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31 May 2024 (Vol 47 , Iss 05 )

Journal ID : TMJ-02-06-2022-11300
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Title : A comparative laboratory study to evaluate the marginal fit of two types of temporary prostheses.

Abstract :

Comparison of the marginal fit of temporary crowns made by the direct method and those made by the indirect method (CAD-CAM). When we prepare the teeth, we remove some of tooth tissues or restorations form the abutment. and after we finish the preparation the tooth will be uncover and we can't make a proper final restoration immediately because of the time that we need to manufacture the restoration in the laboratory so the practices should give their patient a provisional restoration covers the space of the final one. so that the provisional restoration consider as a main part in treatment plan for fixed prosthodontics patient and this restoration must have a good marginal fit, and after the adhesive it reduce the marginal leakage to protect the abutment and periodontal tissue. The research sample consisted of / 40 / newly extracted premolars that were divided randomly into two equal groups according to the method used in the manufacture of temporary restoration as follows: (The first group: restoration by the direct method (Trantemp) (The second group: restoration by the the indirect method (PMMA)). The marginal applicability was evaluated under stereo microscope. The results showed that the indirect temporary restoration has achieved better marginal fit, where the marginal gap was less compared with direct temporary restoration. The indirect temporary prostheses (PMMA) achieved better marginal fit than the other types used in the study.

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