+90 538 073 12 11
TR EN
MenuClose
Phone: +90 538 073 12 11
TR EN

CLINICAL GUIDE · COMPOSITES AND ADHESION

Longevity of direct composite veneers: indication, repair and maintenance

Dr. Ferit Çiftçi · Last updated: 5 November 2026 · Sources checked: 5 November 2026

CLINICAL SUMMARY

In randomised trials with at least two years of follow-up (mean 24 to 97 months), the pooled survival of resin composite veneers was 88%; this figure is not specific to direct veneers or to a fixed time point. Within the review, direct veneers showed higher survival than indirect composite veneers.1 Reported complications mostly concern surface, colour and margins, and most were regarded as clinically acceptable with or without reintervention.1 For a partly defective restoration, repair is a conservative option; no significant difference in failure rates from replacement has been shown, but the confidence interval is wide and certainty is low, so this does not demonstrate equivalence.2 In laboratory studies on aged composites, the highest repair bond strength was obtained with a diamond bur, silane and adhesive.2, 3

This article is written for dentists; it is not patient information or a treatment recommendation. It is not a peer-reviewed publication; it is a literature-based clinical guide by Dr. Ferit Çiftçi. References and a methods note are at the end.

On this page

Who is it suitable for?

The German S3 guideline describes composites as a viable option for direct restoration of Class I to V cavities and states that they may also be used for cusp replacement and tooth shape corrections.4 Freehand direct composite veneers are described as a minimally invasive approach for managing aesthetic alterations in anterior teeth.5

The review by Lim and colleagues included 3 randomised and 4 cohort studies; mean follow-up of the randomised trials ranged from 24 to 97 months, and the direct veneer group showed higher survival than the indirect composite veneer group.1 In a meta-analysis of direct anterior restorations, the estimated median success (restorations not replaced) after 10 years was 95% for Class III and 90% for Class IV; these are Class III and IV data, not veneer-specific estimates, and 18 of the 21 included trials started before 2001.6

What matters for longevity?

In a systematic review of 25 studies that together covered Class III and IV restorations, veneers and full-coverage restorations placed for aesthetic reasons, and restorations in worn teeth, annual failure rates of direct anterior composites ranged from 0% to 27.11%, and fracture was the main cause. Factors associated with failure were adhesive technique, type of composite, replacement of the first restoration and the time taken.7 In Class IV, the main reason for replacement was bulk fracture, which was more frequent with microfilled composites than with hybrid and macrofilled ones.6 Of these factors, the adhesive protocol and the choice of material are operative decisions; adhesive choice is covered in a separate article.

Aesthetic parameters also change over long-term follow-up. In freehand anterior composites followed for at least 24 months, the pooled proportions across eight studies were 14% for colour alteration, 21% for marginal discolouration and 21% for change in surface quality; variation between studies was large (prediction intervals 0% to 63%, 0% to 68% and 0% to 74%). The authors stress that the absence of recorded deterioration does not by itself mean aesthetic success.5 These findings make polishing, regular review and repair when needed part of the maintenance plan; surface care is covered in the finishing and polishing article.

On isolation, a Cochrane review reports with low certainty that rubber dam may be associated with fewer failures of cervical composites than cotton rolls at six months; at other time points the evidence is very uncertain.8

Repair or replace?

A 2026 umbrella review of seven systematic reviews found no significant difference in failure rates between repaired and replaced restorations (RR 1.21; 95% CI 0.51 to 2.83; low certainty); with a confidence interval this wide, the absence of a difference does not show equivalence. A network meta-analysis of laboratory studies found the highest bond strength with a diamond bur, silane and adhesive. In the studies included in the review, only 31.3% of defective restorations were repaired; the abstract does not describe their settings, so this is not a general practice rate. Standardised decision tools were lacking.2 The same estimate (RR 1.21; 95% CI 0.51 to 2.83) was reported by a meta-analysis of three clinical studies covering resin composite and amalgam restorations, which rated the risk of bias high and the certainty of evidence very low.13

A Cochrane review of defective composites in posterior teeth found no randomised trial answering this question up to July 2013.9 In a meta-analysis of patient acceptance, 86.3% of dentists and students reported that their patients accept or prefer repair; this is the dentists' report, as none of the studies asked patients directly.10

