Assessment of cuspal deflection and microleakage in Class II composite restorations: Comparative analysis between nanocomposite and bulk-fill composite resin
Background: Composite resins are widely used for esthetic dental restorations, but polymerization shrinkage can cause cuspal deflection and microleakage, compromising restoration longevity. Aim: The study aimed to evaluate cuspal displacement and marginal leakage in Class II restorations employing b...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2025-07-01
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| Series: | Journal of Oral Research and Review |
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| Online Access: | https://journals.lww.com/10.4103/jorr.jorr_24_25 |
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| author | Abhijit Ghosh Priti D. Desai Ipsita Maity Paromita Mazumdar |
| author_facet | Abhijit Ghosh Priti D. Desai Ipsita Maity Paromita Mazumdar |
| author_sort | Abhijit Ghosh |
| collection | DOAJ |
| description | Background:
Composite resins are widely used for esthetic dental restorations, but polymerization shrinkage can cause cuspal deflection and microleakage, compromising restoration longevity.
Aim:
The study aimed to evaluate cuspal displacement and marginal leakage in Class II restorations employing bulk-fill composite resin (Filtek Bulk Fill) and nanocomposite (Filtek Z350 XT).
Materials and Methods:
Thirty-two intact maxillary first premolars obtained immediately postextraction were embedded 3 mm below the cementoenamel junction in acrylic resin. Two composite-filled plastic molds were fixed on the palatal and buccal cusps as points of reference, and buccopalatal widths (BPWs) were measured using a digital micrometer. Standardized Class II mesio–occluso–distal (MOD) cavities (2 mm width and 2 mm depth) were prepared and restored with either nanocomposite (Group A) or bulk-fill composite (Group B). After restoration, BPWs were remeasured to assess cuspal deflection. Samples underwent 500 thermal cycles (5°C–55°C), were stained with 2% methylene blue, and sectioned for microleakage analysis under a stereomicroscope at ×20. Differences between the groups were analyzed, with a significance level of 5%.
Results:
Group A exhibited a greater average cuspal deflection (0.144 ± 0.26 mm) compared to Group B (0.07 ± 0.16 mm), even though this discrepancy was not notably significant (P = 0.3). After thermocycling, Group A also had greater cuspal deflection (P = 0.61) and higher median microleakage (1.5 [1–2.75]) compared to Group B (P = 0.46).
Conclusion:
Nanocomposite showed higher cuspal deflection and microleakage than bulk-fill composite in large MOD cavities, although these differences were not statistically significant. |
| format | Article |
| id | doaj-art-6467bed2c0224196a16d385b10b280ff |
| institution | Kabale University |
| issn | 2249-4987 2394-2541 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Oral Research and Review |
| spelling | doaj-art-6467bed2c0224196a16d385b10b280ff2025-08-20T03:59:25ZengWolters Kluwer Medknow PublicationsJournal of Oral Research and Review2249-49872394-25412025-07-0117210711210.4103/jorr.jorr_24_25Assessment of cuspal deflection and microleakage in Class II composite restorations: Comparative analysis between nanocomposite and bulk-fill composite resinAbhijit GhoshPriti D. DesaiIpsita MaityParomita MazumdarBackground: Composite resins are widely used for esthetic dental restorations, but polymerization shrinkage can cause cuspal deflection and microleakage, compromising restoration longevity. Aim: The study aimed to evaluate cuspal displacement and marginal leakage in Class II restorations employing bulk-fill composite resin (Filtek Bulk Fill) and nanocomposite (Filtek Z350 XT). Materials and Methods: Thirty-two intact maxillary first premolars obtained immediately postextraction were embedded 3 mm below the cementoenamel junction in acrylic resin. Two composite-filled plastic molds were fixed on the palatal and buccal cusps as points of reference, and buccopalatal widths (BPWs) were measured using a digital micrometer. Standardized Class II mesio–occluso–distal (MOD) cavities (2 mm width and 2 mm depth) were prepared and restored with either nanocomposite (Group A) or bulk-fill composite (Group B). After restoration, BPWs were remeasured to assess cuspal deflection. Samples underwent 500 thermal cycles (5°C–55°C), were stained with 2% methylene blue, and sectioned for microleakage analysis under a stereomicroscope at ×20. Differences between the groups were analyzed, with a significance level of 5%. Results: Group A exhibited a greater average cuspal deflection (0.144 ± 0.26 mm) compared to Group B (0.07 ± 0.16 mm), even though this discrepancy was not notably significant (P = 0.3). After thermocycling, Group A also had greater cuspal deflection (P = 0.61) and higher median microleakage (1.5 [1–2.75]) compared to Group B (P = 0.46). Conclusion: Nanocomposite showed higher cuspal deflection and microleakage than bulk-fill composite in large MOD cavities, although these differences were not statistically significant.https://journals.lww.com/10.4103/jorr.jorr_24_25bulk fillcomposite restorationscuspal deflectionmicroleakagenanocomposite |
| spellingShingle | Abhijit Ghosh Priti D. Desai Ipsita Maity Paromita Mazumdar Assessment of cuspal deflection and microleakage in Class II composite restorations: Comparative analysis between nanocomposite and bulk-fill composite resin Journal of Oral Research and Review bulk fill composite restorations cuspal deflection microleakage nanocomposite |
| title | Assessment of cuspal deflection and microleakage in Class II composite restorations: Comparative analysis between nanocomposite and bulk-fill composite resin |
| title_full | Assessment of cuspal deflection and microleakage in Class II composite restorations: Comparative analysis between nanocomposite and bulk-fill composite resin |
| title_fullStr | Assessment of cuspal deflection and microleakage in Class II composite restorations: Comparative analysis between nanocomposite and bulk-fill composite resin |
| title_full_unstemmed | Assessment of cuspal deflection and microleakage in Class II composite restorations: Comparative analysis between nanocomposite and bulk-fill composite resin |
| title_short | Assessment of cuspal deflection and microleakage in Class II composite restorations: Comparative analysis between nanocomposite and bulk-fill composite resin |
| title_sort | assessment of cuspal deflection and microleakage in class ii composite restorations comparative analysis between nanocomposite and bulk fill composite resin |
| topic | bulk fill composite restorations cuspal deflection microleakage nanocomposite |
| url | https://journals.lww.com/10.4103/jorr.jorr_24_25 |
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