Publicaties
Hieronder vindt u enige publicaties waarvan 1 of meerdere van onze medewerkers hoofdauteur of co-auteur zijn:
1. Clin Implant Dent Relat Res. 2009 Nov 10. [Epub ahead of print]
A Prospective Study on the Accuracy of Mucosally Supported Stereolithographic
Surgical Guides in Fully Edentulous Maxillae.
D'haese J, Van De Velde T, Elaut L, De Bruyn H.
Department of Periodontology and Oral Implantology, Dental School, Faculty of
Medicine and Health Sciences, University of Ghent, Ghent, Belgium.
Background: Flapless implant placement using guided surgery is widespread, although clinical publications on the precision are lacking. Purpose: The purpose of this study was to evaluate the accuracy of mucosal-supported stereolithographic guides in the edentulous maxillae. Materials and Methods: Seventy-eight OsseoSpeed implants (Astra Tech AB, Mölndal, Sweden) of 3.5 to 5 mm width and 8 to 15 mm length were installed consecutively in 13 patients. Implants were functionally loaded on the day of surgery, and implant location was assessed with a computed tomography scan. Mimics 9.0 software (Materialise N.V., Leuven, Belgium) was used to fuse the images of the virtually planned and actually placed implants, and the locations, axes, and interimplant distances were compared. Results: One implant was lost shortly after insertion because of abscess formation caused by remnants of impression material. Seventy-seven implant locations were analyzed. The deviation at the entrance point ranged between 0.29 mm and 2.45 mm (SD: 0.44 mm), with a mean of 0.91 mm. Average angle deviation was 2.60 degrees (range 0.16-8.86 degrees ; SD: 1.61 degrees ). At the apical point, the deviation ranged between 0.32 mm and 3.01 mm, with a mean of 1.13 mm (SD: 0.52 mm). The mean deviation of the coronal and apical interimplant distance was respectively 0.18 mm (range 0.07-0.32 mm; SD: 0.15) and 0.33 mm (range 0.12-0.69 mm; SD: 0.28). These deviations are lower than the global coronal and apical deviations. Conclusion: The present study is the first to investigate the accuracy of stereolithographic, full, mucosally supported surgical guides in the treatment of fully edentulous maxillae. Clinicians should be warned that angular and linear deviations are to be expected. Short implants show significantly lower apical deviations compared with longer ones. Reasons for implant deviations are multifactorial; however, it is unlikely that the production process of the guide has a major impact on the total accuracy of a mucosal-supported stereolithographic guide.
2. Eur J Orthod. 2004 Oct;26(5):553-60.
The effects of argon laser curing of a resin adhesive on bracket retention and
enamel decalcification: a prospective clinical trial.
Elaut J, Wehrbein H.
Departments of Orthodontics, Vrije Universiteit Brussel, Belgium.
A prospective clinical trial was carried out to compare argon laser-curing of a traditional light-activated composite resin with conventional visible light-curing in terms of bond failure rate and incidence of enamel decalcification. Forty-five patients with a total of 742 metal brackets bonded to the upper and/or lower teeth in a modified split-mouth design participated in the study. The adhesive (Transbond XT) on the control teeth was cured by conventional visible light for 40 seconds, and the experimental teeth were exposed to 10 seconds of 250 mW argon laser irradiation. The patients were monitored for a period of 14 months. Intraoral photographic slides of the maxillary anterior teeth (212 in total) were taken at the beginning of treatment, after 12 months of treatment, following application of a plaque disclosing agent, and at the end of the observation period, following temporary debonding. Seven dentists used standardized rating systems to evaluate decalcification and plaque accumulation. The results of this study indicated that there were no significant differences between curing methods for the incidence of decalcification and plaque accumulation. However, the 10 second argon laser-curing method showed a statistically lower bond failure rate (2.4 per cent, P < 0.05) than the 40 second conventional visible light-curing method (5.7 per cent). It is concluded that the use of argon laser curing is superior to that of conventional light-curing with respect to bond failure and chairside time. However, the incidence of decalcification seems to be similar.
