Abstract : Purpose : A type Ⅰ endo-periodontal lesion is a disease in which an endodontic lesion first occurs and subsequently bacterial infection of the endodontic lesion extends to periodontal tissues through, for example, an apical foramen and an accessory canal. A tooth affected by a type Ⅰ endo-periodontal lesion has devitalized pulp and localized periodontal tissue inflammation. The basic treatment policy for type Ⅰ endo-periodontal lesions is endodontic treatment, that is, periodontal lesions as well as endodontic lesions are improved with treatment of the infected root canal. This case report describes two cases in which two different treatments were conducted for two teeth affected by chronic apical periodontitis with a localized deep periodontal pocket. The two cases were referred from two other dental clinics.
Case 1 : the affected tooth : 7┐ with a C-shaped root canal, the patient : a 38-year-old woman.
The probing pocket depth (PPD) of 7┐ was 3 mm in five areas except for the midbuccal area whose PPD was 7 mm at the first visit. A ledged root canal was observed at the middle site of a mesial root canal, and calcium hydroxide as an intracanal medication had been applied.
Case 2 : the affected tooth : 7┘, the patient : a 49-year-old woman.
The PPD on 7┘ was 3 mm in five areas except for the mesiobuccal area whose PPD was 8 mm at the first visit. A sinus tract was observed on the buccal marginal gingival area. Radiography showed that the three obturated root canals of 7┘ had a dense appearance. Dental calculus was found at the root apex of the mesiobuccal root which was close to a deep mesiobuccal-area periodontal pocket after 7┘ had been extracted.
Discussion : Although endodontic treatment is the first choice for treatment of type Ⅰ endo-periodontal lesions, intentional reimplantation in addition to combined endodontic and periodontal treatment should be conducted as needed in consideration of both the present condition of the affected tooth and the past course of treatment.
Conclusion : Infected root canal treatment and intentional replantation were conducted in case 1 and case 2, respectively, and both treatments gave successful clinical outcomes in both cases.
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