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Title Z100 Is Not Superior To Any Other Composite Resin Material In Posterior Class 1 Restorations
Clinical Question In an adult dental patient in need of a Class 1 composite restoration, does Z100 as compared to other composite materials provide better marginal adaptation and wear resistance 2 years post-operative?
Clinical Bottom Line The two articles are contradictory in their conclusions. According to Abdalla, compared to other composite resin materials, Z100 provides greater anatomic form and marginal adaptation in class 1 posterior composite restorations. According to Turkun, Z100 is not necessarily superior to other resin composites but is just as suitable as others in posterior restorations. Since the Turkun study is more recent, its statements may be more valid.
Best Evidence (you may view more info by clicking on the PubMed ID link)
PubMed ID Author / Year Patient Group Study type
(level of evidence)
#1) 11217593Turkun/200188 Class 1 and 32 Class 2 restorationsNon-randomized Clinical Comparison
Key resultsThere was no evidence of secondary caries in restorations using any of the three materials upon radiographic examination (P≥.05). Relative to marginal adaptation, 11.5% of the Z100 and 16.7% of the Prisma TPH restorations showed evidence of a slight crevice along the marginal interface (P≤.05). The surfaces of all Prisma TPH restorations except one were smooth (P≥.05).
#2) 9002789Abdalla/1996120 Class 1 cavitiesRandomized Control Trial
Key resultsZ100 was rated the best composite in all tested criteria after 1 year. Z100 had a significantly higher value than other groups in regard to anatomic form evaluation. Heliomolar RO had the lowest percentage of marginal adaptation. After 2 years, the anatomic form evaluation showed Z100 was significantly higher than those for Clearfil PP and Heliomolar RO restorations (P<0.04). For marginal adaptation, restorations with Heliomolar RO showed a significantly lower percentage of Alfa ratings than other groups (P<0.02).
Evidence Search ("Z100 composite resin" [Supplementary Concept]) AND "Heliomolar" [Supplementary Concept]
Comments on
The Evidence
In the Turkun study, the groups were similar at the start. One operator prepared, restored and finished 120 cavities following standard procedures and manufacturer’s directions. Groups were treated the same. The restorations were rated by blind examiners. The Abdalla study used the USPHS criteria to evaluate the restorations 1 and 2 years post-operative. Groups were similar at the start and the completion rate was greater than 80% for both the 1-year and 2-year post-operative studies. Distribution of materials and tooth location were randomized, but all other aspects of the study were the same for each patient. This study was performed in 1996 and advances in dental materials may contradict the conclusions that were made.
Applicability The Turkun study concludes that all the materials used are suitable for posterior restorations. The Abdalla article shows that Z100 is a superior composite resin material in a patient in need of a class 1 restoration.
Specialty/Discipline (General Dentistry)
Keywords Acrylic resin, Composite resin, Dentin-bonding agents, Resin cements, Dental marginal adaptation
ID# 2282
Date of submission: 04/12/2012spacer
E-mail desait@livemail.uthscsa.edu
Author Tina Desai
Co-author(s) e-mail
Faculty mentor/Co-author E. Penn Jackson, DDS
Faculty mentor/Co-author e-mail JacksonEP@uthscsa.edu
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