3. Br J Oral Maxillofac Surg. 2010 Mar 25. [Epub ahead of print]
Reconstruction of maxillary defects with serratus anterior muscle and angle of
the scapula.
Ilankovan V, Ramchandani P, Walji S, Anand R.
Poole Hospital, Longfleet Road, Poole, Dorset BH15 2JB, UK.
Large maxillary defects ideally require reconstruction with a free flap. Varied classifications have been reported to describe maxillary/orbital defects. We describe our experience of free flaps in large maxillary defects using composite tissue of serratus anterior muscle and the angle of the scapula. Eleven patients (6 men and 5 women, age range 42-69 years) were studied retrospectively and the outcome was recorded. We conclude that the composite flap is versatile enough to reconstruct maxillary defects of various sizes.
4. Clin Implant Dent Relat Res. 2010 May 11. [Epub ahead of print]
Accuracy and Complications Using Computer-Designed Stereolithographic Surgical
Guides for Oral Rehabilitation by Means of Dental Implants: A Review of the
Literature.
D'haese J, Van De Velde T, Komiyama A, Hultin M, De Bruyn H.
Tandkliniek Sint-Lievens-Houtem, Sint-Lievens-Houtem, Belgium.
Background: In the last decade several stereolithographic guided surgery systems were introduced to the market. In this context, scientific information regarding accuracy of implant placement and surgical and prosthodontical complications is highly relevant as it provides evidence to implement this surgical technique in a clinical setting. Purpose: To review data on accuracy and surgical and prosthodontical complications using stereolithographical surgical guides for implant rehabilitation. Material and Methods: PubMed database was searched using the following keywords: "three dimensional imaging,""image based surgery,""flapless guided surgery,""customized drill guides,""computer assisted surgery,""surgical template," and "stereolithography." Only papers in English were selected. Additional references found through reading of selected papers completed the list. Results: In total 31 papers were selected. Ten reported deviations between the preoperative implant planning and the postoperative implant locations. One in vitro study reported a mean apical deviation of 1.0 mm, three ex vivo studies a mean apical deviation ranging between 0.6 and 1.2 mm. In six in vivo studies an apical deviation between 0.95 and 4.5 mm was found. Six papers reported on complications mounting to 42% of the cases when stereolithographic guided surgery was combined with immediate loading. Conclusion: Substantial deviations in three-dimensional directions are found between virtual planning and actually obtained implant position. This finding and additionally reported postsurgical complications leads to the conclusion that care should be taken whenever applying this technique on a routine basis.
5. Rev Belge Med Dent. 2003;58(3):137-44.
Low viscosity composites as materials for orthodontic bonding.
Asscherickx K, Elaut J, Vande Vannet B, Wehrbein H.
Vrije Universiteit Brussel, Institut de Médecine Dentaire, Département
d'Orthodontie et d'Orthopédie Maxillo-faciale, Laarbeeklaan 103, B-1090 Jette.
A new type of composite materials, referred to as low viscosity composites, has been introduced onto the dental market. Little has been published yet concerning the biological and mechanical properties of these new materials, and the practitioner has to rely on the information, provided by the manufacturer. The low viscosity composites are hybrid composites, with a decreased amount of filler particles. This results in a lower viscosity, which makes these materials more appropriate in certain situations. Since the filler loading of these materials is decreased, one could expect inferior mechanical properties, compared to the conventional and hybrid composites. Therefore, the indications for using low viscosity composites are limited. In this article we propose to use low viscosity composites for the bonding of lingual retainers and implant-borne transpalatal arches. The explicit feature of flow, is very attractive for these indications, because a minimum of finishing is needed, when a low viscosity composite is used in these situations. Since there is no direct occlusal bite force put on the composite, the fact that the mechanical properties of a low viscosity composite could be inferior to those of a conventional composite, can be disregarded. A protocol for fixing lingual retainers and implant-borne transpalatal arches is proposed in the article, with other tips, concerning the fabrication of the retainers themselves.
