Maxillary Sinus Lifting REVIEW ARTICLE

Maxillary Sinus Lifting REVIEW ARTICLE

IJEDS 10.5005/jp-journals-10029-1181Maxillary Sinus Lifting REVIEW ARTICLE Maxillary Sinus Lifting 1H Yildiz, 2R Barbaros, 3Nilsun Bagis ABSTRACT Maxillary sinus augmentation was first reported by Tatum 9,10 The use of dental implants in the restoration of toothless areas is et al., and long-term results suggest that the technique is quite common. However, in some cases, we can not use favorable an effective treatment option.11 implants in the maxillary molar region. This is because atrophy This compilation is intended to explain the current is observed following tooth extraction in this region. If an implant methods of sinus augmentation in cases where there is not is desired in these areas, there may not be enough bone height, especially if the period between tooth extraction and implant con- enough volume for implantation in the intended region struction is too long. In some cases, restorations are performed and to draw attention to the issues to be considered.12 with short implants, curved implants, and zygoma implants, but these implants do not have sufficient strength against extreme Indications of Sinus Lifting Operation occlusal forces. Therefore, augmentation of the maxillary sinus is required to use suitable implants, where the atrophied maxil- • Oro-antral fistula treatment lary can be more resistant to occlusal forces in the molar region. • Reconstruction of palate clefts This review aims to evaluate the current methods and • Interpositional graft with Le Fort I fractures materials used in sinus augmentation and also explain about • Less than 10 mm alveolar residual bone height complications and treatments that are frequently encountered • Less than 4 mm residual bone width during and after the operation. • No history of any pathology Keywords: Implant dentistry, Osseos surgery, Sinus lifting. • In the past, a major sinus disease has not been passed How to cite this article: Yildiz H, Barbaros R, Bagis N. Maxil- lary Sinus Lifting. Int J Experiment Dent Sci 2018;7(2):91-97. Local Contraindications of Sinus Lifting Source of support: Nil Operation Conflict of interest: None • Maxillary sinus infections and pathological lesions • Chronic sinusitis BACKGROUND • Alveolar scar possibility Dental implants are increasingly used in the restoration • Odontogenic infections of partial and totally toothless areas.1 However, applying • Allergic rhinitis this treatment in maxillary posterior toothless regions is • The presence of an irregular alveolar crest hampered by inadequate bone volume resulting in buccal- General Contraindications of Sinus Lifting 2 palatal and apical-coronal atrophy of the bone. With the Operation pushing of molar teeth at the base of the sinus, osteoclastic activity increases, and bone loss accompanies the enlarge- • High doses of radiation in the head and neck region ment of the lower part of the maxillary sinus.3 Conventional • Sepsis non-regenerative therapies such as short implants, curved • Advanced medical conditions • Uncontrolled systemic disturbances implants, pterygoid implants, and zygoma implants can be • Excessive smoking, alcohol or substance consumption placed in posterior maxillary regions.4-7 Curved implants • Psychological problems and short implants not quite suitable for the long-term sur- vival and strong occlusal forces in this region,8 so implants METHODS OF MAXILLARY SINUS LIFTING of length and diameter more resistant to occlusal forces should be placed by regenerating the atrophic maxillary. It can be entered from four different regions to the sinus area: I. Superior-lateral wall (Caldwell-Luc): Entry from the 1,2 3 Research Assistant, Associate Professor anterior of the zygomatic arch. 1-3Department of Periodontology, Faculty of Dentistry, Ankara University, Ankara, Turkey II. Mid-lateral wall: Entered between alveolar crest and Corresponding Author: Nilsun Bagis, Associate Professor, zygomatic arch. Department of Periodontology, Faculty of Dentistry, Ankara III. Inferior-lateral wall: It is entered from alveolar crest University, Ankara, Turkey, Phone: 00 90 312 296 56 40, e-mail: level (Lateral window technique/external lifting) [email protected] I V. Krestal osteotomy (closed technique/internal lifting) International Journal of Experimental Dental Science, July-December 2018;7(2):91-97 91 H Yildiz et al. The most commonly used methods in the clinic are Internal Sinus Lifting an inferior-lateral wall and closed sinus lifting methods. Krestal osteotomy technique was first described by External technique for creating a bone window in the Summers in 1994 as a less invasive technique of apically vestibular wall of the sinus. After that, the sinus epi- compressing the sinus floor in the sinus direction and thelium was gently raised to create a space for bone removing the Schneiderian membrane.16 This technique grafting. The healing period took about 6 months. In is a good option for patients with bone heights greater addition, the one-stage approach