Step-by-step repair protocol

  1. Define the extent of the defect and grade it. The revised FDI criteria link scores to reviewing or monitoring (scores 1 to 4), refurbishment or resealing (3), repair (4) and replacement (5).14
  2. Before treatment, discuss the suitable options with the patient, from monitoring to replacement; in surveys of dentists and dental students, most reported that their patients accept or prefer repair; patients were not asked directly.10
  3. Isolate the field.8
  4. Roughen the old composite surface with a diamond bur. In a laboratory network meta-analysis of aged methacrylate-based composites, mechanical surface treatment gave higher bond strength when combined with chemical agents.3
  5. If enamel is exposed, etch it with phosphoric acid before the silane and adhesive, following the instructions; the S3 guideline, in its recommendations on composite restoration processing that are not specific to repair, recommends phosphoric acid etching for restoration quality.12 Manage exposed dentin according to the instructions of the adhesive used.
  6. Apply silane to the roughened composite; silane before the adhesive significantly increased repair bond strength in the laboratory.3, 11 The silane meta-analysis reported high heterogeneity and studies at medium to high risk of bias.11
  7. Apply the adhesive and light-cure it according to the material instructions. In the laboratory network meta-analysis, total-etch and self-etch protocols did not differ in repair bond strength.3
  8. Place the repair composite and light-cure it according to the material instructions; the S3 guideline underlines the crucial role of light polymerisation.12
  9. Complete finishing and polishing; the same guideline recommends polishing for surface quality.12

Common errors and fixes

ErrorFix
Replacing the whole restoration for a limited defect.Grade the defect and consider monitoring, refurbishment or repair. Repair is more conservative, and no difference in failure from replacement has been shown (low to very low certainty).2, 13, 14
Preparing old composite with adhesive alone.Roughen with a diamond bur and add silane before the adhesive; in laboratory studies on aged composites this combination gave the highest bond strength.3, 11
Treating the adhesive strategy as the main driver of repair success.In the laboratory, total-etch and self-etch did not differ in repair bond strength; this does not show that the strategy is clinically unimportant. The highest bond strength came from mechanical preparation followed by silane and adhesive.3, 11
Taking the absence of recorded deterioration as aesthetic success.Assess and record colour, margins and surface separately at reviews; the revised FDI criteria also cover functional and biological domains such as fracture, marginal adaptation, occlusion and caries at the margin.5, 14
Restoring Class IV with microfilled composite alone.Bulk fracture was reported more often with microfilled than with hybrid and macrofilled composites. Take this into account in material selection; most included trials started before 2001, and whether this applies to contemporary composites cannot be determined from this abstract.6

Level of evidence

What is known

Resin composite veneers showed moderately high pooled survival in randomised trials (88%), and the direct group had higher survival than the indirect composite veneer group.1 No difference in failure between repair and replacement has been shown; the confidence interval is wide and certainty is low to very low, so this is not evidence of equivalence.2, 13 A diamond bur, silane and adhesive together gave the highest repair bond strength in laboratory studies on aged composites; this is a bond-strength finding, not a clinical survival result.2, 3

What is not known

This search found no source on recall intervals, so no interval is recommended; the revised FDI criteria offer a framework for assessing restorations at reviews.14 Aesthetic outcome data vary widely between studies.5 Whether randomised trials compare repair with replacement in anterior teeth was not established here: the cited Cochrane review covered only posterior teeth up to July 2013, and this article's search prioritised reviews, meta-analyses and guidelines.9 Patient views were measured only through dentists' reports.10 Certainty levels of the guideline recommendations are not given in the abstracts and are therefore not stated here.

At the chair

  • Is the defect limited: staining, a margin or a small fracture?
  • Have monitoring, refurbishment, repair and replacement been discussed before treatment?
  • Are a diamond bur, silane and adhesive ready?
  • Will exposed enamel be etched with phosphoric acid before silane and adhesive?
  • Are the adhesive and the repair composite light-cured according to the instructions?
  • Are finishing and polishing complete?
  • Are colour, margins and surface recorded at reviews?