6. Rev Belge Med Dent. 2003;58(3):145-71.
The armamentarium of the periodontologist
D'Haese J, Dombret B, Verelst K, Wyn I, Matthijs S, Moradi M.
Département de Science Dentaire, Service de parodontologie, Vrije Universiteit
Brussel, Laarbeeklaan 103, 1090 Brussel.
The aim of this article is to describe the products available to the periodontist for the regeneration of bone and periodontal tissues. According to distinct biological mechanisms responsible for their regenerative potential, these products can be classified upon three groups: bone substitutes, membranes and enamel matrix proteins. The rationale for trying to regenerate the periodontium after the initial non-surgical phase of the periodontal treatment is discussed. The indications of these products according to their biological principles are described as well as their limitations. The safety of the products of allogenic origin is discussed.
7. J Clin Orthod. 2002 Oct;36(10):597-8.
Flowable composites for bonding lingual retainers.
Elaut J, Asscherickx K, Vande Vannet B, Wehrbein H.
Department of Orthodontics and Dentofacial Orthopedics, Free University of
Brussels, 103 Laarbeeklaan, B-1090 Brussels, Belgium.
8. Am J Med Genet. 1997 Jun 13;70(3):211-5.
Ectodermal dysplasia, cleft lip/palate, and severe cutaneous and osseous
syndactyly in a mentally retarded girl: a new multiple malformation syndrome.
Freihofer HP, Walji S, Brunner HG.
Department of Oral and Maxillofacial Surgery, University Hospital Nijmegen, The Netherlands.
A 13-year-old mentally retarded girl with severe cutaneous and osseous syndactyly of the hands and feet, cleft lip/palate, and ectodermal dysplasia is presented. We conclude that the pattern of malformations described represents a new multiple malformation syndrome. A comparison with Zlotogora-Ogür syndrome is presented.
9. J Clin Periodontol. 1996 Aug;23(8):717-23.
The importance of immunoglobulin-breakdown supporting the growth of bacteria in oral abscesses.
Jansen HJ, van der Hoeven JS, Walji S, Göertz JH, Bakkeren JA.
Department of Periodontology and Preventive Dentistry, University of Nijmegen,
The Netherlands.
Oral bacteria play an important rôle in the causation of oro-facial abscesses. However, they can also be involved in brain, liver and lung abscesses. To persist, it is essential that these bacteria can grow on those sites. The main source of nutrients for growth in abscesses is likely to be tissue exudate, which is rich in serum-derived proteins, and relatively poor in free amino acids and carbohydrates. Degradation of intact proteins seems a crucial step in providing the peptides necessary for energy generation. The aim of this study was to investigate the capacity of microorganisms from asscesses to degrade serum proteins, in particular immunoglobulins. To this end, samples were taken by aspiration from 16 odontogenic abscesses. It was found that pus from abscesses differed strongly in the concentration of viable bacterial cells. The ability of the abscess microflora to degrade serum proteins was investigated after growth of the sample in heat-inactivated human serum. The microflora from abscesses with a high concentration (n = 10) of bacteria strongly degraded immunoglobulins, whereas breakdown of immunoglobulins was virtually absent after growth of the microflora from low-bacterial concentration (n = 6) abscesses. Bacteriological analyses revealed the presence of at least one proteinase-producing species, like Porphyromonas, black-pigmented Prevotella species, or Actinomyces meyeri, in abscesses with a high density of bacteria, but not in those with low bacterial density. The results indicate that the capacity to degrade intact proteins, in particular immunoglobulins, is a major determinant of bacterial growth in abscesses.
10. J Craniomaxillofac Surg. 1996 Apr;24(2):131.
The sandwich zygomatic osteotomy.
Walji S.
Comment on: J Craniomaxillofac Surg. 1995 Feb;23(1):12-9.