was demonstrated, in than 5–7 mm.13 Several studies have reported a good which sinus augmentation and implantation are per- survival rate (from 93.5–100%) for implants placed sinus formed in one surgery while the two-stage approach using this technique.17 had the implantation taking place after several months After removal of the osteotomy site either by flap of sinus augmentation. The abovementioned technique removal or by flapless technique, a 2 mm drill is used to has been known as sinus lifting with the lateral window remove the bone from the sinus floor up to 1 mm.17 The and is still widely used in modern implant dentistry due osteotomy is extended with osteotomy drills of 0.5–1.2 to its reliable efficiency. mm from the implant size or a series of osteotomes. The bone particles are inserted into the osteotomy and gently Lateral Window Technique (External Sinus pushed towards the sinus. The breaking of the sinus base Lifting) can be detected by a change in resistance between the osteotomy and bone or by a change in the sound of the Side window technique, which is often used to reach the beat. As the membrane increases the risk of puncture, maxillary sinus and augment the area; the maxillary is the osteotomy should be avoided from advancing into the elevation of the sinus floor by obtaining a window-like the sinus.16,17 cavity from the side wall of the sinus. Nerve blockage is Alveolar crest should be well assessed when the achieved by local anesthesia for this procedure. A vertical method is determined. Suggestions on this subject are:18 incision is made at sagittal, mesial or distal (if necessary • 8 mm residual bone height and flat sinus floor: Standard both sides) top of the crest. The lower edge of the window implant placement. should be 3 mm above the sinus floor, the posterior edge • ≥ 8 mm residual bone height and sinus floor: Elevation on the tuber, and the anterior edge 3 mm distal from the of maxillary sinus floor using osteotomy technique anterior wall of the sinus.13 without standard implant placement using a short There are two methods used when creating windows implant or without graft material. on the sinus wall: (1) Incomplete fracture, (2) Removed • 5–7 mm residual bone height and relatively flat sinus floor: bone wall method. In the incomplete fracture method, Elevation of the maxillary sinus floor using osteotomy the sinus side wall is folded and placed in the sinus technique with resorption-resistant graft material. cavity. Thus, there is autogenous bone between the • 5–7 mm residual bone height and oblique sinus floor: MaxilLary sinus floor elevation and simultaneous sinus floor and the graft material in the form of bone implant placement using the lateral approach with ischemia. In the bone wall removal method, the bone graft material marrow is completely removed at the desired border. • 3–4 mm residual bone height and flat or oblique sinus floor: In both methods, after obtaining the sidewall window, Elevation of maxillary sinus floor using the lateral the sinus membrane is removed from the bone using approach with graft material. special instruments and carefully positioned if the graft • 1–2 mm residual bone height and flat or oblique sinus material is to be placed. Thus, a vertical area is obtained floor: Raising the maxillary sinus floor using a lateral between the sinus membrane and the alveolar crest. approach with graft material and placement of Conventional rotary tools or piezoelectric are used delayed implant after 4–8 months. while creating the sine sidewall window. Jordi et al. According to the study published in 2018, the perfora- BIOMATERIALS USED IN MAXILLARY SINUS tion rate of the Schneiderian membrane is 24% in con- AUGMENTATION ventional procedures, whereas the rate of perforation in Sinus lifting was first described as a surgical technique 14 piezoelectric surgery is about 8%. for creating a bone window in the vestibular wall of the Many researchers have suggested the placement of sinus. After that, the sinus epithelium was gently raised membranes after surgery on the sinus lateral wall for the to create a space for bone grafting. Bone harvesting purpose of increasing new bone formation.9,15 was performed in the iliac crest area and then placed 92 IJEDS Maxillary Sinus Lifting in the prepared space. The healing period took about 6 BASF ChemTrade GmbH, Burgbernheim, Germany). An months before implantation. The use of autogenous bone, important feature of this mixture is that it remains liquid allograft and alloplast material for bone grafting during at 23°C and becomes denser and more solid at higher sinus augmentation was suggested.19-32 temperatures (about 37°C). For this reason, the poloxamer Autogenous bone graft is accepted as the gold mixture is stably positioned on the surface of the mucous standard in terms of osteogenic potential but has some membrane, allowing the sinus membrane to be raised in disadvantages due to reasons such as the limitations of a stable manner.

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