Clinical, Radiographic, & Histological Study of Endodontically Treated Retained Roots To Preserve Alveolar Bone

By Reames RL, Nickle JS, Patterson SS, Boone M, El-Kafrawy AH

Date: 03/1976
Journal: JOE


Purpose: to determine whether new bone will form coronal to retained endodontically treated roots

N= 2 Macaca Speciosa monkeys


•Conventional RCT was done for central incisor, lateral incisor, second premolar & first molar.

•Contralateral teeth were extracted to serve as a control group.

•The crown has been removed  to the level of the alveolar bone, then the roots  amputated  2-3 mm below the crest of the alveolar bone,  and sharp edges Rounded

•Approximation of the labial flaps to the lingual tissue, suturing with no. 3-0 silk sutures.

•Clinical & radiographic examination  were conducted  at 6, 12 & 20 weeks intervals.

•Procion Dye was administered to label newly bone formed a week before they were killed.

Most highlighted Results:


– normal and uncomplicated healing of the soft tissue with normal attached, unattached alveolar muccosa & and adequate vestibule

– The extreme distobuccal aspect of the posterior segment was the only site of inflammation after 5 months in both monkeys.


–  The normal resorpative process continued & at 5 months it had slowed to an indiscernible amount

 – Bone formation was apparent in 1 / 4 anteriors & 4 / 8 posterior retained root tips