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Literature Update Sep - Oct 2011

Clinical Oral Implants Research

Vol. 22 No. 10 (October 2011)

Collaert B, Wijnen L, De Bruyn H. A 2-year prospective study on immediate loading with fluoride-modified

implants in the edentulous mandible. Clin Oral Implants Res 2011;22(10):1111-1116.

Each of 25 patients received five fluoride-modified implants that were immediately functionally loaded with provisional restorations. Marginal bone loss was evaluated at placement and after 3, 6, 12 and 24 months. Implant survival was 100%, and mean bone loss values were 0.14 mm, 0.13 mm, 0.11 mm and 0.11 mm after 3, 6, 12 and 24 months, respectively. Mean bone loss after 24 months at the patient level was 0.12 ±

0.14 mm, while the mean probing depth and bleeding index were 2.45 ± 0.43 mm and 0.55 ± 0.34%, respectively. Immediate loading of fluoride-modified implants may therefore be a predictable treatment option.

 

Mangano C, Mangano F, Shibli JA, Ricci M, Sammons RL, Figliuzzi M. Morse taper connection implants

 s uppor ting  planned’  m ax illary  and  m andibular  bar -retained overdentures: a 5-year prospective  multicenter

study. Clin Oral Implants Res 2011;22(10):1117-1124.

A total of 60 patients received 288 implants with a Morse taper connection (152 in maxillae and 136 in mandibles), and bar-retained overdentures were planned to be supported by four implants. Implant survival after 5 years was 98% (97.4% and 98.6% in the maxilla and mandible, respectively); 98.6% of the surviving implants were classified as successful. The mean distance from the implant shoulder to the first crestal bone was 0.7 ± 0.53 mm, and there were few prosthetic complications.

 

Cordaro L, Torsello F, Morcavallo S, di Torresanto VM.  Effect of bovine bone and collagen membranes on healing of mandibular bone blocks: a prospective randomized controlled study. Clin Oral Implants Res

2011;22(10):1145-1150.

A total of 22 ridges with horizontal alveolar deficiency were treated with multiple mandibular blocks for horizontal augmentation only (control) or with additional deproteinized bovine bone at the periphery and over the graft (test); collagen membranes were then placed. A total of 55 implants were placed after 4 months: crest width was measured before and after augmentation, and before implant placement. No significant differences in width were noted between groups at baseline and after grafting, with mean augmentation values of 4.18 mm and 4.57 mm in the test and control groups, respectively. Augmentation values at implant placement were 3.93 mm and 3.67 mm in the test and control groups, respectively. Mean graft resorption was significantly greater in the control group, but slightly more complications were noted in the test group. All implants were successful after 24 months. Graft resorption was therefore minimised by the additional use of bovine bone mineral.

 

Vasak C, Watzak G, Gahleitner A, Strbac G, Schemper M, Zechner W.  Computed tomography-based evaluation of template (NobelGuide)-guided implant positions: a prospective radiological study. Clin Oral Implants Res 2011;22(10):1157-1163.

Eighteen patients with partially or fully edentulous maxillae and mandibles received a total of 86 implants via

the NobelGuide protocol. Pre- and post-operative CT scans were taken and merged into Procera planning software. Mean deviations at the implant shoulder were 0.43 mm (bucco-lingual), 0.46 mm (mesio-distal) and

0.53 mm (depth) and at the apex were 0.7 mm (bucco-lingual), 0.63 mm (mesio-distal) and 0.52 mm (depth). The maximum deviation (2.02 mm) was seen in the corono-apical direction. Deviations were significantly lower in the anterior versus posterior regions and in the mandible versus the maxilla, and there was a significant correlation between deviation and mucosal thickness. All maximum deviations were within the recommended safety margins.

 

van Brakel R, Noordmans HJ, Frenken J, de Roode R, de Wit GC, Cune MS. The effect of zirconia and titanium  implant  abutments  on  light  reflection  of  the  supporting  tissues.  Clin  Oral  Implants  Res

2011;22(10):1172-1178.

