Reduced Arch Length as a Factor for 4-Implant Immediate Function in the Maxilla: A Technical Note and Report of 39 Patients Followed for 5 Years.
OBJECTIVE
To determine whether maxillary arch length deficiency treated with a V-4 implant placement method is adequate for immediate functional loading during a 5-year follow-up.


METHODS
Thirty-nine patients were treated with maxillary immediate function from January 3, 2011 to February 28, 2011 and followed for a period of 5 years. Arch length after implant placement was measured retrospectively around the arch from the anterior sinus wall to the contralateral anterior sinus wall in a mid-alveolar arc on the occlusal view of the preoperative computed tomogram. Eight patients with an osseous arch length shorter than 45 mm were treated with a V-4 pattern. Thirty-one patients with an arch length longer than 45 mm were treated with an M-4 placement pattern. The aim was to determine whether immediate function with a shorter arch length could be obtained on the day of surgery using a V-4 placement and whether implant stability would persist during the 5-year follow-up. Any surgical events, including lost implants, were recorded in the charts. Late follow-up was performed by panoramic films.


RESULTS
During the 2-month treatment period, 39 patients (8 with V-4 placement and and 31 with M-4 placement) received maxillary treatment. The 8 patients in the V-4 group had an arch length average of 36.0 mm available for osseointegration. The 31 patients in the M-4 group had an arch length average of 56.6 mm. There were 7 implant losses (and replacements) during the 5-year follow-up, 1 in the V-4 group and 6 in the M-4 group.


CONCLUSIONS
When the arch length bone available for osseointegration is shorter than 45 mm, a V-4 placement strategy might enable successful 4-implant fixed denture support for immediate function.
Adjunct Professor, University of Utah School of Dentistry, Salt Lake City, UT. Electronic address: Ojensen@clearchoice.com.
Ole T
OT
Jensen
Private Practice, Winston Salem, NC.
Jason L
JL
Ringeman
Private Practice, Denver Clear Choice Center, Greenwood Village, CO.
Mark W
MW
Adams
Straumann Fellow, Denver Clear Choice Center, Greenwood Village, CO.
Nicholas
N
Gregory
D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D057893:Immediate Dental Implant Loading / Q000379:methods*; D008437:Maxilla / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008439:Maxillary Diseases / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D012189:Retrospective Studies; D016896:Treatment Outcome