H. Tal et al., Spontaneous early exposure of submerged endosseous implants resulting in crestal bone loss: A clinical evaluation between stage I and stage II surgery, INT J O M I, 16(4), 2001, pp. 514-521
Citations number
23
Categorie Soggetti
Dentistry/Oral Surgery & Medicine
Journal title
INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL IMPLANTS
Spontaneous early exposure of submerged implants during the osseointegratio
n healing phase may be a harmful factor that results in early crestal bone
loss around the implants. The objective of this study was to assess the eff
ect of spontaneous early exposure on crestal bone loss around submerged imp
lants, with special attention given to the relationship between the degree
of exposure and the amount of peri-implant bone loss. Crestal bone level re
lative to the shoulder of the implant was measured at the time of placement
and at the time of exposure 4 to 5 months later During the period between
stage I and stage II surgery, implant sites were observed, and each implant
site in which spontaneous early exposure was detected was recorded. Perfor
ations were classified according to the degree of implant exposure from Cla
ss 0 (no perforation) to Class IV (complete exposure), Measurements from 20
6 implants in 64 patients produced 85 groups valid for statistical comparis
on; each of these contained at least 2 lesions of different types. There wa
s a statistically significant difference between bone loss associated with
intact mucosa (Class 0) and Class I, Class II, and Class III lesions, and b
etween Class I and II lesions. There were no significant differences betwee
n Class I and III and between Class II and III. In Class II and III lesions
, there was more bone loss associated with the buccal aspect of the implant
s. Of the 115 perforated sites, 10 were associated with bone loss exceeding
2 mm, 2 presented 3 to 4 mm bone loss, 1 showed more than 4 mm, and 1 disp
layed more than 5 mm. In view of the clinical implications that spontaneous
early exposure may have on the success of osseointegration, prematurely pa
rtially exposed implants should be exposed as soon as possible after the pe
rforation is observed.