In 11 patients, Ti or ZrO2 abutments were placed on 15 implants and hyper-spectral images were taken. High resolution images at 70 nm intervals were obtained within 30 s, and black-and-white references were used for special and spectral normalisation and correction for motion. Reflection spectra were then obtained from the images from 1 mm above the soft tissue to 3 mm apically. The median soft tissue height was 2.3 mm, and a rapid increase in buccal mucosa thickness was observed in an apical direction. At a mucosa thickness of 2.0

± 0.1 mm, no difference in mucosal light reflection could be detected between Ti and ZrO2 abutments. The difference in light reflection is therefore no longer noticeable to the human eye for a mucosal thickness of at least 2 mm.

 

Enkling N, Jöhren P, Klimberg V, Bayer S, Mericske-Stern R, Jepsen S.  Effect of platform switching on peri- implant bone levels: a randomized clinical trial. Clin Oral Implants Res 2011;22(10):1185-1192.

Each of 25 subjects received two implants (diameter 4 mm) in one side of the posterior mandible. After 3 months, the test implant received an abutment of 3.3 mm diameter, while the control implant received an abutment of 4 mm diameter, and provisional single-tooth crowns were placed. Subjects were monitored over

1 year, and radiography and microbiological samples were taken at baseline and 3, 4 and 12 months. Mean vertical bone loss after 12 months was 0.53 ± 0.35 mm and 0.58 ± 0.55 mm for the test and control implants, respectively, and the mean intra-individual difference was 0.05 ±0.56 mm. Changes in crestal bone level were significantly dependent on time but not on platform switching. The internal spaces of the implants in both

groups were contaminated with bacteria, with no significant difference between test and control. The results did not confirm the hypothesis of reduced bone loss with platform switching.

 

 

Implant Dentistry

Vol. 20 No. 4 (August 2011)

Calderón JH,  Valencia RM,  Casasa AA,  Sánchez MA,  Espinosa R,  Ceja  I.  Biomechanical anchorage

evaluation  of  mini-implants  treated  with  sandblasting  and  acid  etching  in  orthodontics.  Implant  Dent

2011;20(4):273-279.

Thirteen patients received a total of 24 orthodontic sandblasted and acid-etched implants for skeletal anchorage, and anchorage measurements were obtained radiographically every month for 6 months. All implants were effective for the trial, but 65% showed of displacement, while 35% showed of displacement. Less displacement was observed for mandibular compared to maxillary implants, and less displacement was observed in the anterior versus the posterior maxilla. Good bone anchorage was therefore observed with sandblasted and acid-etched orthodontic implants.

 

Bae M-S, Sohn D-S, Ahn M-R, Lee H-W, Jung H-S, Shin I-H.  Retrospective multicenter evaluation of tapered implant with a sandblasted and acid-etched surface at 1 to 4 years of function. Implant Dent 2011;20(4):280-

284.

Patient records of 92 patients who received a total of 294 implants at three centres over a 3-year period were retrospectively evaluated. The mean observation period was 38 months (range 22 to 59 months) and the cumulative survival rate was 97.3%. The mean bone loss after 1 year of functional loading was 0.33 mm. Clinically reliable results were therefore obtained.

 

Sánchez-Pérez A,  Moya-Villaescusa MJ,  Caffesse RG.  Temperature of  periimplant tissues  in  clinically successful implants: an observational clinical study in humans. Implant Dent 2011;20(4):292-298.

One clinically and radiologically successful implant in each of 51 patients was examined. Peri-implant temperatures were measured and compared to sublingual temperatures. Significant differences in opera-

implant temperature were found between the fourth and fifth sextants, but the differences were not significant in comparison to sublingual temperature. The mean difference between peri-implant and sublingual temperature was 0.81.

 

 

International Journal of Oral and Maxillofacial Implants

Vol. 26 No. 4 (July/August 2011)

Marković A, Čolić S, Dražić R, Gačić B, Todorović A, Staić Z.  Resonance frequency analysis as a reliable criterion for early loading of sandblasted/acid-etched active surface implants placed by the osteotome sinus

floor elevation technique. Int J Oral Maxillofac Implants 2011;26(4):718-724.

SLActive implants were placed in the posterior maxilla of 27 patients using the osteotome sinus floor elevation technique. RFA was measured at