU, McDonald F, Pitt Ford TR. Physical and chemical properties of a new root-end filling material. J Endod 1995;21:349-53.|
|13||Arcangelo DC, Amario DM. Use of MTA for orthograde obturation of nonvital teeth with open apices: Report of two cases. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2007;104:e98-101.|
|14||Gutmann JL. The use and predictable placement of Mineral Trioxide Aggregate in one-visit apexification cases. Aust Endod J 2003;29:34-42.|
|15||Mellonig JT. Bone Allografts in periodontal therapy. Clin Orthop Relat Res 1996;324:116-25.|
|16||Bargholz C. Perforation repair with mineral trioxide aggregate: A modified matrix concept. Int Endod J 2005;38:59-69.|
|17||Rafter M. Apexification: A review. Dent Traumatol 2005;21:1-8.|
|18||Sheehy EC, Roberts GJ. Use of calcium hydroxide for apical barrier formation and healing in non-vital immature permanent teeth: A review. Br Dent J 1997;183:241-6. |
|19||Pradhan DP, Chawla HS, Gauba K, Goyal A. Comparative evaluation of endodontic management of teeth with unformed apices with mineral trioxide aggregate and calcium hydroxide. J Dent Child 2006;73:79-85.|
|20||Tay FR, Pashley DH. Monoblocks in root canals: A hypothetical or a tangible goal. J Endod 2007;33:391-8.|
|21||Schmitt D, Lee J, Bogen G. Multifaceted use of ProRoot MTA root canal repair material. Pediatr Dent 2001;23:326-30.|
|22||Matt GD, Thorpe JR, Strother JM, McClanahan SB. Comparative study of white and gray material trioxide aggregate (MTA) simulating a one- or two-step apical barrier technique. J Endod 2004;30:876-9.|
|23||Steinig TH, Regan JD, Gutmann JL. The use and predictable placement of Mineral Trioxide Aggregate in one-visit apexification cases. Aust Endod J 2003;29:34-42.|
|24||Hasheminia SM, Norozynasab S, Fezianfard M. The effect of three different calcium hydroxide combinations on root dentin microhardness. Res J Biol Sci 2009;4:121-5.|
|25||Finkemeier CG. Bone-grafting and bone-graft substitutes. J Bone Joint Surg Am 2002;84:454-64.|
|26||Meadows CL, Gher ME, Quintero G, Laferty TA. A comparison of polylactic acid granules and decalcified freeze dried bone allograft in human periodontal osseous defects. J Periodontol 1993;64:103-9. |
|27||Mellonig JT. Freeze dried bone allografts in periodontal reconstructive surgery. Dent Clin North Am Reconstr Periodont 1991;35:505-20.|
|28||Hiremath H, Gada N, Kini Y, Kulkarni S, Akub SS, Metgud S. Single step apical barrier placement in immature teeth using mineral trioxide aggregate and management of periapical inflammatory lesion using platelet rich plasma and hydroxyapatite. J Endod 2008:34:1020-4.|
|29||Oehlers FA, Leek KW, Lee EC. Dens evaginatus (evaginated odontome): Its structure and responses to external stimuli. Dent Pract Dent Rec 1967;17:239-44.|
|30||Al-Omari MA, Hattab FN, Darwazeh AM, Dummer PM. Clinical problems associated with unusual cases of talon cusp. Int Endod J 1999;32:183-90.|
|31||Echeverri EA, Wang MM, Chavaria C, Taylor DL. Multiple dens evaginatus: Diagnosis, management, and complications: Case report. Pediatr Dent 1994;16:314-7.|
|32||Hill FJ, Bellis WJ. Dens evaginatus and its management. Br Dent J 1984;156:400-2.|