Gyökércsúcs rezekciója navigált endodontiai mikrosebészeti technikával = Guided modern endodontic microsurgery by use of a trephine bur

A modern fogászati implantológiában már rutinszerűen alkalmazott sebészi sablonok és háromdimenziós (3D) tervezőprogramok segítségével lehetőség nyílik más szakterületek fejlődésére is. Az operációs mikroszkóppal történő sebészeti gyökércsúcs-eltávolítás sokkal pontosabb rezekciót tesz lehetővé, ám a műtéti terület lokalizálására és méretének meghatározására nyomtatott sebészi sablonok alkalmazására még nincs konkrét ajánlás. Célunk egy új, sablonnal navigált mikrosebészeti gyökércsúcs-rezekciós technika bemutatása, melynek során a számítógépes programban megtervezett ostetotomiát és rezekciót egy körtrepánnal végezzük. A számítógépes programban (SMART Guide; dicomLAB, Szeged) cone-beam computed tomography (CBCT-) felvétel használatával 3D sablont készítünk, mellyel meghatározzuk a rezekciós ablak átmérőjét, a trepán behatolási mélységét és szögét. A teljes vastagságú lebeny kialakítását követően, a dentális megtámasztású, nyomtatott sablont a műtéti területre helyezve, a corticalis csont és a gyökércsúcs eltávolítása trepánnal történik. A műtéti beavatkozás a modern mikrosebészet elveit követi, ennek megfelelően az ultrahangos retrográd preparálást retrográd töméssel, ’mineral trioxide aggregate’ (ProRoot MTA; Dentsply Maillefer, Ballaigues, Svájc) alkalmazásával zárjuk. A komplikációk nélkül lezajlott gyógyulási időszakot követő egyéves kontrollfelvételen a periapicalis laesio telődött, a páciens panaszmentes. A könnyen és nagy pontossággal végrehajtható beavatkozás utáni fájdalommentes gyógyulás mellett a technika nagy előnye, hogy maga a műtéti beavatkozás gyorsabb, mint a sablon és trepán nélküli mikrosebészeti rezekció. = Surgical guides and three-dimensional (3D) planning softwares used in everyday dental implantology open new possibilities in other fields of dentistry. While using the operation microscope in endodontic microsurgery provides more precise apicectomy, there is still no consent on the exact localisation and size of the bony window to be prepared for this surgery. Our aim is to describe a new, guided endodontic microsurgery method when osteotomy and apicectomy are planned in a 3D software and performed with a trephine bur. Based on data from Cone Beam Computed Tomography, planning of the surgical guide was performed with a 3D planning software (Smart Guide, dicomLAB, Hungary) in order to define the size of the bony window, the angulation and the depth of the trephine bur during the apicectomy. After preparing a mucoperiosteal flap, with the help of the dentally supported surgical guide, the trephine bur removes the cortical bone and the apex of the root simultaniously. Following the modern microsurgical protocol, after performing the ultrasonic retrograde preparation, mineral trioxide aggregate (ProRoot MTA; Dentsply Maillefer, Ballaigues, Switzerland) is placed as a retrograde filling to close the resected area. After the uneventful healing period, a complete bony regeneration can be seen on the 1-year follow up X-ray. The patient is symptom-free. This technique is considered to be faster and more precise than the non-guided endodontic microsurgery carried out without the utilization of a trephine bur

Transzmurális szálerősítéses merevítés a nagyméretű MOD kavitások mechanikai ellenállóképességének növelésére – technikai leírás = Transmural fiber reinforcement in order to restore the fracture resistance of large MOD cavities

Korunk táplálkozási szokásai és az ezek következtében népbetegséggé vált caries miatt jelentős számban készülnek egyre nagyobb kiterjedésű, mezio-okklúzio-disztális (MOD) kavitásokba kompozíciós tömőanyagból restaurációk. A modern adhezív restaurátumokkal szemben követelmény, hogy állítsák helyre a fog funkcionális egységét, továbbá erősítsék meg azt, kivédve ezzel a későbbi esetleges foganyag-restaurátum komplexumban kialakuló töréseket. Az MOD kavitások kialakítása jelentős mechanikai gyengüléshez vezet, ami döntően a zárólécek elvesztésének, valamint a kavitás dimenzióinak (mélységének) következménye. Bár a mai kompozitok elődeikhez képest jelentős fejlődésen mentek keresztül, az extrém mélységű MOD kavitások ellátására a hagyományos direkt kompozit restaurátumok alkalmassága erősen megkérdőjelezhető. Több vizsgálat szerint az így ellátott fogak mechanikai ellenállóképessége számottevően csökkent. Cikkünk célja egy olyan új technika bemutatása, ami a kavitás-alakítás során jelentősen meggyengült fogakat képes teherviselőbbé tenni. Az általunk alkalmazott új eljárás, a transzmurális merevítés erős mechanikai kapcsolatot teremt az MOD üreg falai között, így növelve azok ellenállóképességét az okkluzális irányból ható terhelésekkel szemben

