Accuracy and dimension stability of scannable versus conventional interocclusal registration materials: An in vitro study

Statement of problem. Scientific data to support scannable and computer-aided design and computer-aided manufacturing (CAD-CAM)-compatible interocclusal registration materials are lacking.Purpose. The purpose of this in vitro study was to evaluate the ability of different registration materials (conventional versus scannable) to record maxillary-mandibular relationships and compare the dimensional stability of these records after storage times of 1 hour and 48 hours.Material and methods. Six groups of interocclusal registration materials were tested: 3 conventional (Registrado X-tra, Futar D Fast, and O-Bite) and 3 scannable (Registrado Scan, Futar Cut & Trim Fast, and O-Bite Scan). Eight registrations were made for each group by using a custom-made device with a dial gauge to measure vertical discrepancies. Records were stored at room temperature, and discrepancies measured after 1 hour and 48 hours. The data were statistically analyzed with the Wilcoxon test with respect to time and the Kruskal-Wallis test with respect to materials, followed by the Mann-Whitney test with the Bonferroni-Holm correction (a=.05).Results. The median vertical discrepancies ranged from-2 mm (FS) to 11 mm (O-Bite) after 1 hour and from 3 mm (Futar Cut & Trim Fast) to 13 mm (Registrado X-tra and O-Bite) after 48 hours. A statistically significant difference (P<.001) was found between the results after 1 hour and 48 hours for all materials. All scannable interocclusal registration materials showed significantly lower vertical discrepancies than the corresponding conventional materials after 1 hour and 48 hours (P<.05).Conclusions. All registration materials showed vertical discrepancies that might be clinically acceptable. Vertical discrepancies increased after 48 hours of storage for all materials but were still clinically acceptable. (J Prosthet Dent 2023;130:119-23)

Automated summary

This study evaluates the ability and dimensional stability of different registration materials (conventional versus scannable) for recording maxillary-mandibular relationships. The results show that scannable interocclusal registration materials have significantly lower vertical discrepancies after storage.