The aim of this research was to evaluate the mechanical impact of utilizing different fiber-reinforced composite (FRC) systems to reinforce inlay-retained bridges in dissected lower molars with different levels of periodontal support. A total of 24 lower first molars and 24 lower second premolars were included in this study. The distal canal of all molars received endodontic treatment. After root canal treatment, the teeth were dissected, and only the distal halves were kept. Standardized class II occluso-distal (OD) (premolars) and mesio-occlusal (MO) (dissected molars) cavities were prepared in all teeth, and premolar–molar units were created. The units were randomly distributed among four groups (n = six/group). With the aid of a transparent silicone index, direct inlay-retained composite bridges were fabricated. In Groups 1 and 2, both discontinuous (everX Flow) and continuous (everStick C&B) fibers were used for reinforcement, while in Groups 3 and 4, only discontinuous fibers (everX Flow) were used. The restored units were embedded in methacrylate resin, simulating either physiological periodontal conditions or furcation involvement. Subsequently, all units underwent fatigue survival testing in a cyclic loading machine until fracture, or a total of 40,000 cycles. Kaplan–Meyer survival analyses were conducted, followed by pairwise log-rank post hoc comparisons. Fracture patterns were evaluated visually and with scanning electron microscopy. In terms of survival, Group 2 performed significantly better than Groups 3 and 4 (p < 0.05), while there was no significant difference between the other groups. In the case of impaired periodontal support, a combination of both continuous and discontinuous short FRC systems increased the fatigue resistance of direct inlay-retained composite bridges compared to bridges that only contained short fibers. Such a difference was not found in the case of sound periodontal support between the two different bridges.

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Periodontitis is one of the most common conditions affecting oral health among adults, posing a great challenge for both patients and also for dentists aiming to treat this disease. In severe stages such deterioration of the supporting tissues, namely the periodontal ligaments and the bone, can occur, which will affect the biomechanical behavior and therefore the longevity and survival of the affected teeth. In order to be able to plan both periodontal and subsequent restorative treatment properly, valid modelling of the current clinical situation is advised. The aim of the present article is to comprehensively discuss possible analog and digital modeling methods of periodontally affected teeth and the periodontal structures surrounding them. Modelling possibilities can serve later as the basis of mechanical load, digital finite element studies, and also aid clinical treatment planning.

Részleges kivehető fémlemezes műfogsorok a mindennapi betegellátásban gyakran készülnek még napjainkban is.Ezek tervezését a fogorvosnak a biológiai, statikai, anyagtani, esztétikai szempontok szerint és a betegek igényeit, elvárásaitfigyelembe véve kell megvalósítania. Kérdőíves felmérést végeztünk fogtechnikusok körében annak kiderítésére,mennyire valósul meg ez a gyakorlatban. A 64 fogtechnikus válasza szerint a fogorvosoknak alig több mint fele (52%)küld pontos tervet az öntött kapocs elhorgonyzású részleges kivehető fémlemezes műfogsorok készítéséhez a laborba,kapcsok fajtájára nézve 47%-ban érkeznek információk, a nagy összekötők formájára nézve 28%-ban kap útmutatást alabor. Az utasítások 6%-ban rajzosan, 48%-ban írásban, vagy írásban és rajzzal (31%) érkeznek. Az esztétikai problémaesetében felmerülő felelősség a technikust és a fogorvost is terheli a vélemények szerint, akárki végzi a tervezést.A technikusok 86%-a szükségesnek tartotta, hogy a részleges kivehető fémlemezes fogpótlások tervezésében a fogorvosis részt vegyen. Szakirodalmi megállapítások hasonló adatokat mutattak, ennek ellenére helytelen az a gyakorlat,hogy a fogorvosok meglehetősen sokszor a fogtechnikai laborra bízzák a fogsorok megtervezését.

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