Comparison of the Three-Dimensional Accuracy of Guided Apicoectomy Performed with a Drill or a Trephine: An In Vitro Study

Guided apicoectomy performed with 3D-printed polymer-based static surgical guides is an emerging trend in endodontic surgery. Static-guided apicoectomy is carried out with either a drill or a trephine. The aim of this in vitro study was to assess the accuracy of osteotomy and apicoectomy performed through a polymer guide, with both drill and trephine, and to compare the accuracy achievable with the two instruments. Six plaster models of a maxilla master model with extracted human maxillary teeth in polymethyl-methacrylate resin were used. The modeled osteotomies were performed in these. The master model was CBCT-scanned, and digital surgical plans were prepared, based on which the surgical guides were printed. The plans contained both drill and trephine apicoectomies. Digital three-dimensional position analysis was performed with dedicated algorithms. A total of 39 drill and 47 trephine osteotomies were analyzed. A statistically significant difference between the two instruments was found only in the global deviation of the distal endpoint, indicating lower deviation for the trephine procedure (1.53 mm vs. 1.31 mm, p = 0.038). Nevertheless, from a clinical perspective, this distinction is inconsequential. The results suggest that, for all practical purposes, the two approaches to apicoectomy allow the same level of accuracy

Bioblock technique to treat severe internal resorption with subsequent periapical pathology: a case report

A variety of therapeutic modalities can be used for the endodontic treatment of a traumatized tooth with internal root resorption (IRR). The authors present a case report of the successful restoration of a traumatized upper central incisor that was weakened due to severe IRR and subsequent periapical lesion formation. A 20-year-old female patient was referred to our clinic with severe internal resorption and subsequent periapical pathosis destroying the buccal bone wall. Root canal treatment had been initiated previously at another dental practice, but at that time, the patient's condition could not be managed even with several treatments. After cone-beam computed tomography imaging and proper chemomechanical cleaning, the tooth was managed with a mineral trioxide aggregate plug followed by root canal filling using short fiber-reinforced composite, known as the Bioblock technique. This report is the first documentation of the use of the Bioblock technique in the restoration of a traumatized tooth. The Bioblock technique appears to be ideal for restoring wide irregular root canals, as in cases of severe internal resorption, because it can uniquely fill out the hollow irregularities of the canal. However, further long-term clinical investigations are required to provide additional information about this new technique.</p

The potential effect of instrumentation with different nickel titanium rotary systems on dentinal crack formation-An in vitro study

The potential mechanical impact of different rotary systems used for root canal preparation has been a matter of debate for long. The aim of this study was to explore the incidence of dentinal cracks after root canal instrumentation with various rotary systems, in vitro. One hundred and eighty intact lower central incisors were selected and randomly divided into fourteen treatment groups (n = 12/group) and a control group (n = 12). After decoronation, the root canals were instrumented with fourteen different rotary systems (E3, E3 azure, NT2, Hyflex CM, Hyflex EDM, 2Shape, OneCurve, ProTaper Next, ProTaper Gold, WaveOne Gold, Mtwo, Reciproc Blue, TF adaptive, K3XF). All roots were horizontally sectioned at 3, 6, and 9 mm from the apex with a low-speed saw under water-cooling. The slices were then examined under stereomicroscope for dentinal cracks. No cracks were found in the control group. Cracks were found in all treatment groups, predominantly in the 3 mm slices. There was no statistically significant difference in the number of cracks when comparing the different systems to each other at any section level. At 3 mm, however, five of the studied systems, namely K3XF (p = 0.004), Protaper Next (p = 0.001), Reciproc Blue (p<0.001), TF adaptive (p = 0.050), and 2Shape (p = 0.009) presented a significantly higher number of cracks than the control group. Within the limitations of this study, instrumented canals presented dentinal cracks, while uninstrumented ones presented no cracks after sectioning. There seems to be no significant difference among the tested systems regarding crack formation in the instrumented root canal wall. Crack formation occurred irrespective of the motion of the rotary system (rotational or reciprocation). Further studies are needed to clarify the factors that contribute to crack formation in the case of each individual rotary system