References

  1. Lim TW, Tan SK, Li KY, Burrow MF. SURVIVAL AND COMPLICATION RATES OF RESIN COMPOSITE LAMINATE VENEERS: A SYSTEMATIC REVIEW AND META-ANALYSIS. J Evid Based Dent Pract. 2023;23(4):101911. PMID: 38035903 · DOI: 10.1016/j.jebdp.2023.101911
  2. Fernández E, Martín J, Angel P, Caviedes R, Díaz L, Bersezio C. Repair of Resin Composite Restorations: An Umbrella Review of Systematic Reviews. Oper Dent. 2026;50(5):477-490. PMID: 41483821 · DOI: 10.2341/25-072-LIT
  3. Hadilou M, Dolatabadi A, Ghojazadeh M, Hosseinifard H, Alizadeh Oskuee P, Pournaghi Azar F. Effect of Different Surface Treatments on the Long-Term Repair Bond Strength of Aged Methacrylate-Based Resin Composite Restorations: A Systematic Review and Network Meta-analysis. Biomed Res Int. 2022;2022:7708643. PMID: 37964860 · DOI: 10.1155/2022/7708643
  4. Wolff D, Frese C, Frankenberger R, Haak R, Braun A, Krämer N, et al. Direct Composite Restorations on Permanent Teeth in the Anterior and Posterior Region - An Evidence-Based Clinical Practice Guideline - Part 1: Indications for Composite Restorations. J Adhes Dent. 2024;26:185-200. PMID: 39286910 · DOI: 10.3290/j.jad.b5748881
  5. Chauca-Bajaña L, Zambrano Manzaba GG, Campos Lascano LF, Teran Sanchez NJ, Ordoñez Balladares A, Ordoñez Balladares MA, et al. Long-Term Aesthetic Performance of Freehand Direct Anterior Composite Resin Restorations: A Systematic Review and Meta-Analysis of Colour Alteration, Marginal Discolouration, and Surface-Quality Deterioration. Dent J (Basel). 2026;14(10):633. PMID: 42930399 · DOI: 10.3390/dj14100633
  6. Heintze SD, Rousson V, Hickel R. Clinical effectiveness of direct anterior restorations--a meta-analysis. Dent Mater. 2015;31(5):481-95. PMID: 25773188 · DOI: 10.1016/j.dental.2015.01.015
  7. Shah YR, Shiraguppi VL, Deosarkar BA, Shelke UR. Long-term survival and reasons for failure in direct anterior composite restorations: A systematic review. J Conserv Dent. 2021;24(5):415-420. PMID: 35399771 · DOI: 10.4103/jcd.jcd_527_21
  8. Miao C, Yang X, Wong MC, Zou J, Zhou X, Li C, et al. Rubber dam isolation for restorative treatment in dental patients. Cochrane Database Syst Rev. 2021;5(5):CD009858. PMID: 33998662 · DOI: 10.1002/14651858.CD009858.pub3
  9. Sharif MO, Catleugh M, Merry A, Tickle M, Dunne SM, Brunton P, et al. Replacement versus repair of defective restorations in adults: resin composite. Cochrane Database Syst Rev. 2014;2014(2):CD005971. PMID: 24510679 · DOI: 10.1002/14651858.CD005971.pub3
  10. Lechte C, Schlarmann F, Biermann J, Wiegand A, Kanzow P. Repair of partially defective restorations: Systematic review and meta-analysis of patient acceptance. J Dent. 2024;150:105361. PMID: 39312994 · DOI: 10.1016/j.jdent.2024.105361
  11. Mendes LT, Loomans BAC, Opdam NJM, Silva CLD, Casagrande L, Lenzi TL. Silane Coupling Agents are Beneficial for Resin Composite Repair: A Systematic Review and Meta-Analysis of In Vitro Studies. J Adhes Dent. 2020;22(5):443-453. PMID: 33073776 · DOI: 10.3290/j.jad.a45175
  12. Sekundo C, Frese C, Frankenberger R, Haak R, Braun A, Krämer N, et al. Direct Composite Restorations on Permanent Teeth in the Anterior and Posterior Region - An Evidence-Based Clinical Practice Guideline - Part 2: Recommendations for Composite Processing. J Adhes Dent. 2024;26:201-212. PMID: 39286911 · DOI: 10.3290/j.jad.b5749192
  13. Mendes LT, Pedrotti D, Casagrande L, Lenzi TL. Risk of failure of repaired versus replaced defective direct restorations in permanent teeth: a systematic review and meta-analysis. Clin Oral Investig. 2022;26(7):4917-4927. PMID: 35362754 · DOI: 10.1007/s00784-022-04459-0
  14. Hickel R, Mesinger S, Opdam N, Loomans B, Frankenberger R, Cadenaro M, et al. Revised FDI criteria for evaluating direct and indirect dental restorations-recommendations for its clinical use, interpretation, and reporting. Clin Oral Investig. 2023;27(6):2573-2592. PMID: 36504246 · DOI: 10.1007/s00784-022-04814-1

Methods note

The first search was run in PubMed on 4 November 2026; on 5 November 2026 every source was re-verified against its PubMed record (NCBI E-utilities), and new sources were added on surface preparation for repair, clinical performance of anterior restorations and the processing part of the S3 guideline. After an external reading on the same day, a primary meta-analysis of repair versus replacement and the revised FDI criteria were added as sources. The search covered survival and complications of direct composite veneers, repair versus replacement, surface preparation for repair, patient acceptance, long-term aesthetics and isolation. Systematic reviews, meta-analyses and guidelines were given priority. Author, title, journal, year and DOI of every source were checked against its PubMed record; findings were taken from abstracts only, and full texts were not read. This is not a systematic review; it was prepared from one database by one reader.

Author: Dr. Ferit Çiftçi · Dentist · Author page · Last updated: 5 November 2026

This text is not patient information. Treatment decisions are made after an examination and for each person individually.

Phone: +90 538 073 12 11